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Khan A, Singh AV, Kukreti B, Pandey DT, Upadhayay VK, Kumar R, Goel R. Deciphering the impact of cold-adapted bioinoculants on rhizosphere dynamics, biofortification, and yield of kidney bean across varied altitudinal zones. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 927:172204. [PMID: 38580128 DOI: 10.1016/j.scitotenv.2024.172204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 03/30/2024] [Accepted: 04/02/2024] [Indexed: 04/07/2024]
Abstract
Agriculture stands as a thriving enterprise in India, serving as both the bedrock of economy and vital source of nutrition. In response to the escalating demands for high-quality food for swiftly expanding population, agricultural endeavors are extending their reach into the elevated terrains of the Himalayas, tapping into abundant resources for bolstering food production. Nonetheless, these Himalayan agro-ecosystems encounter persistent challenges, leading to crop losses. These challenges stem from a combination of factors including prevailing frigid temperatures, suboptimal farming practices, unpredictable climatic shifts, subdivided land ownership, and limited resources. While the utilization of chemical fertilizers has been embraced to enhance the quality of food output, genuine concerns have arisen due to the potential hazards they pose. Consequently, the present investigation was initiated with the objective of formulating environmentally friendly and cold-tolerant broad ranged bioinoculants tailored to enhance the production of Kidney bean while concurrently enriching its nutrient content across entire hilly regions. The outcomes of this study unveiled noteworthy advancements in kidney bean yield, registering a substantial increase ranging from 12.51 ± 2.39 % to 14.15 ± 0.83 % in regions of lower elevation (Jeolikote) and an even more remarkable surge ranging from 20.60 ± 3.03 % to 29.97 ± 5.02 % in higher elevated areas (Chakrata) compared to the control group. Furthermore, these cold-tolerant bioinoculants exhibited a dual advantage by fostering the enhancement of essential nutrients within the grains and fostering a positive influence on the diversity and abundance of microbial life in the rhizosphere. As a result, to effectively tackle the issues associated with chemical fertilizers and to achieve sustainable improvements in both the yield and nutrient composition of kidney bean across varying elevations, the adoption of cold-tolerant Enterobacter hormaechei CHM16, and Pantoea agglomerans HRM 23, including the consortium, presents a promising avenue. Additionally, this study has contributed significant insights-into the role of organic acids like oxalic acid in the solubilization of nutrients, thereby expanding the existing knowledge in this specialized field.
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Affiliation(s)
- Amir Khan
- Biofortification Lab, Department of Microbiology, College of Basic Sciences and Humanities, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar-263145, U.S. Nagar, Uttarakhand, India
| | - Ajay Veer Singh
- Biofortification Lab, Department of Microbiology, College of Basic Sciences and Humanities, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar-263145, U.S. Nagar, Uttarakhand, India.
| | - Bharti Kukreti
- Biofortification Lab, Department of Microbiology, College of Basic Sciences and Humanities, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar-263145, U.S. Nagar, Uttarakhand, India
| | | | - Viabhav Kumar Upadhayay
- Department of Microbiology, College of Basic Sciences and Humanities, Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur 848125, India
| | - Rajeew Kumar
- Department of Agronomy, College of Agriculture, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar-263145, U.S. Nagar, Uttarakhand, India
| | - Reeta Goel
- Department of Biotechnology, Institute of Applied Sciences and Humanities, GLA University, Mathura, Uttar Pradesh, India
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2
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Deepa N, Chauhan S, Singh A. Unraveling the functional characteristics of endophytic bacterial diversity for plant growth promotion and enhanced secondary metabolite production in Pelargonium graveolens. Microbiol Res 2024; 283:127673. [PMID: 38484575 DOI: 10.1016/j.micres.2024.127673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 02/22/2024] [Accepted: 03/01/2024] [Indexed: 04/17/2024]
Abstract
The rich diversity of microbial endophytic communities associated with plants, often referred to as the second genome, serves as a compelling illustration of efficient co-evolution. This noteworthy partnership plays a pivotal role in sustaining plant well-being and enhancing plant adaptability across diverse habitats. Therefore, examining the diversity of endophytic microbes associated with their particular host plant is valuable for gaining insights into the vast spectrum of plant-microbe interactions. The present experiments aimed at investigating the bacterial endophytic diversity in both root and shoot tissues of Pelargonium graveolens, employing culture dependent and culture independent high-throughput metagenomics approach. A total of 614 and 620 operational taxonomic units (OTUs), encompassing 291 and 229 genera, were identified in the shoot and root tissues of P. graveolens, respectively. Furthermore, the subsequent classification of OTUs revealed 15 highly abundant phyla, with Proteobacteria dominating both root and shoot tissues. Notably, an exceptionally high abundance of Firmicutes phyla was observed in the shoot compared to the root. Additionally, 30 bacterial endophytes from the root, stem, petiole, and leaves were isolated and molecularly characterized, unveiling a consistent pattern of diversity distribution between the root and shoot of P. graveolens. Upon screening all isolates for plant growth promoting traits, Pseudomonas oryzihabitans was found to be positive for major biochemical test like nitrogen fixation, phosphate solubilization etc. and on inoculation resulted in about two-fold increase in content of essential oil accompanied by a significant rise in the geraniol and citronellol content. Diving deep into the genetic constitution of P. oryzihabitans unveiled a substantial number of genes directly and indirectly contributing to the endophyte's capability in colonizing host plants effectively. In summary, data obtained from metagenomics and culture dependent approaches including glass house trials suggest potential bacterial endophytes suitable for field applications for yield enhancement and in planta secondary metabolite enhancement investigations.
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Affiliation(s)
- Nikky Deepa
- Division of Crop Production and Protection, Central Institute of Medicinal and Aromatic Plants, Lucknow 226015, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Shivam Chauhan
- Division of Crop Production and Protection, Central Institute of Medicinal and Aromatic Plants, Lucknow 226015, India
| | - Akanksha Singh
- Division of Crop Production and Protection, Central Institute of Medicinal and Aromatic Plants, Lucknow 226015, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India.
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Vasanthkumar R, Baskar V, Vinoth S, Roshna K, Mary TN, Alagupandi R, Saravanan K, Radhakrishnan R, Arun M, Gurusaravanan P. Biogenic carbon quantum dots from marine endophytic fungi (Aspergillus flavus) to enhance the curcumin production and growth in Curcuma longa L. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 211:108644. [PMID: 38710114 DOI: 10.1016/j.plaphy.2024.108644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 04/03/2024] [Accepted: 04/17/2024] [Indexed: 05/08/2024]
Abstract
In this study, we have investigated the effect of carbon quantum dots (FM-CQDs) synthesized from marine fungal extract on Curcuma longa to improve the plant growth and curcumin production. The isolated fungus, Aspergillus flavus has produced a high amount of indole-3-acetic acid (IAA) (0.025 mg g-1), when treated with tryptophan. CQDs were synthesized from the A. flavus extract and it was characterized using ultraviolet visible spectrophotometer (UV-Vis) and high-resolution transmission electron microscopy (HR-TEM). The synthesized CQDs were excited at 365 nm in an UV-Vis and the HR-TEM analysis showed approximately 7.4 nm in size with a spherical shape. Both fungal crude extract (FCE) at 0-100 mg L-1 and FM-CQDs 0-5 mg L-1 concentrations were tested on C. longa. About 80 mg L-1 concentration FCE treated plants has shown a maximum height of 21 cm and FM-CQDs at 4 mg L-1 exhibited a maximum height of 25 cm compared to control. The FM-CQDs significantly increased the photosynthetic pigments such as total chlorophyll (1.08 mg g-1 FW) and carotenoids (17.32 mg g-1 FW) in C. longa. Further, antioxidant enzyme analysis confirmed that the optimum concentrations of both extracts did not have any toxic effects on the plants. FM-CQDs treated plants increased the curcumin content up to 0.060 mg g-1 by HPLC analysis. Semi quantitative analysis revealed that FCE and FM-CQDs significantly upregulated ClCURS1 gene expression in curcumin production.
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Affiliation(s)
- Rajkumar Vasanthkumar
- Plant Biotechnology Laboratory, Department of Botany, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India
| | - Venkidasamy Baskar
- Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, 600 077, India
| | - Sathasivam Vinoth
- Department of Biotechnology, Sona College of Arts and Science, Salem, 636 005, Tamil Nadu, India
| | - Kattilaparambil Roshna
- Plant Biotechnology Laboratory, Department of Botany, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India
| | - Thomas Nancy Mary
- Plant Biotechnology Laboratory, Department of Botany, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India
| | - Raman Alagupandi
- Plant Biotechnology Laboratory, Department of Botany, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India
| | - Krishnagowdu Saravanan
- Department of Biotechnology, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India
| | | | - Muthukrishnan Arun
- Department of Biotechnology, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India
| | - Packiaraj Gurusaravanan
- Plant Biotechnology Laboratory, Department of Botany, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India.
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Bashir I, War AF, Rafiq I, Reshi ZA, Rashid I, Shouche YS. Uncovering the secret weapons of an invasive plant: The endophytic microbes of Anthemis cotula. Heliyon 2024; 10:e29778. [PMID: 38694109 PMCID: PMC11058297 DOI: 10.1016/j.heliyon.2024.e29778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 04/13/2024] [Accepted: 04/15/2024] [Indexed: 05/03/2024] Open
Abstract
Understanding plant-microbe interaction can be useful in identifying the microbial drivers of plant invasions. It is in this context that we explored the diversity of endophytic microbes from leaves of Anthemis cotula, an annual plant that is highly invasive in Kashmir Himalaya. We also tried to establish the role of endophytes in the invasiveness of this alien species. We collected and processed leaf samples from three populations at three different sites. A total of 902 endophytic isolates belonging to 4 bacterial and 2 fungal phyla were recovered that belonged to 27 bacterial and 14 fungal genera. Firmicutes (29.1%), Proteobacteria (24.1%), Ascomycota (22.8%) and Actinobacteria (19%) were dominant across all samples. Plant growth promoting traits, such as Ammonia production, Indole Acetic Acid (IAA) production, Phosphate solubilization and biocontrol activity of these endophytes were also studied and most of the isolates (74.68%) were positive for ammonia production. IAA production, phosphate solubilization and biocontrol activity was present in 39.24%, 36.70% and 20.26% isolates, respectively. Furthermore, Botrytis cinerea, a pathogen of A. cotula in its native range, though present in Kashmir Himalaya does not affect A. cotula probably due to the presence of leaf endophytic microbial antagonists. Our results highlight that the beneficial plant growth promoting interactions and enemy suppression by leaf endophytes of A. cotula, may be contributing to its survival and invasion in the Kashmir Himalaya.
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Affiliation(s)
- Iqra Bashir
- Department of Botany, University of Kashmir, Srinagar, 190006, Jammu and Kashmir, India
| | - Aadil Farooq War
- Department of Botany, University of Kashmir, Srinagar, 190006, Jammu and Kashmir, India
| | - Iflah Rafiq
- Department of Botany, University of Kashmir, Srinagar, 190006, Jammu and Kashmir, India
| | - Zafar A. Reshi
- Department of Botany, University of Kashmir, Srinagar, 190006, Jammu and Kashmir, India
| | - Irfan Rashid
- Department of Botany, University of Kashmir, Srinagar, 190006, Jammu and Kashmir, India
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Aziz RA, Ramesh P, Suchithra KV, Stothard P, Narayana VK, Raghu SV, Shen FT, Young CC, Prasad TSK, Hameed A. Comprehensive insights into the impact of bacterial indole-3-acetic acid on sensory preferences in Drosophila melanogaster. Sci Rep 2024; 14:8311. [PMID: 38594449 PMCID: PMC11003987 DOI: 10.1038/s41598-024-58829-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 04/03/2024] [Indexed: 04/11/2024] Open
Abstract
Several bacteria of environmental and clinical origins, including some human-associated strains secrete a cross-kingdom signaling molecule indole-3-acetic acid (IAA). IAA is a tryptophan (trp) derivative mainly known for regulating plant growth and development as a hormone. However, the nutritional sources that boost IAA secretion in bacteria and the impact of secreted IAA on non-plant eukaryotic hosts remained less explored. Here, we demonstrate significant trp-dependent IAA production in Pseudomonas juntendi NEEL19 when provided with ethanol as a carbon source in liquid cultures. IAA was further characterized to modulate the odor discrimination, motility and survivability in Drosophila melanogaster. A detailed analysis of IAA-fed fly brain proteome using high-resolution mass spectrometry showed significant (fold change, ± 2; p ≤ 0.05) alteration in the proteins governing neuromuscular features, audio-visual perception and energy metabolism as compared to IAA-unfed controls. Sex-wise variations in differentially regulated proteins were witnessed despite having similar visible changes in chemo perception and psychomotor responses in IAA-fed flies. This study not only revealed ethanol-specific enhancement in trp-dependent IAA production in P. juntendi, but also showed marked behavioral alterations in flies for which variations in an array of proteins governing odor discrimination, psychomotor responses, and energy metabolism are held responsible. Our study provided novel insights into disruptive attributes of bacterial IAA that can potentially influence the eukaryotic gut-brain axis having broad environmental and clinical implications.
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Affiliation(s)
- Raifa Abdul Aziz
- Neurogenetics Lab, Department of Applied Zoology, Mangalore University, Mangalagangothri, Konaje, Mangalore, 574199, India
| | - Poornima Ramesh
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Deralakatte, Mangalore, 575018, India
| | - Kokkarambath Vannadil Suchithra
- Division of Microbiology and Biotechnology, Yenepoya Research Centre, Yenepoya (Deemed to Be University), Deralakatte, Mangalore, 575018, India
| | - Paul Stothard
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada
| | - Vanya Kadla Narayana
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Deralakatte, Mangalore, 575018, India
| | - Shamprasad Varija Raghu
- Neurogenetics Lab, Department of Applied Zoology, Mangalore University, Mangalagangothri, Konaje, Mangalore, 574199, India
- Division of Neuroscience, Yenepoya Research Centre, Yenepoya (Deemed to Be University), Deralakatte, Mangalore, 575018, India
| | - Fo-Ting Shen
- Department of Soil & Environmental Sciences, College of Agriculture and Natural Resources, National Chung Hsing University, Taichung, 402, Taiwan.
- Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung, 402, Taiwan.
| | - Chiu-Chung Young
- Department of Soil & Environmental Sciences, College of Agriculture and Natural Resources, National Chung Hsing University, Taichung, 402, Taiwan
- Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung, 402, Taiwan
| | - T S Keshava Prasad
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Deralakatte, Mangalore, 575018, India.
| | - Asif Hameed
- Division of Microbiology and Biotechnology, Yenepoya Research Centre, Yenepoya (Deemed to Be University), Deralakatte, Mangalore, 575018, India.
- Department of Soil & Environmental Sciences, College of Agriculture and Natural Resources, National Chung Hsing University, Taichung, 402, Taiwan.
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6
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Tsavkelova EA, Volynchikova EA, Potekhina NV, Lavrov KV, Avtukh AN. Auxin production and plant growth promotion by Microbacterium albopurpureum sp. nov. from the rhizoplane of leafless Chiloschista parishii Seidenf. orchid. FRONTIERS IN PLANT SCIENCE 2024; 15:1360828. [PMID: 38559760 PMCID: PMC10978784 DOI: 10.3389/fpls.2024.1360828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2023] [Accepted: 02/14/2024] [Indexed: 04/04/2024]
Abstract
The strains of the genus Microbacterium, with more than 150 species, inhabit diverse environments; plant-associated bacteria reveal their plant growth-promoting activities due to a number of beneficial characteristics. Through the performance of diverse techniques and methods, including isolation of a novel Microbacterium strain from the aerial roots of leafless epiphytic orchid, Chiloschista parishii Seidenf., its morphological and biochemical characterization, chemotaxonomy, phylogenetic and genome analysis, as well as bioassays and estimation of its auxin production capacity, a novel strain of ET2T is described. Despite that it shared 16S rRNA gene sequence similarity of 99.79% with Microbacterium kunmingense JXJ CY 27-2T, so they formed a monophyletic group on phylogenetic trees, the two strains showed clear divergence of their genome sequences. The average nucleotide identity (ANI), average amino acid identity (AAI) and digital DNA-DNA hybridization (dDDH) values of ET2T differed greatly from phylogenetically close JXJ CY 27-2T. Based on the differences being below the threshold for species similarity, together with the unique chemotaxonomic characteristics, strain ET2T represents a novel species of the genus Microbacterium. Several genes, putatively involved in auxin biosynthesis were predicted. This strain revealed obvious plant growth-promoting activities, including diazotrophy and biosynthesis of tryptophan-dependent auxins (indole-3-acetic and indole-3-pyruvic acids). Microbial auxins directly stimulated the rhizogenesis, so that the ET2T-inoculated seeds of wheat, cucumber and garden cress showed evident promotion in their growth and development, both under optimal and under cold stress conditions. Based on phenotypic, chemotypic and genotypic evidences, the strain ET2T belongs to the genus Microbacterium, order Micrococcales, class Actinomycetes, and it represents a novel species, for which the name Microbacterium albopurpureum sp. nov. is proposed, with strain ET2T (VKPM Ac-2212, VKM Ас-2998) as the type strain.
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Affiliation(s)
- Elena A. Tsavkelova
- Department of Biology, Shenzhen Moscow State University and Beijing Institute of Technology (MSU-BIT) University, Shenzhen, Guangdong, China
- Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia
| | | | | | - Konstantin V. Lavrov
- Genomic Center of National Research Centre (NRC) “Kurchatov Institute”, Moscow, Russia
| | - Alexander N. Avtukh
- Skryabin Institute of Biochemistry and Physiology of Microorganisms, Pushchino Scientific Center for Biological Research, Russian Academy of Sciences, Pushchino, Russia
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7
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Baylous HR, Gladfelter MF, Gardner MI, Foley M, Wilson AE, Steffen MM. Indole-3-acetic acid promotes growth in bloom-forming Microcystis via an antioxidant response. HARMFUL ALGAE 2024; 133:102575. [PMID: 38485434 DOI: 10.1016/j.hal.2024.102575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 01/05/2024] [Accepted: 01/05/2024] [Indexed: 03/19/2024]
Abstract
Interactions between bacteria and phytoplankton in the phycosphere facilitate and constrain biogeochemical cycling in aquatic ecosystems. Indole-3-acetic acid (IAA) is a bacterially produced chemical signal that promotes growth of phytoplankton and plants. Here, we explored the impact of IAA on bloom-forming cyanobacteria and their associated bacteria. Exposure to IAA and its precursor, tryptophan, resulted in a strong growth response in a bloom of the freshwater cyanobacterium, Microcystis. Metatranscriptome analysis revealed the induction of an antioxidant response in Microcystis upon exposure to IAA, potentially allowing populations to increase photosynthetic rate and overcome internally generated reactive oxygen. Our data reveal that co-occurring bacteria within the phycosphere microbiome exhibit a division of labor for supportive functions, such as nutrient mineralization and transport, vitamin synthesis, and reactive oxygen neutralization. These complex dynamics within the Microcystis phycosphere microbiome are an example of interactions within a microenvironment that can have ecosystem-scale consequences.
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Affiliation(s)
- Hunter R Baylous
- Department of Biology, James Madison University, Harrisonburg, VA 22801, USA
| | - Matthew F Gladfelter
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA
| | - Malia I Gardner
- Department of Biology, James Madison University, Harrisonburg, VA 22801, USA
| | - Madalynn Foley
- Department of Biology, James Madison University, Harrisonburg, VA 22801, USA
| | - Alan E Wilson
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA
| | - Morgan M Steffen
- Department of Biology, James Madison University, Harrisonburg, VA 22801, USA.
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Amaradasa BS, Mei C, He Y, Chretien RL, Doss M, Durham T, Lowman S. Biocontrol potential of endophytic Pseudomonas strain IALR1619 against two Pythium species in cucumber and hydroponic lettuce. PLoS One 2024; 19:e0298514. [PMID: 38408078 PMCID: PMC10896519 DOI: 10.1371/journal.pone.0298514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Accepted: 01/26/2024] [Indexed: 02/28/2024] Open
Abstract
The use of fungicides to manage disease has led to multiple environmental externalities, including resistance development, pollution, and non-target mortality. Growers have limited options as legacy chemistry is withdrawn from the market. Moreover, fungicides are generally labeled for traditional soil-based production, and not for liquid culture systems. Biocontrol agents for disease management are a more sustainable and environmentally friendly alternative to conventional agroprotectants. Pythium ultimum is a soil borne oomycete plant pathogen with a broad taxonomic host range exceeding 300 plants. Cucumber seedlings exposed to P. ultimum 1 day after a protective inoculation with bacterial endophyte accession IALR1619 (Pseudomonas sp.) recorded 59% survival; with the control assessed at 18%. When the pathogen was added 5 days post endophyte inoculation, 74% of the seedlings treated survived, compared to 36% of the control, indicating a longer-term effect of IALR1619. Under hydroponic conditions, IALR1619 treated leaf type lettuce cv. 'Cristabel' and Romaine cv. 'Red Rosie' showed 29% and 42% higher shoot fresh weight compared to their controls, respectively. Similar results with less growth decline were observed for a repeat experiment with IALR1619. Additionally, an experiment on hydroponic lettuce in pots with perlite was carried out with a mixture of P. ultimum and P. dissotocum after IALR1619 inoculation. The endophyte treated 'Cristabel' showed fresh weight gain, but the second cultivar 'Pensacola' yielded no increase. In summary, the endophyte IALR1619 provided short term as well as medium-term protection against Pythium blight in cucumber seedlings and may be used as an alternative to conventional fungicides in a greenhouse setting. This study also demonstrated the potential of ALR1619 as a biocontrol agent against Pythium blight in hydroponic lettuce.
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Affiliation(s)
- B Sajeewa Amaradasa
- The Institute for Advanced Learning and Research, The Plant Endophyte Research Center, Danville, VA, United States of America
| | - Chuansheng Mei
- The Institute for Advanced Learning and Research, The Plant Endophyte Research Center, Danville, VA, United States of America
| | - Yimeng He
- The Institute for Advanced Learning and Research, The Plant Endophyte Research Center, Danville, VA, United States of America
| | - Robert L Chretien
- The Institute for Advanced Learning and Research, The Plant Endophyte Research Center, Danville, VA, United States of America
| | - Mitchell Doss
- School of Plant and Environmental Sciences-Virginia Tech at The Institute for Advanced Learning and Research, Controlled Environment Agriculture Innovation Center, Danville, VA, United States of America
| | - Tim Durham
- Division of Science and Technology, Agriculture Program, School of Undergraduate Studies, Ferrum College, Ferrum, VA, United States of America
| | - Scott Lowman
- The Institute for Advanced Learning and Research, The Plant Endophyte Research Center, Danville, VA, United States of America
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Dolphen R, Thiravetyan P. Exogenous γ-aminobutyric acid and Bacillus pumilus reduce arsenic uptake and toxicity in rice. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:10609-10620. [PMID: 38198091 DOI: 10.1007/s11356-024-31893-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 01/03/2024] [Indexed: 01/11/2024]
Abstract
In this study, the addition of γ-aminobutyric acid (GABA), Bacillus pumilus, or both, was found to enhance rice growth and yield while significantly decreasing arsenic (As) accumulation in Oryza sativa rice tissues. GABA emerged as a regulator of iron (Fe) homeostasis, acting as a signaling modulator that influenced phytosiderophore secretions in the plant. Meanwhile, B. pumilus directly increased Fe levels through siderophore production, promoting the development of Fe-rich rice plants. Subsequently, Fe competed with As uptake at the root surface, leading to decreased As levels and translocation to the grains. Furthermore, the addition of GABA and B. pumilus optimized rice indole-3 acetic acid (IAA) contents, thereby adjusting cell metabolite balance under As stress. This adjustment results in low malondialdehyde (MDA) contents in the leaves and roots during the early and late vegetative phases, effectively reducing oxidative stress. When added to As-contaminated soil, GABA and B. pumilus effectively maintained endogenous GABA levels and exhibited low ROS generation, similar to normal soil. Concurrently, GABA and B. pumilus significantly downregulated the activity of OsLsi1, OsLsi2, and OsABCC1 in roots, reducing As uptake through roots, shoots, and grains, respectively. These findings suggest that GABA and B. pumilus additions impede As translocation through grains, ultimately enhancing rice productivity under As stress.
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Affiliation(s)
- Rujira Dolphen
- Pilot Plant Development and Training Institute, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand.
| | - Paitip Thiravetyan
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand
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10
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Van Gerrewey T, Navarrete O, Vandecruys M, Perneel M, Boon N, Geelen D. Bacterially enhanced plant-growing media for controlled environment agriculture. Microb Biotechnol 2024; 17:e14422. [PMID: 38380980 PMCID: PMC10880579 DOI: 10.1111/1751-7915.14422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 01/19/2024] [Accepted: 01/21/2024] [Indexed: 02/22/2024] Open
Abstract
Microbe-plant interactions in the root zone not only shape crop performance in soil but also in hydroponic cultivation systems. The biological and physicochemical properties of the plant-growing medium determine the root-associated microbial community and influence bacterial inoculation effectiveness, which affects plant growth. This study investigated the combined impact of plant-growing media composition and bacterial community inoculation on the root-associated bacterial community of hydroponically grown lettuce (Lactuca sativa L.). Ten plant-growing media were composed of varying raw materials, including black peat, white peat, coir pith, wood fibre, composted bark, green waste compost, perlite and sand. In addition, five different bacterial community inocula (BCI S1-5) were collected from the roots of lettuce obtained at different farms. After inoculation and cultivation inside a vertical farm, lettuce root-associated bacterial community structures, diversity and compositions were determined by evaluating 16S rRNA gene sequences. The study revealed distinct bacterial community structures among experimental replicates, highlighting the influence of raw material variations on root-associated bacterial communities, even at the batch level. However, bacterial community inoculation allowed modulation of the root-associated bacterial communities independently from the plant-growing medium composition. Bacterial diversity was identified as a key determinant of plant growth performance with green waste compost introducing Bacilli and Actinobacteria, and bacterial community inoculum S3 introducing Pseudomonas, which positively correlated with plant growth. These findings challenge the prevailing notion of hydroponic cultivation systems as sterile environments and highlight the significance of proper plant-growing media raw material selection and bacterial community inoculation in shaping root-associated microbiomes that provide stability through microbial diversity. This study supports the concept of creating bacterially enhanced plant-growing media to promote plant growth in controlled environment agriculture.
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Affiliation(s)
- Thijs Van Gerrewey
- HortiCell, Department of Plants and Crops, Faculty of Bioscience EngineeringGhent UniversityGentBelgium
- Center for Microbial Ecology and Technology (CMET), Department of Biotechnology, Faculty of Bioscience EngineeringGhent UniversityGentBelgium
- Urban Crop Solutions BVBAWaregemBelgium
- Agaris Belgium NVGentBelgium
| | | | | | - Maaike Perneel
- Cropfit, Faculty of Bioscience EngineeringGhent UniversityGentBelgium
| | - Nico Boon
- Center for Microbial Ecology and Technology (CMET), Department of Biotechnology, Faculty of Bioscience EngineeringGhent UniversityGentBelgium
| | - Danny Geelen
- HortiCell, Department of Plants and Crops, Faculty of Bioscience EngineeringGhent UniversityGentBelgium
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11
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Ai J, He X, Ren M, Yu T, Liu X, Jiang Y, Li Z, Deng Z. Kaistella yananensis sp. nov., a Novel Indoleacetic Acid-Producing Bacterium Isolated from the Root Nodules of Sophora davidii (Franch.) Skeels. Curr Microbiol 2024; 81:60. [PMID: 38206520 DOI: 10.1007/s00284-023-03578-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 12/01/2023] [Indexed: 01/12/2024]
Abstract
A novel endophytic bacterium, designated strain BT6-1-3T, was isolated from the root nodules of a leguminous shrub named Sophora davidii (Franch.) Skeels, found growing wild in Yan'an, Shaanxi Province, China. Cells were Gram-staining-negative, non-motile, catalase-positive, oxidase-positive, and did not produce H2S. Strain BT6-1-3T grew at 15-40 °C (optimum 30 °C), at pH 6.0-10.0 (optimum pH 9.0), and with 0-1% (w/v) NaCl (optimum 0.5%). The quinone system was menaquinone 6. The major fatty acids present in BT6-1-3T were iso-C11:0, iso-C15:0, and C16:0. The G+C content of genomic DNA was 39.4 mol% by whole genome sequencing. According to the analysis of 16S rRNA gene sequence, the closest relative was Kaistella montana WG4 (nucleotide identity was 97.6%). The genome of strain BT6-1-3T was sequenced, and the genome similarity was calculated using average nucleotide identity and genome-to-genome distance analysis with the genomes of other strains of Kaistella. Both strongly supported that the strain BT6-1-3T belonged to the genus Kaistella as a representative of a new species. Based on phylogenetic analysis, chemotaxonomic data, and physiological and biochemical characteristics, strain BT6-1-3T represents a new species of the genus Kaistella and is named as Kaistella yananensis sp. nov. Type strain is BT6-1-3T (= NBRC 115452T = CGMCC 1.60032T).
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Affiliation(s)
- Jiamin Ai
- College of Life Science, Northwest A&F University, Yangling, 712100, China
- College of Life Sciences, Yan'an University, Yan'an, 716000, China
| | - Xiaolong He
- College of Life Sciences, Yan'an University, Yan'an, 716000, China
| | - Mingxia Ren
- College of Life Sciences, Yan'an University, Yan'an, 716000, China
| | - Tianfei Yu
- College of Life Sciences, Yan'an University, Yan'an, 716000, China
| | - Xiaodong Liu
- College of Life Sciences, Yan'an University, Yan'an, 716000, China
| | - Yingying Jiang
- College of Life Sciences, Yan'an University, Yan'an, 716000, China
| | - Zhefei Li
- College of Life Science, Northwest A&F University, Yangling, 712100, China.
| | - Zhenshan Deng
- College of Life Sciences, Yan'an University, Yan'an, 716000, China.
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12
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Li Y, Chen Y, Fu Y, Shao J, Liu Y, Xuan W, Xu G, Zhang R. Signal communication during microbial modulation of root system architecture. JOURNAL OF EXPERIMENTAL BOTANY 2024; 75:526-537. [PMID: 37419655 DOI: 10.1093/jxb/erad263] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 07/06/2023] [Indexed: 07/09/2023]
Abstract
Every living organism on Earth depends on its interactions with other organisms. In the rhizosphere, plants and microorganisms constantly exchange signals and influence each other's behavior. Recent studies have shown that many beneficial rhizosphere microbes can produce specific signaling molecules that affect plant root architecture and therefore could have substantial effects on above-ground growth. This review examines these chemical signals and summarizes their mechanisms of action, with the aim of enhancing our understanding of plant-microbe interactions and providing references for the comprehensive development and utilization of these active components in agricultural production. In addition, we highlight future research directions and challenges, such as searching for microbial signals to induce primary root development.
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Affiliation(s)
- Yucong Li
- Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, Nanjing 210095, China
- College of Environment and Ecology, Jiangsu Open University, Nanjing 210017, China
| | - Yu Chen
- Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, Nanjing 210095, China
| | - Yansong Fu
- Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, Nanjing 210095, China
| | - Jiahui Shao
- Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, Nanjing 210095, China
| | - Yunpeng Liu
- State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Wei Xuan
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing 210095, China
| | - Guohua Xu
- State Key Laboratory of Crop Genetics and Germplasm Enhancement and MOA Key Laboratory of Plant Nutrition and Fertilization in Lower-Middle Reaches of the Yangtze River, Nanjing Agricultural University, Nanjing 210095, China
| | - Ruifu Zhang
- Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, Nanjing 210095, China
- State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
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13
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Vanacore MFG, Sartori M, Giordanino F, Barros G, Nesci A, García D. Physiological Effects of Microbial Biocontrol Agents in the Maize Phyllosphere. PLANTS (BASEL, SWITZERLAND) 2023; 12:4082. [PMID: 38140407 PMCID: PMC10747270 DOI: 10.3390/plants12244082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/29/2023] [Accepted: 12/01/2023] [Indexed: 12/24/2023]
Abstract
In a world with constant population growth, and in the context of climate change, the need to supply the demand of safe crops has stimulated an interest in ecological products that can increase agricultural productivity. This implies the use of beneficial organisms and natural products to improve crop performance and control pests and diseases, replacing chemical compounds that can affect the environment and human health. Microbial biological control agents (MBCAs) interact with pathogens directly or by inducing a physiological state of resistance in the plant. This involves several mechanisms, like interference with phytohormone pathways and priming defensive compounds. In Argentina, one of the world's main maize exporters, yield is restricted by several limitations, including foliar diseases such as common rust and northern corn leaf blight (NCLB). Here, we discuss the impact of pathogen infection on important food crops and MBCA interactions with the plant's immune system, and its biochemical indicators such as phytohormones, reactive oxygen species, phenolic compounds and lytic enzymes, focused mainly on the maize-NCLB pathosystem. MBCA could be integrated into disease management as a mechanism to improve the plant's inducible defences against foliar diseases. However, there is still much to elucidate regarding plant responses when exposed to hemibiotrophic pathogens.
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Affiliation(s)
- María Fiamma Grossi Vanacore
- PHD Student Laboratorio de Ecología Microbiana, Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 km 601, Río Cuarto 5800, Córdoba, Argentina;
| | - Melina Sartori
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Laboratorio de Ecología Microbiana, Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 km 601, Río Cuarto 5800, Córdoba, Argentina; (M.S.); (G.B.); (A.N.)
| | - Francisco Giordanino
- Microbiology Student Laboratorio de Ecología Microbiana, Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 km 601, Río Cuarto 5800, Córdoba, Argentina;
| | - Germán Barros
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Laboratorio de Ecología Microbiana, Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 km 601, Río Cuarto 5800, Córdoba, Argentina; (M.S.); (G.B.); (A.N.)
| | - Andrea Nesci
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Laboratorio de Ecología Microbiana, Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 km 601, Río Cuarto 5800, Córdoba, Argentina; (M.S.); (G.B.); (A.N.)
| | - Daiana García
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Laboratorio de Ecología Microbiana, Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 km 601, Río Cuarto 5800, Córdoba, Argentina; (M.S.); (G.B.); (A.N.)
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14
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Agha SI, Ullah M, Khan A, Jahan N, ullah SM, Tabassum B, Parveen S, Rehmat Z, Hussain A, Ahmed S, Hamid Hamdard M. Biocontrol rhizobacteria enhances growth and yield of wheat ( Triticum aestivum) under field conditions against Fusarium oxysporum. Bioengineered 2023; 14:2260923. [PMID: 37791524 PMCID: PMC10552572 DOI: 10.1080/21655979.2023.2260923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 01/12/2023] [Indexed: 10/05/2023] Open
Abstract
The current study aimed to identify the survival of bio-control bacteria with antifungal activity against Fusarium oxysporum and assess their growth promoting activity in wheat crop field conditions. To evaluate the fungicidal activities of isolated bacteria using the dual culture method, both qualitative and quantitative bioassays were performed. Plant Growth Promoting activities such as Indole 3-Acetic Acid (IAA), phosphate solubilization, Hydrogen cyanide (HCN), and Siderophore production were assessed for three biocontrol bacterial isolates (BCB 07, BCB16, and BCB 83) out of 180 with 70% antagonistic activity against Fusarium oxysporum. Chitinase, protease, and cellulase interaction in isolates was also tested. BCB16 was selected as it had 70% antagonist activity against F. oxysporum but also had the highest PGPR (Plant Growth Promoting Rhizobacteria) traits when compared to the other two isolates. BCB16 was also tested for survival in talc powder and in wheat crop field conditions. Even after 4 months in talc powder, the survival rate remained stable. In a wheat crop field, BCB16 reduced the disease incidence of Fusarium oxysporum by 54.38%. When compared to fungus alone treatment, BCB16 increased average yield by 57% alone and 32% in challenged conditions. BCB16 was identified molecularly using the 16s rRNA gene. Bacillus amyloliquefaciens shared 97% of the deduced sequence. The sequence was submitted to genbank and assigned the accession number OM333889. Bacillus amyloliquefaciens has the potential to be used in the field as an alternative to synthetic fungicides against Fusarium oxysporum.
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Affiliation(s)
- Syed Inayatullah Agha
- Department of Biotechnology, Balochistan University of Information Technology, Quetta, Pakistan
| | - Maghfoor Ullah
- Department of Biotechnology, Balochistan University of Information Technology, Quetta, Pakistan
| | - Anwar Khan
- Department of Microbiology, Balochistan University of Information Technology, Quetta, Pakistan
| | - Nusrat Jahan
- Department of Biotechnology, Balochistan University of Information Technology, Quetta, Pakistan
| | - Syed Moeez ullah
- Department of Biotechnology, Balochistan University of Information Technology, Quetta, Pakistan
| | - Bushra Tabassum
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan
| | - Samia Parveen
- Department of Microbiology, Balochistan University of Information Technology, Quetta, Pakistan
| | | | - Abrar Hussain
- Department of Biotechnology, Balochistan University of Information Technology, Quetta, Pakistan
| | - Sagheer Ahmed
- Shifa College of Pharmaceutical Sciences, Shifa Tameer-e-Millat University, Islamabad, Pakistan
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15
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Kudo H, Han N, Yokoyama D, Matsumoto T, Chien MF, Kikuchi J, Inoue C. Bayesian network highlights the contributing factors for efficient arsenic phytoextraction by Pteris vittata in a contaminated field. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 899:165654. [PMID: 37478955 DOI: 10.1016/j.scitotenv.2023.165654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 07/17/2023] [Accepted: 07/17/2023] [Indexed: 07/23/2023]
Abstract
Phytoextraction is a low-cost and eco-friendly method for removing pollutants, such as arsenic (As), from contaminated soil. One of the most studied As hyperaccumulators for soil remediation include Pteris vittata. Although phytoextraction using plant-assisted microbes has been considered a promising soil remediation method, microbial harnessing has not been achieved due to the complex and difficult to understand interactions between microbes and plants. This problem can possibly be addressed with a multi-omics approach using a Bayesian network. However, limited studies have used Bayesian networks to analyze plant-microbe interactions. Therefore, to understand this complex interaction and to facilitate efficient As phytoextraction using microbial inoculants, we conducted field cultivation experiments at two sites with different total As contents (62 and 8.9 mg/kg). Metabolome and microbiome data were obtained from rhizosphere soil samples using nuclear magnetic resonance and high-throughput sequencing, respectively, and a Bayesian network was applied to the obtained multi-omics data. In a highly As-contaminated site, inoculation with Pseudomonas sp. strain m307, which is an arsenite-oxidizing microbe having multiple copies of the arsenite oxidase gene, increased As concentration in the shoots of P. vittata to 157.5 mg/kg under this treatment; this was 1.5-fold higher than that of the other treatments. Bayesian network demonstrated that strain m307 contributed to As accumulation in P. vittata. Furthermore, the network showed that microbes belonging to the MND1 order positively contributed to As accumulation in P. vittata. Based on the ecological characteristics of MND1, it was suggested that the rhizosphere of P. vittata inoculated with strain m307 was under low-nitrogen conditions. Strain m307 may have induced low-nitrogen conditions via arsenite oxidation accompanied by nitrate reduction, potentially resulting in microbial iron reduction or the prevention of microbial iron oxidation. These conditions may have enhanced the bioavailability of arsenate, leading to increased As accumulation in P. vittata.
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Affiliation(s)
- Hiroshi Kudo
- Graduate School of Environmental Studies, Tohoku University, 6-6-20 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
| | - Ning Han
- Graduate School of Environmental Studies, Tohoku University, 6-6-20 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
| | - Daiki Yokoyama
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan.; Graduate School of Medical Life Science, Yokohama City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Tomoko Matsumoto
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Mei-Fang Chien
- Graduate School of Environmental Studies, Tohoku University, 6-6-20 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
| | - Jun Kikuchi
- RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan.; Graduate School of Medical Life Science, Yokohama City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan; Graduate School of Bioagricultural Sciences, Nagoya University, 1 Furo-cho, Chikusa-ku, Nagoya, Aichi 464-0810, Japan
| | - Chihiro Inoue
- Graduate School of Environmental Studies, Tohoku University, 6-6-20 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
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16
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Vanama S, Gopalan NSR, Pesari M, Baskar M, Gali UD, Lakshmi DL, Koteshwar P, Jesudasu G, Rathod S, Prasad MS, Panuganti R, Sundaram RM, Mohapatra S, Kannan C. Native bio-control agents from the rice fields of Telangana, India: characterization and unveiling the potential against stem rot and false smut diseases of rice. World J Microbiol Biotechnol 2023; 40:2. [PMID: 37923802 DOI: 10.1007/s11274-023-03782-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Accepted: 09/28/2023] [Indexed: 11/06/2023]
Abstract
The stem rot caused by Sclerotium hydrophilum and false smut caused by Ustilaginoidea virens are two of the major production constraints in rice cultivation in India and other countries. Stem rot and false smut can be effectively controlled with synthetic fungicides. However, the indiscriminate use of chemical fungicides may cause development of resistance among the pathogens. In addition to this, synthetic fungicides also exhibit harmful impacts on the environment. Exploiting microbe-based alternatives for managing plant diseases diminishes public concerns about the ill effects of pesticide usage in crops. In this regard, the present study was designed to investigate the potential of native microbial biocontrol agents (BCAs) from rice rhizosphere for the sustainable management of stem rot and false smut diseases in rice. Potential BCAs and pathogens were identified and characterized through morphological, biochemical, and sanger sequencing techniques. Bio-efficacy tests of potential BCAs against stem rot and false smut diseases on rice under glasshouse conditions indicated higher seed vigour index of the treated seeds, significant improvement in the growth of the seedling, increased dry weight, reduction in percentage disease index viz., 70.03% (stem rot) and 69.24% (false smut) over the control plants. Phytohormones indole acetic acid (IAA), abscisic acid (ABA), gibberellic acid (GA), salicylic acid (SA), and zeatin (tZ) were detected and quantified in the four potential BCAs using liquid chromatography- tandem mass spectrometry (LC-MS/MS). Scanning electron microscopy (SEM) studies revealed the endophytic nature of the strains in rice. The study indicated a positive correlation between the diversity and concentration of phytohormones released by the bioagents and enhanced plant growth promotion and disease suppression in rice.
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Affiliation(s)
- Sowmya Vanama
- Professor Jayashankar, Telangana State Agricultural University, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - N S Raja Gopalan
- Birla Institute of Technology and Science Pilani, Hyderabad Campus, Secunderabad, Telangana, 500078, India
| | - Maruthi Pesari
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - M Baskar
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - Uma Devi Gali
- Professor Jayashankar, Telangana State Agricultural University, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - D Ladha Lakshmi
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - P Koteshwar
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - G Jesudasu
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - Santosha Rathod
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - M Srinivas Prasad
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - Rajanikanth Panuganti
- Professor Jayashankar, Telangana State Agricultural University, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - R M Sundaram
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India
| | - Sridev Mohapatra
- Birla Institute of Technology and Science Pilani, Hyderabad Campus, Secunderabad, Telangana, 500078, India
| | - C Kannan
- ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, Telangana, 500030, India.
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17
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Alcalde MA, Hidalgo-Martinez D, Bru Martínez R, Sellés-Marchart S, Bonfill M, Palazon J. Insights into enhancing Centella asiatica organ cell biofactories via hairy root protein profiling. FRONTIERS IN PLANT SCIENCE 2023; 14:1274767. [PMID: 37965024 PMCID: PMC10642384 DOI: 10.3389/fpls.2023.1274767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 10/02/2023] [Indexed: 11/16/2023]
Abstract
Recent advancements in plant biotechnology have highlighted the potential of hairy roots as a biotechnological platform, primarily due to their rapid growth and ability to produce specialized metabolites. This study aimed to delve deeper into hairy root development in C. asiatica and explore the optimization of genetic transformation for enhanced bioactive compound production. Previously established hairy root lines of C. asiatica were categorized based on their centelloside production capacity into HIGH, MID, or LOW groups. These lines were then subjected to a meticulous label-free proteomic analysis to identify and quantify proteins. Subsequent multivariate and protein network analyses were conducted to discern proteome differences and commonalities. Additionally, the quantification of rol gene copy numbers was undertaken using qPCR, followed by gene expression measurements. From the proteomic analysis, 213 proteins were identified. Distinct proteome differences, especially between the LOW line and other lines, were observed. Key proteins related to essential processes like photosynthesis and specialized metabolism were identified. Notably, potential biomarkers, such as the Tr-type G domain-containing protein and alcohol dehydrogenase, were found in the HIGH group. The presence of ornithine cyclodeaminase in the hairy roots emerged as a significant biomarker linked with centelloside production capacity lines, indicating successful Rhizobium-mediated genetic transformation. However, qPCR results showed an inconsistency with rol gene expression levels, with the HIGH line displaying notably higher expression, particularly of the rolD gene. The study unveiled the importance of ornithine cyclodeaminase as a traceable biomarker for centelloside production capacity. The strong correlation between this biomarker and the rolD gene emphasizes its potential role in optimizing genetic transformation processes in C. asiatica.
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Affiliation(s)
- Miguel Angel Alcalde
- Biotechnology, Health and Education Research Group, Posgraduate School, Cesar Vallejo University, Trujillo, Peru
- Department of Biology, Healthcare and the Environment, Faculty of Pharmacy and Food Sciences, University of Barcelona, Barcelona, Spain
| | - Diego Hidalgo-Martinez
- Department of Biology, Healthcare and the Environment, Faculty of Pharmacy and Food Sciences, University of Barcelona, Barcelona, Spain
| | - Roque Bru Martínez
- Plant Proteomics and Functional Genomics Group, Department of Biochemistry and Molecular Biology, Soil Science and Agricultural Chemistry, Faculty of Science, University of Alicante, Alicante, Spain
| | - Susana Sellés-Marchart
- Plant Proteomics and Functional Genomics Group, Department of Biochemistry and Molecular Biology, Soil Science and Agricultural Chemistry, Faculty of Science, University of Alicante, Alicante, Spain
| | - Mercedes Bonfill
- Department of Biology, Healthcare and the Environment, Faculty of Pharmacy and Food Sciences, University of Barcelona, Barcelona, Spain
| | - Javier Palazon
- Department of Biology, Healthcare and the Environment, Faculty of Pharmacy and Food Sciences, University of Barcelona, Barcelona, Spain
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18
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Niu H, Nie Z, Long Y, Guo J, Tan J, Bi J, Yang H. Efficient pyridine biodegradation by Stenotrophomonas maltophilia J2: Degradation performance, mechanism, and immobilized application for wastewater. JOURNAL OF HAZARDOUS MATERIALS 2023; 459:132220. [PMID: 37549577 DOI: 10.1016/j.jhazmat.2023.132220] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 07/21/2023] [Accepted: 08/02/2023] [Indexed: 08/09/2023]
Abstract
Stenotrophomonas maltophilia J2, a highly efficient pyridine-degrading bacterium, was isolated from the aerobic tank of a pesticide-contaminated wastewater treatment plant. The strain J2 demonstrated an impressive pyridine degradation rate of 98.34% ± 0.49% within 72 h, at a pyridine concentration of 1100 mg·L-1, a temperature of 30 °C, a pH of 8.0, and a NaCl concentration of 0.5%. Notably, two new pyridine metabolic intermediates, 1,3-dihydroxyacetone and butyric acid, were discovered, indicating that J2 may degrade pyridine through two distinct metabolic pathways. Furthermore, the immobilized strain J2 was obtained by immobilizing J2 with biochar derived from the stem of Solidago canadensis L. In the pyridine-contaminated wastewater bioremediation experiment, the immobilized strain J2 was able to remove 2000 mg·L-1 pyridine with a 98.66% ± 0.47% degradation rate in 24 h, which was significantly higher than that of the control group (3.17% ± 1.24%), and remained above 90% in subsequent cycles until the 27th cycle. High-throughput sequencing analysis indicated that the J2 +B group had an elevated relative abundance of bacteria and functional genes that could be associated with the degradation of pyridine. The results offer a foundation for the effective use of immobilized strain in the treatment of recalcitrant pyridine-contaminated wastewater.
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Affiliation(s)
- Hongyu Niu
- College of Resources and Environment, Hunan Agricultural University, 410128 Changsha, China
| | - Zimeng Nie
- School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Yu Long
- College of Resources and Environment, Hunan Agricultural University, 410128 Changsha, China
| | - Jiayuan Guo
- College of Resources and Environment, Hunan Agricultural University, 410128 Changsha, China
| | - Ju Tan
- Changsha Ecological Monitoring Center of Hunan Province, 410001 Changsha, China
| | - Junping Bi
- Changsha Environmental Protection College, 410001 Changsha, China
| | - Haijun Yang
- College of Resources and Environment, Hunan Agricultural University, 410128 Changsha, China.
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Xue Y, Zhang Y, Huang K, Wang X, Xing M, Xu Q, Guo Y. A novel biocontrol agent Bacillus velezensis K01 for management of gray mold caused by Botrytis cinerea. AMB Express 2023; 13:91. [PMID: 37642883 PMCID: PMC10465465 DOI: 10.1186/s13568-023-01596-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 08/12/2023] [Indexed: 08/31/2023] Open
Abstract
Gray mold is a destructive plant disease caused by a fungal pathogen Botrytis cinerea. The use of plant growth promoting rhizobacteria (PGPR) has proven to be a promising method to control this disease. Bacillus velezensis K01 was isolated from the rhizosphere of planting tomatoes. Strain K01 has a range of roles, including the ability to solubilize phytate phosphorus, stimulate resistant response, and produce indoleacetic acid (IAA), protease, cellulase, and antimicrobial substances. Strain K01 was found to inhibit 12 phytopathogenic fungi and 5 phytopathogenic bacteria. Specially, strain K01 demonstrated a biocontrol efficiency of over 78% against gray mold caused by B. cinerea on the leaves and fruits of tomato and pepper. Additionally, K01 was found to promote the growth of maize seedlings. Further genomic analysis revealed that K01 belongs to B. velezensis, which is consistent with phylogenetic analysis, average nucleotide polymorphism (ANI), and digital DNA-DNA hybridization (dDDH). The genome of strain K01 had a size of 3,927,799 bp and deduced 3866 predicted genes, with an average guanine-cytosine (GC) content of 46.5%. Based on the analyses of genomic secondary metabolites, over 18.4% of the genome was annotated to 12 gene clusters related to antimicrobial metabolite synthesis. Additionally, genome annotation and comparative genomics identified several genes associated with plant growth promotion and environmental adaption. These findings suggest that B. velezensis K01 has the potential to serve as a new biocontrol agent for management of gray mold on tomato and pepper.
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Affiliation(s)
- Yinting Xue
- College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China
| | - Yunge Zhang
- Hebei Innovation Center of Biofertilizer Technology, Xingtai, Hebei, 054700, China
| | - Kun Huang
- Hebei Innovation Center of Biofertilizer Technology, Xingtai, Hebei, 054700, China
| | - Xiuyan Wang
- Hebei Innovation Center of Biofertilizer Technology, Xingtai, Hebei, 054700, China
| | - Mingzhen Xing
- Hebei Innovation Center of Biofertilizer Technology, Xingtai, Hebei, 054700, China
| | - Qiaolin Xu
- College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China
| | - Yanbin Guo
- College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China.
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20
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Alghamdi AK, Parween S, Hirt H, Saad MM. Complete genome sequence analysis of plant growth-promoting bacterium, Isoptericola sp. AK164 isolated from the rhizosphere of Avicennia marina growing at the Red Sea coast. Arch Microbiol 2023; 205:307. [PMID: 37580455 PMCID: PMC10425560 DOI: 10.1007/s00203-023-03654-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 08/06/2023] [Accepted: 08/08/2023] [Indexed: 08/16/2023]
Abstract
Isoptericola sp. AK164 is a Gram-positive, aerobic bacterial genus from the family Promicromonosporaceae, isolated from the root rhizosphere of Avicennia marina. AK164 significantly enhanced the growth of the Arabidopsis thaliana plant under normal and saline conditions. These bacteria can produce ACC deaminase and several enzymes playing a role in carbohydrate hydrolyses, such as cellulose, hemicellulose, and chitin degradation, which may contribute to plant growth, salt tolerance, and stress elevation. The genome sequence AK164 has a single circular chromosome of approximately 3.57 Mbp with a GC content of 73.53%. A whole genome sequence comparison of AK164 with type strains from the same genus, using digital DNA-DNA hybridization and average nucleotide identity calculations, revealed that AK164 might potentially belong to a new species of Isoptericola. Genome data and biochemical analyses indicate that AK164 could be a potential biostimulant for improving agriculture in submerged saline land.
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Affiliation(s)
- Amal Khalaf Alghamdi
- DARWIN21, Center for Desert Agriculture (CDA), Biological and Environmental Science and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Sabiha Parween
- DARWIN21, Center for Desert Agriculture (CDA), Biological and Environmental Science and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Heribert Hirt
- DARWIN21, Center for Desert Agriculture (CDA), Biological and Environmental Science and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Maged M Saad
- DARWIN21, Center for Desert Agriculture (CDA), Biological and Environmental Science and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia.
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21
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Oleńska E, Małek W, Wójcik M, Szopa S, Swiecicka I, Aleksandrowicz O, Włostowski T, Zawadzka W, Sillen WMA, Vangronsveld J, Cholakova I, Langill T, Thijs S. Bacteria associated with Zn-hyperaccumulators Arabidopsis halleri and Arabidopsis arenosa from Zn-Pb-Cd waste heaps in Poland as promising tools for bioremediation. Sci Rep 2023; 13:12606. [PMID: 37537323 PMCID: PMC10400580 DOI: 10.1038/s41598-023-39852-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 08/01/2023] [Indexed: 08/05/2023] Open
Abstract
To identify metal adapted bacteria equipped with traits positively influencing the growth of two hyperaccumulator plant species Arabidopsis arenosa and Arabidopsis halleri, we isolated bacteria inhabiting rhizosphere and vegetative tissues (roots, basal and stem leaves) of plants growing on two old Zn-Pb-Cd waste heaps in Bolesław and Bukowno (S. Poland), and characterized their potential plant growth promoting (PGP) traits as well as determined metal concentrations in rhizosphere and plant tissues. To determine taxonomic position of 144 bacterial isolates, 16S rDNA Sanger sequencing was used. A metabolic characterization of isolated strains was performed in vitro using PGP tests. A. arenosa and A. halleri accumulate high amounts of Zn in their tissues, especially in stem leaves. Among in total 22 identified bacterial taxa, the highest level of the taxonomical diversity (H' = 2.01) was revealed in A. halleri basal leaf endophytes originating from Bukowno waste heap area. The 96, 98, 99, and 98% of investigated strains showed tolerant to Cd, Zn, Pb and Cu, respectively. Generally, higher percentages of bacteria could synthesize auxins, siderophores, and acetoin as well as could solubilize phosphate. Nine of waste heap origin bacterial strains were tolerant to toxic metals, showed in vitro PGP traits and are potential candidates for bioremediation.
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Affiliation(s)
- Ewa Oleńska
- Faculty of Biology, University of Bialystok, 1J Ciołkowski, 15-245, Bialystok, Poland.
| | - Wanda Małek
- Faculty of Biology and Biotechnology, Institute of Biological Sciences, Maria Curie-Skłodowska University, 19 Akademicka, 20-033, Lublin, Poland
| | - Małgorzata Wójcik
- Faculty of Biology and Biotechnology, Institute of Biological Sciences, Maria Curie-Skłodowska University, 19 Akademicka, 20-033, Lublin, Poland
| | - Sebastian Szopa
- SHIM-POL A.M. Borzymowski, 5 Lubomirski, 05-080, Izabelin, Poland
| | - Izabela Swiecicka
- Faculty of Biology, University of Bialystok, 1J Ciołkowski, 15-245, Bialystok, Poland
- Laboratory of Applied Microbiology, University of Bialystok, 1J Ciołkowski, 15-245, Bialystok, Poland
| | | | - Tadeusz Włostowski
- Faculty of Biology, University of Bialystok, 1J Ciołkowski, 15-245, Bialystok, Poland
| | - Weronika Zawadzka
- Faculty of Biology, University of Bialystok, 1J Ciołkowski, 15-245, Bialystok, Poland
| | - Wouter M A Sillen
- Faculty of Environmental Biology, Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, 3590, Diepenbeek, Belgium
| | - Jaco Vangronsveld
- Faculty of Biology and Biotechnology, Institute of Biological Sciences, Maria Curie-Skłodowska University, 19 Akademicka, 20-033, Lublin, Poland
- Faculty of Environmental Biology, Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, 3590, Diepenbeek, Belgium
| | - Iva Cholakova
- Faculty of Environmental Biology, Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, 3590, Diepenbeek, Belgium
| | - Tori Langill
- Faculty of Environmental Biology, Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, 3590, Diepenbeek, Belgium
| | - Sofie Thijs
- Faculty of Environmental Biology, Centre for Environmental Sciences, Hasselt University, Agoralaan Building D, 3590, Diepenbeek, Belgium
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22
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Li Y, Wei S, Chen X, Dong Y, Zeng M, Yan C, Hou L, Jiao R. Isolation of cadmium-resistance and siderophore-producing endophytic bacteria and their potential use for soil cadmium remediation. Heliyon 2023; 9:e17661. [PMID: 37539295 PMCID: PMC10395048 DOI: 10.1016/j.heliyon.2023.e17661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 06/12/2023] [Accepted: 06/25/2023] [Indexed: 08/05/2023] Open
Abstract
Endophyte-assisted phytoremediation is an emerging technique for soil heavy metals (HMs) remediation and has become a research focus in the world because of the benefits of endophytes on plant growth and uptake of HMs. In this study, multifunctional endophytic bacteria strains were isolated and screened, and the feasibility of these strains for soil cadmium (Cd) remediation was investigated by soil incubation experiments and pot experiments. All endophytic bacteria were isolated from the roots of woody plants grown on Cd-contaminated soil. Seven endophytic bacteria strains had capacities to tolerate Cd toxicity and produce siderophores, and sequence analysis of the 16S rRNA gene classified these strains as belonging to the genera Burkholderia, Pseudomonas, Pantoea, and Herbaspirillum. All strains were able to produce hydroxamate siderophores (32.40%-91.49%) and had three or more plant growth promoting properties such as phosphorus solubilization, nitrogen fixation, indole acetic acid and 1-aminocyclopropane-1-carboxylate deaminase production. They were all strongly resistant to Cd2+ toxicity, with the minimum inhibitory concentration in LB medium ranging from 1.5 mM to 9.0 mM. Except for strain Burkholderia contaminans JLS17, other strains showed decreasing removal rates within continuously elevated Cd2+ concentration of 10-100 mg L-1. Compared with the uninoculated treatment, the inoculation of strains B.contaminans JLS17, Pseudomonas lurida JLS32, and Pantoea endophytica JLS50 effectively increased the concentration of acid-soluble Cd and decreased the concentration of reducible, oxidizable, and residual Cd in the soils of different Cd contamination levels. In pot experiments, inoculation of strains JLS17 and YTG72 significantly (p < 0.05) promoted the growth of above-ground parts and root system of slash pine (Pinus elliottii) under Cd stress. This study provides a valuable biological resource for endophyte-assisted phytoremediation and a theoretical basis for the application of endophytic bacteria for remediation of Cd-contaminated soil.
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Affiliation(s)
- Yanglong Li
- Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
- State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing 100091, China
- Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Chinese Academy of Forestry, Beijing 100091, China
| | - Shumeng Wei
- Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
- State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing 100091, China
- Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Chinese Academy of Forestry, Beijing 100091, China
| | - Xiangteng Chen
- Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
- State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing 100091, China
- Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Chinese Academy of Forestry, Beijing 100091, China
| | - Yuhong Dong
- Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
- State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing 100091, China
- Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Chinese Academy of Forestry, Beijing 100091, China
| | - Mansheng Zeng
- Experimental Center of Subtropical Forestry, Chinese Academy of Forestry, Fenyi 336600, China
| | - Chaowu Yan
- Forestry Bureau of Xinyu City, Jiangxi Province, Xinyu 338000, China
| | - Lingyu Hou
- Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
- State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing 100091, China
- Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Chinese Academy of Forestry, Beijing 100091, China
| | - Ruzhen Jiao
- Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
- State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing 100091, China
- Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Chinese Academy of Forestry, Beijing 100091, China
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23
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Aloo BN, Dessureault-Rompré J, Tripathi V, Nyongesa BO, Were BA. Signaling and crosstalk of rhizobacterial and plant hormones that mediate abiotic stress tolerance in plants. Front Microbiol 2023; 14:1171104. [PMID: 37455718 PMCID: PMC10347528 DOI: 10.3389/fmicb.2023.1171104] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 06/15/2023] [Indexed: 07/18/2023] Open
Abstract
Agricultural areas exhibiting numerous abiotic stressors, such as elevated water stress, temperatures, and salinity, have grown as a result of climate change. As such, abiotic stresses are some of the most pressing issues in contemporary agricultural production. Understanding plant responses to abiotic stressors is important for global food security, climate change adaptation, and improving crop resilience for sustainable agriculture, Over the decades, explorations have been made concerning plant tolerance to these environmental stresses. Plant growth-promoting rhizobacteria (PGPR) and their phytohormones are some of the players involved in developing resistance to abiotic stress in plants. Several studies have investigated the part of phytohormones in the ability of plants to withstand and adapt to non-living environmental factors, but very few have focused on rhizobacterial hormonal signaling and crosstalk that mediate abiotic stress tolerance in plants. The main objective of this review is to evaluate the functions of PGPR phytohormones in plant abiotic stress tolerance and outline the current research on rhizobacterial hormonal communication and crosstalk that govern plant abiotic stress responses. The review also includes the gene networks and regulation under diverse abiotic stressors. The review is important for understanding plant responses to abiotic stresses using PGPR phytohormones and hormonal signaling. It is envisaged that PGPR offer a useful approach to increasing plant tolerance to various abiotic stresses. However, further studies can reveal the unclear patterns of hormonal interactions between plants and rhizobacteria that mediate abiotic stress tolerance.
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Affiliation(s)
- B. N. Aloo
- Department of Biological Sciences, University of Eldoret, Eldoret, Kenya
| | | | - V. Tripathi
- Department of Biotechnology, Graphic Era (Deemed to be University), Dehradun, Uttarakhand, India
| | - B. O. Nyongesa
- Department of Biological Sciences, University of Eldoret, Eldoret, Kenya
| | - B. A. Were
- Department of Biological Sciences, University of Eldoret, Eldoret, Kenya
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24
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Zboralski A, Filion M. Pseudomonas spp. can help plants face climate change. Front Microbiol 2023; 14:1198131. [PMID: 37426009 PMCID: PMC10326438 DOI: 10.3389/fmicb.2023.1198131] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 06/09/2023] [Indexed: 07/11/2023] Open
Abstract
Climate change is increasingly affecting agriculture through droughts, high salinity in soils, heatwaves, and floodings, which put intense pressure on crops. This results in yield losses, leading to food insecurity in the most affected regions. Multiple plant-beneficial bacteria belonging to the genus Pseudomonas have been shown to improve plant tolerance to these stresses. Various mechanisms are involved, including alteration of the plant ethylene levels, direct phytohormone production, emission of volatile organic compounds, reinforcement of the root apoplast barriers, and exopolysaccharide biosynthesis. In this review, we summarize the effects of climate change-induced stresses on plants and detail the mechanisms used by plant-beneficial Pseudomonas strains to alleviate them. Recommendations are made to promote targeted research on the stress-alleviating potential of these bacteria.
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25
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Ramakrishnan P, Ariyan M, Rangasamy A, Rajasekaran R, Ramasamy K, Murugaiyan S, Janahiraman V. Draft Genome Sequence of Enterobacter cloacae S23 a Plant Growth-promoting Passenger Endophytic Bacterium Isolated from Groundnut Nodule Possesses Stress Tolerance Traits. Curr Genomics 2023; 24:36-47. [PMID: 37920731 PMCID: PMC10334703 DOI: 10.2174/1389202924666230403123208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 01/25/2023] [Accepted: 03/03/2023] [Indexed: 04/07/2023] Open
Abstract
Aim This study aims to reveal the passenger endophytic bacterium Enterobacter cloacae S23 isolated from groundnut nodules and to underpin the molecular mechanism and genes responsible for abiotic stress tolerance. Background A variety of microorganisms that contribute to nodulation and encourage plant development activity in addition to the nodulating Rhizobium. Passenger endophytes (PE) are endophytes that accidentally penetrate the plant without any selective pressure keeping them in the interior tissue of the plant. PE possesses characteristics that encourage plant development and boost output while reducing pathogen infection and improving biotic and abiotic stress tolerance. However, there is a lack of molecular evidence on the passenger endophyte-mediated alleviation of abiotic stresses. Objective This study was formulated to reveal the draft genome sequence of Enterobacter cloacae S23, as well as genes and characteristics involved in plant growth promotion and stress tolerance. Method The data were submitted to PATRIC and the TORMES-1.0 Unicyclker tools were used to conduct a complete genome study of Enterobacter cloacae S23. The TORMES-1.0 platform was used to process the reads. RAST tool kit (RASTtk) was used to annotate the S23 sequence. The plant growth-promoting traits such as indole acetic acid production, siderophore secretion, production of extracellular polysaccharides, biofilm formation, phosphate solubilization, and accumulation of osmolytes were examined under normal, 7% NaCl and 30% polyethylene glycol amended conditions to determine their ability to withstand salt and moisture stressed conditions, respectively. Result We report the size of Enterobacter cloacae S23 is 4.82Mb which contains 4511 protein-coding sequences, 71 transfer RNA genes, and 3 ribosomal RNA with a G+C content of DNA is 55.10%. Functional analysis revealed that most of the genes are involved in the metabolism of amino acids, cofactors, vitamins, stress response, nutrient solubilization (kdp, pho, pst), biofilm formation (pga) IAA production (trp), siderophore production (luc, fhu, fep, ent, ybd), defense, and virulence. The result revealed that E. cloacae S23 exhibited multiple plant growth-promoting traits under abiotic stress conditions. Conclusion Our research suggested that the discovery of anticipated genes and metabolic pathways might characterise this bacterium as an environmentally friendly bioresource to support groundnut growth through several mechanisms of action under multi-stresses.
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Affiliation(s)
- Pavithra Ramakrishnan
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
| | - Manikandan Ariyan
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
- Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
| | - Anandham Rangasamy
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
| | - Raghu Rajasekaran
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
| | - Krishnamoorthy Ramasamy
- Department of Crop Management, Vanavarayar Institute of Agriculture, Pollachi, Tamil Nadu, India
| | - SenthilKumar Murugaiyan
- Agricultural College and Research Institute, Tamil Nadu Agricultural University, Eachangkottai, India
| | - Veeranan Janahiraman
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, 641003, India
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26
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Tsai SH, Hsiao YC, Chang PE, Kuo CE, Lai MC, Chuang HW. Exploring the Biologically Active Metabolites Produced by Bacillus cereus for Plant Growth Promotion, Heat Stress Tolerance, and Resistance to Bacterial Soft Rot in Arabidopsis. Metabolites 2023; 13:metabo13050676. [PMID: 37233717 DOI: 10.3390/metabo13050676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/16/2023] [Accepted: 05/19/2023] [Indexed: 05/27/2023] Open
Abstract
Eight gene clusters responsible for synthesizing bioactive metabolites associated with plant growth promotion were identified in the Bacillus cereus strain D1 (BcD1) genome using the de novo whole-genome assembly method. The two largest gene clusters were responsible for synthesizing volatile organic compounds (VOCs) and encoding extracellular serine proteases. The treatment with BcD1 resulted in an increase in leaf chlorophyll content, plant size, and fresh weight in Arabidopsis seedlings. The BcD1-treated seedlings also accumulated higher levels of lignin and secondary metabolites including glucosinolates, triterpenoids, flavonoids, and phenolic compounds. Antioxidant enzyme activity and DPPH radical scavenging activity were also found to be higher in the treated seedlings as compared with the control. Seedlings pretreated with BcD1 exhibited increased tolerance to heat stress and reduced disease incidence of bacterial soft rot. RNA-seq analysis showed that BcD1 treatment activated Arabidopsis genes for diverse metabolite synthesis, including lignin and glucosinolates, and pathogenesis-related proteins such as serine protease inhibitors and defensin/PDF family proteins. The genes responsible for synthesizing indole acetic acid (IAA), abscisic acid (ABA), and jasmonic acid (JA) were expressed at higher levels, along with WRKY transcription factors involved in stress regulation and MYB54 for secondary cell wall synthesis. This study found that BcD1, a rhizobacterium producing VOCs and serine proteases, is capable of triggering the synthesis of diverse secondary metabolites and antioxidant enzymes in plants as a defense strategy against heat stress and pathogen attack.
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Affiliation(s)
- Sih-Huei Tsai
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi 600355, Taiwan
| | - Yi-Chun Hsiao
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi 600355, Taiwan
| | - Peter E Chang
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi 600355, Taiwan
| | - Chen-En Kuo
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi 600355, Taiwan
| | - Mei-Chun Lai
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi 600355, Taiwan
| | - Huey-Wen Chuang
- Department of Bioagricultural Sciences, National Chiayi University, Chiayi 600355, Taiwan
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27
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Ghorbel S, Aldilami M, Zouari-Mechichi H, Mechichi T, AlSherif EA. Isolation and characterization of a plant growth‑promoting rhizobacterium strain MD36 that promotes barley seedlings and growth under heavy metals stress. 3 Biotech 2023; 13:145. [PMID: 37124983 PMCID: PMC10140241 DOI: 10.1007/s13205-023-03566-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 04/15/2023] [Indexed: 05/02/2023] Open
Abstract
Plant growth, promoting, bacteria, (PGPB) can improve plant germination and growth in heavy metal-contaminated land and enhance heavy metal removal efficiency. In this study, we isolated PGPR bacterial strains which can withstand heavy metal pollution and tested their ability to improve barley germination under heavy metal stress. Out of 16 multi-resistant heavy metal isolates, strain MD36 was identified by 16S rRNA sequencing and shared close relation to different species of the genus Glutamicibacter. The new isolated strain showed other important PGPR activities, mainly IAA production and salt tolerance. The effect of adding the strain MD36 to barley grains under heavy metal stress enhanced their germination up to 100%, while the percentage of germination ranged between 0 and 20% for non-inoculated grains. In addition, in these conditions, MD36 can significantly enhance barley growth by reducing the heavy metal effect. This study strongly recommends the use of MD36 as seed coatings trials in the field to enhance growth and yield in soils contaminated with heavy metals, as well as in bioremediation of HM-contaminated salt-containing soils and water.
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Affiliation(s)
- Sofiane Ghorbel
- Jeddah, College of Science and Arts at Khulais, Biology Department, University of Jeddah, Jeddah, Saudi Arabia
- Plant Physiology and Functional Genomics Research Unit, Institute of Biotechnology, University of Sfax, 3038 Sfax, Tunisia
| | - Mohammad Aldilami
- Jeddah, College of Science and Arts at Khulais, Biology Department, University of Jeddah, Jeddah, Saudi Arabia
| | - Hela Zouari-Mechichi
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases, National School of Engineers of Sfax, University of Sfax, 3038 Sfax, Tunisia
| | - Tahar Mechichi
- Laboratory of Biochemistry and Enzymatic Engineering of Lipases, National School of Engineers of Sfax, University of Sfax, 3038 Sfax, Tunisia
| | - Emad Ali AlSherif
- Jeddah, College of Science and Arts at Khulais, Biology Department, University of Jeddah, Jeddah, Saudi Arabia
- Botany and Microbiology Department, Faculty of Science, Beni-Suef University, Beni‒Suef, 62521 Egypt
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Kouki H, Souihi M, Saadouli I, Balti S, Ayed A, Majdoub N, Mosbah A, Amri I, Mabrouk Y. Biocontrol Potential of Some Rhizospheric Soil Bacterial Strains against Fusarium culmorum and Subsequent Effect on Growth of Two Tunisian Wheat Cultivars. Microorganisms 2023; 11:1165. [PMID: 37317140 DOI: 10.3390/microorganisms11051165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 03/25/2023] [Accepted: 03/28/2023] [Indexed: 06/16/2023] Open
Abstract
PGPR (Plant Growth Promoting Rhizobacteria) are used as biofertilizers and biological control agents against fungi. The objective of this work was to evaluate the antagonistic activities of some bacterial strains isolated from soil against four phytopathogenic fungal strains (Fusarium graminearum, F. culmorum, Phytophthora sp. and Verticillium dahlia). Two strains having an antagonist effect on fungi and displaying the maximum of plant growth promoting (PGP) traits were selected for further study and identified as Bacillus subtilis and B. amyloliquefaciens respectively. In planta assays demonstrated that the two Bacillus strains are able to enhance plant growth of two wheat cultivars in absence of nitrogen and protect them against F. culmorum. Pot experiments performed in a greenhouse showed that wheat plants inoculation with two bacterial strains reduce F. culmorum disease severity correlated with the accumulation of phenolic compounds and chlorophyll content. These could partly explain the effectiveness of these bacteria in protecting Tunisian durum wheat cultivars against F. culmorum. Application B. amyloliquefaciens, showed better protection than B. subtilis although the last one enhanced more the plant growth of two wheat cultivars in absence of fungus. Hence, combination of two bacterial strains could be a strategic approach to enhance plant growth and control plant diseases.
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Affiliation(s)
- Habiba Kouki
- Laboratory of Biotechnology and Nuclear Technology, National Centre for Nuclear Sciences and Technologies (CNSTN), Sidi Thabet, Technopark, Ariana 2020, Tunisia
- Faculty of Sciences of Bizerte, Carthage University, Jarzouna 7021, Tunisia
| | - Mouna Souihi
- Laboratory of Biotechnology and Nuclear Technology, National Centre for Nuclear Sciences and Technologies (CNSTN), Sidi Thabet, Technopark, Ariana 2020, Tunisia
| | - Ilhem Saadouli
- Laboratory of Microorganisms and Active Biomolecules, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis 2092, Tunisia
| | - Sabrine Balti
- Laboratory of Biotechnology and Nuclear Technology, National Centre for Nuclear Sciences and Technologies (CNSTN), Sidi Thabet, Technopark, Ariana 2020, Tunisia
- Faculty of Sciences of Bizerte, Carthage University, Jarzouna 7021, Tunisia
| | - Amira Ayed
- Laboratory of Biotechnology and Nuclear Technology, National Centre for Nuclear Sciences and Technologies (CNSTN), Sidi Thabet, Technopark, Ariana 2020, Tunisia
- Higher Institute of Biotechnology of Sidi Thabet (ISBST), University of Manouba, Ariana 2020, Tunisia
| | - Nihed Majdoub
- Laboratory of Biotechnology and Nuclear Technology, National Centre for Nuclear Sciences and Technologies (CNSTN), Sidi Thabet, Technopark, Ariana 2020, Tunisia
| | - Amor Mosbah
- Laboratory of Biotechnology and Valorization of Bio-Geo Resources, Higher Institute of Biotechnology of Sidi Thabet (ISBST), University of Manouba, Ariana 2020, Tunisia
| | - Ismail Amri
- Laboratory of Biotechnology and Nuclear Technology, National Centre for Nuclear Sciences and Technologies (CNSTN), Sidi Thabet, Technopark, Ariana 2020, Tunisia
| | - Yassine Mabrouk
- Laboratory of Biotechnology and Nuclear Technology, National Centre for Nuclear Sciences and Technologies (CNSTN), Sidi Thabet, Technopark, Ariana 2020, Tunisia
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Rahnama S, Ghehsareh Ardestani E, Ebrahimi A, Nikookhah F. Seed priming with plant growth-promoting bacteria (PGPB) improves growth and water stress tolerance of Secale montanum. Heliyon 2023; 9:e15498. [PMID: 37151636 PMCID: PMC10161722 DOI: 10.1016/j.heliyon.2023.e15498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 04/04/2023] [Accepted: 04/11/2023] [Indexed: 05/09/2023] Open
Abstract
Abiotic and biotic stresses are major global threats to food security in the 21st century. Application of plant growth-promoting bacteria (PGPB) in rangeland plants is the only possible alternative that supports plant growth and development to combat environmental stress and successfully restoring rangelands. PGPBs were also found to be a potential substitute for chemical fertilizers and pesticides. The challenge is to determine which biofertilizers can be used for Secale montanum in normal and under water stress conditions. We sought to determine the benefits of PGPB for S. montanum under water stress conditions in terms of seedling growth traits, growth indicators, and nutrient uptake in the research greenhouse. Therefore, a completely randomized factorial design was conducted with two treatments of PGPB inoculation, including the control (no PGPB inoculation), PGPBs Bacillus cereus, Pseudomonas aeruginosa, Azospirillum lipoferm, and Azotobacter chroococcum, and water stress in the research greenhouse. Overall, the results of the current study showed that water stress greatly reduced the above-ground fresh weight of above-ground plant parts and the nitrogen and potassium content of S. montanum. The present study confirms the positive effects of PGPB on fresh and dry weights of above- and below-ground parts and seedling, vigor index, quality index, and nitrogen and potassium content of S. montanum, except for below-ground parts length, compared with the controls, which shows that PGPB usually improves some indicators of plant growth and development. We suggest that restoration of S. montanum seed inoculation with PGPB should be supported in degraded rangelands and marginal drylands in low rainfall years, which may cause water scarcity and consequently water stress in arid and semi-arid regions.
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Affiliation(s)
- Shiva Rahnama
- Department of Rangeland and Watershed Management, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, 8818634141, Iran
| | - Elham Ghehsareh Ardestani
- Department of Rangeland and Watershed Management, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, 8818634141, Iran
- Central Laboratory, Shahrekord University, Shahrekord, Iran
- Corresponding author. Department of Rangeland and Watershed Management, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, 8818634141, Iran.
| | - Ataollah Ebrahimi
- Department of Rangeland and Watershed Management, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, 8818634141, Iran
| | - Farzaneh Nikookhah
- Department of Fishery Science, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, 8818634141, Iran
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Monjezi N, Yaghoubian I, Smith DL. Cell-free supernatant of Devosia sp. (strain SL43) mitigates the adverse effects of salt stress on soybean ( Glycine max L.) seed vigor index. FRONTIERS IN PLANT SCIENCE 2023; 14:1071346. [PMID: 37056501 PMCID: PMC10086148 DOI: 10.3389/fpls.2023.1071346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Accepted: 02/20/2023] [Indexed: 06/19/2023]
Abstract
Soil salinity is a major constraint for soybean production worldwide, and the exploitation of plant growth-promoting bacteria (PGPB) and their bioactive metabolite(s) can improve plant salinity tolerance. With this objective, two experiments were performed, aiming to test 4 culture media (YEM(A), TYE(A), TS(A), and LB(A)) for growing a novel Devosia sp. (strain SL43), and then evaluating cell-free supernatants (CFS) from the Devosia sp. on germination of soybean (Glycine max L.) seeds under salinity stress. Soybean seeds were subjected to three salinity levels (0, 100, and 125 mM NaCl) and 6 levels of Devosia sp. CFS dilution (0, 1:1, 1:100, 1:250, 1:500, 1:1000). The results indicated that 125 mM NaCl concentration caused the greatest reduction in the total number of germinated seeds (15%), germination rate (43.6%), root length (55.2%), root weight (39.3%), and seed vigor (68%), and it also increased mean germination time by 71.9%. However, Devosia-CFS improved soybean germination, and the greatest effect was obtained at 1:1 dilution. Under the highest salinity level, application of CFS at 1:1 dilution increased final germination (17.6%), germination rate (18.6%), root length (162.2%), root weight (239.4%), seed vigor index (318.7%), and also shortening mean germination time by 19.2%. The results indicated that seed vigor index was positively correlated with other traits except for mean germination time. Our study suggested that the highest productivity of Devoisa sp. was obtained from the YEM medium. Results also suggested that CFS produced by the novel Devosia sp. (SL43 strain) can successfully alleviate salt stress effects on soybean seed germination and manipulating the chemical composition of the growth medium can influence the effectiveness of these bioactive metabolites.
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Barcia-Piedras JM, Pérez-Romero JA, Mateos-Naranjo E, Parra R, Rodríguez-Llorente ID, Camacho M, Redondo-Gómez S. Stimulation of PGP Bacteria on the Development of Seeds, Plants and Cuttings of the Obligate Halophyte Arthrocaulon (Arthrocnemum) macrostachyum (Moric.) Piirainen & G. Kadereit. PLANTS (BASEL, SWITZERLAND) 2023; 12:1436. [PMID: 37050061 PMCID: PMC10096739 DOI: 10.3390/plants12071436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 03/14/2023] [Accepted: 03/21/2023] [Indexed: 06/19/2023]
Abstract
The Earth is undergoing alterations at a high speed, which causes problems such as environmental pollution and difficulty in food production. This is where halophytes are interesting, due to their high potential in different fields, such as remediation of the environment and agriculture. For this reason, it is necessary to deepen the knowledge of the development of halophytes and how plant growth-promoting bacteria (PGP) can play a fundamental role in this process. Therefore, in this work were tested the effects of five PGP bacteria on its rhizosphere and other endophytic bacteria at different concentrations of NaCl on seed germination, plant growth (0 and 171 mM) and cutting growth (0 mM) of Arthrocaulon macrostachyum. The growth promotion in this strict halophyte is highlighted due to the presence of PGP bacteria and the fact that no salt is needed. Thus, without salt, the bacterial strains Kocuria polaris Hv16, Pseudarthrobacter psychrotolerans C58, and Rahnella aceris RTE9 enhanced the biomass production by more than 60% in both stems and roots. Furthermore, germination was encouraged by more than 30% in the presence of both R. aceris RTE9 and K. polaris Hv16 at 171 mM NaCl; the latter also had a biocontrol effect on the fungi that grew on the seeds. Additionally, for the first time in cuttings of this perennial species, the root biomass was improved thanks to the consortium of K. polaris Hv16 and P. psychrotolerans C58. Finally, this study demonstrates the potential of PGPs for optimising the development of halophytes, either for environmental or agronomic purposes.
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Affiliation(s)
- José-María Barcia-Piedras
- Centro Las Torres, Instituto de Investigación y Formación Agraria y Pesquera (IFAPA), Carretera, Sevilla-Cazalla de la Sierra Km 12.2, 41200 Alcalá del Río, Spain;
| | - Jesús-Alberto Pérez-Romero
- Departamento de Biología, Instituto Universitario de Investigación Marina (INMAR), Universidad de Cádiz, 11510 Puerto Real, Spain
| | - Enrique Mateos-Naranjo
- Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012 Sevilla, Spain
| | - Raquel Parra
- Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012 Sevilla, Spain
| | | | - María Camacho
- Centro Las Torres, Instituto de Investigación y Formación Agraria y Pesquera (IFAPA), Carretera, Sevilla-Cazalla de la Sierra Km 12.2, 41200 Alcalá del Río, Spain;
| | - Susana Redondo-Gómez
- Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012 Sevilla, Spain
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Dragojević M, Stankovic N, Djokic L, Raičević V, Jovičić-Petrović J. Endorhizosphere of indigenous succulent halophytes: a valuable resource of plant growth promoting bacteria. ENVIRONMENTAL MICROBIOME 2023; 18:20. [PMID: 36934265 PMCID: PMC10024849 DOI: 10.1186/s40793-023-00477-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Accepted: 03/06/2023] [Indexed: 06/18/2023]
Abstract
The adaptability of halophytes to increased soil salinity is related to complex rhizosphere interactions. In this study, an integrative approach, combining culture-independent and culture-dependent techniques was used to analyze the bacterial communities in the endorizosphere of indigenous succulent halophytes Salicornia europaea, Suaeda maritima, and Camphorosma annua from the natural salt marshes of Slano Kopovo (Serbia). The 16 S rDNA analyses gave, for the first time, an insight into the composition of the endophytic bacterial communities of S. maritima and C. annua. We have found that the composition of endophyte microbiomes in the same habitat is to some extent influenced by plant species. A cultivable portion of the halophyte microbiota was tested at different NaCl concentrations for the set of plant growth promoting (PGP) traits. Through the mining of indigenous halotolerant endophytes, we obtained a collection representing a core endophyte microbiome conferring desirable PGP traits. The majority (65%) of the selected strains belonged to the common halotolerant/halophilic genera Halomonas, Kushneria, and Halobacillus, with representatives exhibiting multiple PGP traits, and retaining beneficial traits in conditions of the increased salinity. The results suggest that the root endosphere of halophytes is a valuable source of PGP bacteria supporting plant growth and fitness in salt-affected soils.
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Affiliation(s)
- Milica Dragojević
- Faculty of Agriculture, University of Belgrade, Nemanjina 6, Zemun, 11080 Serbia
| | - Nada Stankovic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, Belgrade, Serbia
| | - Lidija Djokic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, Belgrade, Serbia
| | - Vera Raičević
- Faculty of Agriculture, University of Belgrade, Nemanjina 6, Zemun, 11080 Serbia
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Amri M, Rjeibi MR, Gatrouni M, Mateus DMR, Asses N, Pinho HJO, Abbes C. Isolation, Identification, and Characterization of Phosphate-Solubilizing Bacteria from Tunisian Soils. Microorganisms 2023; 11:microorganisms11030783. [PMID: 36985356 PMCID: PMC10052640 DOI: 10.3390/microorganisms11030783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 03/08/2023] [Accepted: 03/16/2023] [Indexed: 03/22/2023] Open
Abstract
Soil microorganisms play an important role in maintaining natural ecological balance through active participation in carbon, nitrogen, sulfur, and phosphorous cycles. Phosphate-solubilizing bacteria (PSB) are of high importance in the rhizosphere, enhancing the solubilization of inorganic phosphorus complexes into soluble forms available for plant nutrition. The investigation of this species of bacteria is of major interest in agriculture, as they can be used as biofertilizers for crops. In the present study, 28 isolates of PSB were obtained after the phosphate enrichment of soil samples from five Tunisian regions. Five PSB species were identified by 16S rRNA gene sequencing including Pseudomonas fluorescens, P. putida, and P. taiwanensis, Stenotrophomonas maltophilia, and Pantoea agglomerans. Solid and liquid Pikovskaya’s (PVK) and National Botanical Research Institute’s (NBRIP) media containing insoluble tricalcium phosphate were used for the evaluation of the phosphate solubilization ability of the bacterial isolates by two methods: visual evaluation of the solubilization zone around colonies (halo) and determination of solubilized phosphates in liquid medium by the colorimetric method of the vanado-molybdate yellow. Based on the results of the halo method, the isolate of each species that showed the higher phosphate solubilization index was selected for evaluation of phosphate solubilization by the colorimetric method. In the liquid media, the bacterial isolates showed phosphate solubilization ranging from 535.70 to 618.57 µg mL−1 in the NBRIP medium, and 374.20 to 544.28 µg mL−1 in the PVK medium, with the highest values produced by P. fluorescens. The best phosphate solubilization ability and higher reduction in broth pH, which indicates higher organic acid production, were achieved in NBRIP broth for most of the PSB. Strong correlations were observed between the average capability of PSB to solubilize phosphates and both the pH and total phosphorous content in the soil. The production of the hormone indole acetic acid (IAA), which can promote plant growth, was observed for all five PSB species. Among them, P. fluorescens obtained from the forest soil of northern Tunisia showed the highest production of IAA (50.4 ± 0.9 µg mL−1).
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Affiliation(s)
- Marwa Amri
- Laboratory of Resources Sylvo-Pastoral, Institute Sylvo-Pastoral of Tabarka (ISPT), Université de Jendouba, Isp.Tabarka BP. n° 345, Tabarka 8110, Tunisia
- Laboratory Research of Science and Technology of Environmental (LRSTE), Higher Institute Science and Technology Environmental À Borj Cédria, and Faculty of Sciences of Bizerte (FSB), Université de Carthage, BP-1003, Hammam-Lif 2050, Tunisia
| | - Mohamed Ridha Rjeibi
- Laboratoire de Parasitologie, École Nationale de Médecine Vétérinaire de Sidi Thabet, Université de La Manouba, Sidi Thabet 2020, Tunisia
- Laboratoire de Parasitologie, Institut de La Recherche Vétérinaire de Tunisie, Université de Tunis El Manar, 20 Rue de Jebel Lakdhar, La Rabta, Tunis 1006, Tunisia
| | - Marwa Gatrouni
- Laboratory Research of Science and Technology of Environmental (LRSTE), Higher Institute Science and Technology Environmental À Borj Cédria, and Faculty of Sciences of Bizerte (FSB), Université de Carthage, BP-1003, Hammam-Lif 2050, Tunisia
| | - Dina M. R. Mateus
- Techn&Art, Centre for Technology, Restoration and Art Enhancement, Instituto Politécnico de Tomar, Estrada da Serra, 2300-313 Tomar, Portugal
- Correspondence:
| | - Nedra Asses
- Laboratory Research of Science and Technology of Environmental (LRSTE), Higher Institute Science and Technology Environmental À Borj Cédria, and Faculty of Sciences of Bizerte (FSB), Université de Carthage, BP-1003, Hammam-Lif 2050, Tunisia
- Laboratory of Ecologies and Microbial Technology (LETMI), National Institute of Applied Science and Technology (INSAT), Université de Carthage, 2 Boulevard de La Terre, B.P. 676, Tunis 1080, Tunisia
| | - Henrique J. O. Pinho
- Ci2, Smart Cities Research Center, Instituto Politécnico de Tomar, Estrada da Serra, 2300-313 Tomar, Portugal
| | - Chaabane Abbes
- Laboratory of Resources Sylvo-Pastoral, Institute Sylvo-Pastoral of Tabarka (ISPT), Université de Jendouba, Isp.Tabarka BP. n° 345, Tabarka 8110, Tunisia
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Klimek B, Stępniewska K, Seget B, Pandey VC, Babst-Kostecka A. Diversity and activity of soil biota at a post-mining site highly contaminated with Zn and Cd are enhanced by metallicolous compared to non-metallicolous Arabidopsis halleri ecotypes. LAND DEGRADATION & DEVELOPMENT 2023; 34:1538-1548. [PMID: 37485419 PMCID: PMC10358741 DOI: 10.1002/ldr.4551] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 11/23/2022] [Indexed: 07/25/2023]
Abstract
Hyperaccumulators' ability to take up large quantities of harmful heavy metals from contaminated soils and store them in their foliage makes them promising organisms for bioremediation. Here we demonstrate that some ecotypes of the zinc hyperaccumulator Arabidopsis halleri are more suitable for bioremediation than others, because of their distinct influence on soil biota. In a field experiment, populations originating from metal-polluted and unpolluted soils were transplanted to a highly contaminated metalliferous site in Southern Poland. Effects of plant ecotypes on soil biota were assessed by measurements of feeding activity of soil fauna (bait-lamina test) and catabolic activity and functional diversity of soil bacteria underneath A. halleri plants (Biolog® ECO plates). Chemical soil properties, plant morphological parameters, and zinc concentration in shoots and roots were additionally evaluated. Higher soil fauna feeding activity and higher bacterial community functional diversity were found in soils affected by A. halleri plants originating from metallicolous compared to non-metallicolous ecotypes. Differences in community-level physiological profiles further evidenced changes in microbial communities in response to plant ecotype. These soil characteristics were positively correlated with plant size. No differences in zinc content in shoots and roots, zinc translocation ratio, and plant morphology were observed between metallicolous and non-metallicolous plants. Our results indicate strong associations between A. halleri ecotype and soil microbial community properties. In particular, the improvement of soil biological properties by metallicolous accessions should be further explored to optimize hyperaccumulator-based bioremediation technologies.
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Affiliation(s)
- Beata Klimek
- Institute of Environmental Sciences, Faculty of Biology, Jagiellonian University, Kraków, Poland
| | - Klaudia Stępniewska
- Institute of Environmental Sciences, Faculty of Biology, Jagiellonian University, Kraków, Poland
| | - Barbara Seget
- Botany Institute, Polish Academy of Science, Kraków, Poland
| | - Vimal Chandra Pandey
- Department of Environmental Science, Babasaheb Bhimrao Ambedkar University, Lucknow, Uttar Pradesh, India
| | - Alicja Babst-Kostecka
- Department of Environmental Science, The University of Arizona, Tucson, Arizona, USA
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Bakshi P, Sharma P, Chouhan R, Mir BA, Gandhi SG, Bhardwaj R, Alam P, Ahmad P. Interactive effect of 24-epibrassinolide and plant growth promoting rhizobacteria inoculation restores photosynthetic attributes in Brassica juncea L. under chlorpyrifos toxicity. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 320:120760. [PMID: 36464116 DOI: 10.1016/j.envpol.2022.120760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 11/17/2022] [Accepted: 11/24/2022] [Indexed: 06/17/2023]
Abstract
Chlorpyrifos (CP) is a commonly used organophosphorous pesticide that is frequently utilised in the agricultural industry because of its great efficiency and inexpensive cost. The focus of the present study was to assess the impact of CP toxicity on Brassica juncea L. and to unravel the ameliorative potential of phytohormone, 24-epibrassinolide (EBL) mediated plant-microbe (Pseudomonas aeruginosa (B1), Burkholderia gladioli (B2)) interaction in B. juncea L. The maximum significant increment in the total chlorophyll, carotenoids, xanthophyll, anthocyanin and flavonoid content with EBL and B2 treatment in CP stressed B. juncea seedlings on spectrophotometric analysis were observed. Autofluorescence imaging of photosynthetic pigments i.e. chlorophyll, carotenoids, and total phenols with confocal microscopy showed maximum fluorescence with EBL and B2. Furthermore, when compared to CP stressed seedlings, scanning electron microscopy (SEM) study of the abaxial surface of leaves revealed a recovery in stomatal opening. The supplementation of EBL and PGPR (plant growth promoting rhizobacteria) improved the level of psb A (D1 subunit PSII) and psb B (CP 47 subunit of PSII) genes expression. The expression analysis of chalcone synthase (CHS), Phenylalanine ammonialyase (PAL), Phyotene synthase (PSY) with RT-PCR system showed up-regulation in the expression when supplemented with EBL and PGPR. As a result, the current study suggests that EBL and PGPR together, can reduce CP-induced toxicity in B. juncea seedlings and recovering the seedling biomass.
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Affiliation(s)
- Palak Bakshi
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, India
| | - Pooja Sharma
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, India
| | - Rekha Chouhan
- Indian Institute of Integrative Medicine (CSIR-IIIM), Council of Scientific and Industrial Research, Canal Road, Jammu, 180001, India
| | - Bilal Ahmad Mir
- Department of Botany, School of Life Science, Satellite Campus, University of Kashmir, Kargil, Jammu and Kashmir, 190006, India; Department of Botany, Kargil Campus, Khumbathang-Kargil, University of Ladakh, Ladakh, 194105, India
| | - Sumit G Gandhi
- Indian Institute of Integrative Medicine (CSIR-IIIM), Council of Scientific and Industrial Research, Canal Road, Jammu, 180001, India
| | - Renu Bhardwaj
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, India
| | - Pravej Alam
- Department of Biology, College of Science and Humanities, Prince Sattam Bin Abdulaziz University, Al-Kharj, 11942, Saudi Arabia
| | - Parvaiz Ahmad
- Department of Botany, GDC, Pulwama, 192301, Jammu and Kashmir, India.
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Rojas-Solis D, Vences-Guzmán MÁ, Sohlenkamp C, Santoyo G. Cardiolipin synthesis in Pseudomonas fluorescens UM270 plays a relevant role in stimulating plant growth under salt stress. Microbiol Res 2023; 268:127295. [PMID: 36587534 DOI: 10.1016/j.micres.2022.127295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/22/2022] [Accepted: 12/23/2022] [Indexed: 12/29/2022]
Abstract
Membrane cardiolipin (CL) phospholipids play a fundamental role in the adaptation of bacteria to various environmental conditions, including saline stress. Here, we constructed deletion mutants of two CL synthetase genes, clsA (UM270 ∆clsA) and clsB (UM270 ∆clsB), in the rhizobacterium Pseudomonas fluorescens UM270, and evaluated their role in plant growth promotion under salt stress. UM270 ∆clsA and UM270 ∆clsB mutants showed a significant reduction in CL synthesis compared to the P. fluorescens UM270 wild-type (UM270 wt) strain (58% ∆clsA and 53% ∆clsB), and their growth rate was not affected, except when grown at 100 and 200 mM NaCl. Additionally, the root colonization capacity of both mutant strains was impaired compared with that of the wild type. Concomitant with the deletion of clsA and clsB genes, some physiological changes were observed in the UM270 ∆clsA and UM270 ∆clsB mutants, such as a reduction in indole acetic acid and biofilm production. By contrast, an increase in siderophore biosynthesis was observed. Further, inoculation of the UM270 wt strain in tomato plants (Solanum lycopersicum) grown under salt stress conditions (100 and 200 mM NaCl) resulted in an increase in root and shoot length, chlorophyll content, and dry weight. On the contrary, when each of the mutants were inoculated in tomato plants, a reduction in root length was observed when grown at 200 mM NaCl, but the shoot length, chlorophyll content, and total plant dry weight parameters were significantly reduced under normal or saline conditions (100 and 200 mM NaCl), compared to UM270 wt-inoculated plants. In conclusion, these results suggest that CL synthesis in P. fluorescens UM270 plays an important role in the promotion of tomato plant growth under normal conditions, but to a greater extent, under salt-stress conditions.
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Affiliation(s)
- Daniel Rojas-Solis
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | | | - Christian Sohlenkamp
- Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, Mexico
| | - Gustavo Santoyo
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico.
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Siddharthan N, Balagurunathan R, Venkatesan S, Hemalatha N. Bio-efficacy of Geobacillus thermodenitrificans PS41 against larvicidal, fungicidal, and plant growth-promoting activities. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:42596-42607. [PMID: 35670947 DOI: 10.1007/s11356-022-20455-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 04/21/2022] [Indexed: 06/15/2023]
Abstract
The microbial interactions with plant hosts were known to establish plant growth and beneficial productivity. Some bacteria, fungi, actinomycetes, yeast, and algae have proven as potential effective microbes in agricultural field. In this study, the insecticidal effect of Geobacillus thermodenitrificans PS41 secondary metabolites was tested against third instar larvae of Spodoptera litura, with mortality rate 60.26 ± 1.5% which might influence the agropest management. The test bacterial metabolites were subjected to GC-MS analysis. Totally, 17 different compounds were identified from the ethyl acetate extract metabolites of PS41 strain. The highest peak was obtained with behenic alcohol compound followed by 1-octadecene and penta erythrityl tetrachloride. The Geobacillus thermodenitrificans PS41 secondary metabolites showed potential antifungal activity against plant pathogenic fungi. The highest inhibit was attained against Cladosporium sp., (25 mm) followed by Rhizoctonia solani and Alternaria brassicola (23 mm). However, no toxic effect was exerted upon earthworm (Perionyx excavatus) when treated with PS41 bacterial metabolites. The potential PS41 strain was also found supporting the plant growth. The potential bacterial strain PS41 did not show antagonistic activity against soil bacteria such as Rhizobium sp., Azotobacter sp., Azospirullum brasilense, Pseudomonas fluorescens and Bacillus megaterium. The potential test organism, Geobacillus thermodenitrificans PS41, possessing biopesticide and biofertilizer properties can be a suitable ecofriendly organic applicant in agricultural field for enhancing crop production.
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Affiliation(s)
- Nagarajan Siddharthan
- Department of Microbiology, Periyar University, Periyar Palkalai Nagar, Salem, Tamil Nadu, 11, India
| | - Ramasamy Balagurunathan
- Department of Microbiology, Periyar University, Periyar Palkalai Nagar, Salem, Tamil Nadu, 11, India
| | - Srinivasan Venkatesan
- Department of Environmental Science, Periyar University, Periyar Palkalai Nagar, Salem, Tamil Nadu, 11, India
| | - Natarajan Hemalatha
- Department of Microbiology, Periyar University, Periyar Palkalai Nagar, Salem, Tamil Nadu, 11, India.
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Soni SK, Kumar G, Bajpai A, Singh R, Bajapi Y, Tiwari S. Hexavalent chromium-reducing plant growth-promoting rhizobacteria are utilized to bio-fortify trivalent chromium in fenugreek by promoting plant development and decreasing the toxicity of hexavalent chromium in the soil. J Trace Elem Med Biol 2023; 76:127116. [PMID: 36481602 DOI: 10.1016/j.jtemb.2022.127116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 11/23/2022] [Accepted: 11/30/2022] [Indexed: 12/12/2022]
Abstract
BACKGROUND Fenugreek is known to have good anti-diabetes properties. Moreover, several studies accounted that the trivalent form of chromium [Cr(III)] also have anti-diabetic properties. However, its hexavalent form i.e., Cr(VI) is known to be highly toxic and carcinogenic to living beings and retarded plant growth even if it is present in low concentration in soil. Many plant growth-promoting rhizobacteria (PGPR) are reported to have the potential to reduce the Cr(VI) into Cr(III) in soil. In view of the above, the present objective was designed to effectively utilize Cr(VI) reducing PGPRs for the growth and development of fenugreek plant in Cr(VI) amended soil, apart from reducing Cr(VI) in soil and fortification of Cr(III) in the aerial part of plants. METHODS The experiment was carried out to evaluate the effect of Cr(VI)-reducing PGPRs viz. Bacillus cereus (SUCR44); Microbacterium sp. (SUCR140); Bacillus thuringiensis (SUCR186) and B. subtilis (SUCR188) on growth, uptake and translocation of Cr as well as other physiological parameters in fenugreek grown under artificially Cr(VI) amended soil (100 mg kg-1 of Cr(VI) in soil). RESULTS The aforementioned concentration of Cr(VI) in soil cause severe reduction in root length (41 %), plant height (43 %), dry root (38 %) and herb biomass (48 %), when compared with control negative (CN; uninoculated plant not grown in Cr(VI) contaminated soil). However, the presence of Microbacterium sp.-SURC140 (MB) mitigates the Cr toxicity resulting in improved root length (92 %), plant height (86 %), dry root (74 %) and herb biomass (99 %) as compared with control positive (CP; uninoculated plants grown in Cr(VI) contaminated soil). The maximum reduction in bioavailability (82 %) of Cr(VI) in soil and its uptake (50 %) by the plant were also observed in MB-treated plants. However, All Cr(VI)-reducing PGPRs failed to decrease the translocation of Cr to the aerial parts. Moreover, the plant treated with MB observed diminution in relative water content (13 %), electrolyte leakage (16%) and lipid peroxidation (38 %) as well as higher chlorophyll (37 %) carotenoids (17 %) contents and antioxidants (18%) potential. CONCLUSION This study demonstrates that MB can lower the Cr(VI) toxicity to the plant by reducing the bioavailable Cr(VI), consequently reducing the Cr(VI) toxicity level in soil and helping in improving the growth and yield of fenugreek. Additionally, Cr(III) uptakes and translocation may improve the effectiveness of fenugreek in treating diabetes.
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Affiliation(s)
- Sumit K Soni
- Department of Microbial Technology Division, CSIR, Central Institute of Medicinal and Aromatic Plants, Lucknow 226015, India; Crop Improvement and Biotechnology Division, ICAR, Central Institute for Subtropical Horticulture, Rehmankhera, P.O. Kakori, Lucknow 226101, India.
| | - Govind Kumar
- Crop Production Division, ICAR, Central Institute for Subtropical Horticulture, Rehmankhera, P.O. Kakori, Lucknow 226101, India
| | - Anju Bajpai
- Crop Improvement and Biotechnology Division, ICAR, Central Institute for Subtropical Horticulture, Rehmankhera, P.O. Kakori, Lucknow 226101, India
| | - Rakshapal Singh
- Department of Microbial Technology Division, CSIR, Central Institute of Medicinal and Aromatic Plants, Lucknow 226015, India; Biological Central Facility, CSIR, Central Institute of Medicinal and Aromatic Plants, Lucknow 226015, India
| | - Yashi Bajapi
- Crop Improvement and Biotechnology Division, ICAR, Central Institute for Subtropical Horticulture, Rehmankhera, P.O. Kakori, Lucknow 226101, India
| | - Sudeep Tiwari
- Department of Geography and Environmental Development, Ben Gurion University of the Negev, P.O.B. 653 Beer-Sheva, Israel.
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Sharma P, Aswini K, Sai Prasad J, Kumar N, Pathak D, Gond S, Venkadasamy G, Suman A. Characterization of actinobacteria from wheat seeds for plant growth promoting traits and protection against fungal pathogens. J Basic Microbiol 2023; 63:439-453. [PMID: 36319472 DOI: 10.1002/jobm.202200259] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 09/13/2022] [Accepted: 10/01/2022] [Indexed: 11/06/2022]
Abstract
Seeds harbor naturally occurring microbial endophytes that proliferate during seedling development; playing crucial roles in seedling growth, establishment, and protection against fungal pathogens. Resilient actinobacteria of wheat seeds have been explored in this study for their beneficial traits. Ten actinobacteria isolated from the surface-sterilized seeds of wheat variety HD3117 were identified as nine species of Streptomyces and one of Nocardiopsis. Most isolates could grow at 42°C, 5% NaCl, and 10% poly ethylene glycol (PEG); exhibited variable hydrolytic enzyme production for amylase, cellulase, and protease. Few isolates produced indole acetic acid (9.0-18.9 µg ml-1 ) and could solubilize P (11.3-85.2 µg ml-1 ). The isolates were antagonistic against one or more fungal pathogens under test (Fusarium graminearum, Bipolaris sorokiniana, Alternaria sp., and Tilletia indica), of which Streptomyces sampsonii WSA20 inhibited all in dual culture assay. Priming of wheat seeds with the efficient isolate WSA20 led to effective colonization in the root zone and significantly improved germination, shoot and root length in seed germination assay. Significant protection was recorded in microcosm experiment where no symptoms of disease were observed. This study shows the significance of actinobacterial endophytes of wheat seeds in influencing seed germination and seedling growth while protecting from soil-borne pathogens. It is original and suggests that the seed inhabiting efficient actinobacteria may be developed as efficient bioinoculant for sustainable farming system.
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Affiliation(s)
- Pushpendra Sharma
- Division of Microbiology, ICAR-Indian Agricultural Research Institute (IARI), New Delhi, India
| | - Krishnan Aswini
- Division of Microbiology, ICAR-Indian Agricultural Research Institute (IARI), New Delhi, India
| | - Jogdande Sai Prasad
- Division of Microbiology, ICAR-Indian Agricultural Research Institute (IARI), New Delhi, India
| | - Naresh Kumar
- Division of Microbiology, ICAR-Indian Agricultural Research Institute (IARI), New Delhi, India
| | - Devashish Pathak
- Division of Microbiology, ICAR-Indian Agricultural Research Institute (IARI), New Delhi, India
| | - Shrikant Gond
- Division of Microbiology, ICAR-Indian Agricultural Research Institute (IARI), New Delhi, India
| | - Govindasamy Venkadasamy
- Division of Microbiology, ICAR-Indian Agricultural Research Institute (IARI), New Delhi, India
| | - Archna Suman
- Division of Microbiology, ICAR-Indian Agricultural Research Institute (IARI), New Delhi, India
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Singh P, Singh RK, Li HB, Guo DJ, Sharma A, Verma KK, Solanki MK, Upadhyay SK, Lakshmanan P, Yang LT, Li YR. Nitrogen fixation and phytohormone stimulation of sugarcane plant through plant growth promoting diazotrophic Pseudomonas. Biotechnol Genet Eng Rev 2023:1-21. [PMID: 36814143 DOI: 10.1080/02648725.2023.2177814] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Accepted: 01/30/2023] [Indexed: 02/24/2023]
Abstract
Diazotrophic microorganisms are free-living groups of organisms that can convert atmospheric nitrogen (N) into bioavailable nitrogen for plants, which increases crop development and production. The purpose of the current study was to ascertain how diazotrophic plant growth promoting (PGP) Pseudomonas strains (P. koreensis CY4 and P. entomophila CN11) enhanced nitrogen fixation, defense activity, and PGP attributes of sugarcane varieties; GT11 and G×B9. A 15N isotope-dilution study was conducted to confirm the sugarcane strains' capacity to fix nitrogen, and the results indicated that between 21 to 35% of plant, nitrogen is fixed biologically by selected rhizobacteria. In comparison to the control, after 30, 60, and 90 days, both CY4 and CN11 strains significantly increased defense-related enzymes (catalase, peroxidase, phenylalanine ammonia-lyase, superoxide dismutase, glucanase, and chitinase) and phytohormones (abscisic acid, ABA, cytokinin, etc.) in GT11 and GXB. Additionally, the expression of SuCHI, SuGLU, SuCAT, SuSOD, and SuPAL genes was found to be elevated in Pseudomonas strains inoculated plants using real-time quantitative polymerase chain reaction (RT-qPCR). Both bacterial strains increased all physiological parameters and chlorophyll content in sugarcane plants more than their control. The effects of P. koreensis CY4 and P. entomophila CN11 strains on sugarcane growth promotion and nitrogen fixation under greenhouse conditions are described here for the first time systematically. The results of confirmation studies demonstrated that P. koreensis CY4 and P. entomophila are PGP bacterial strains with the potential to be employed as a biofertilizer for sugarcane growth, nitrogen nutrient absorption, and reduced application of chemical nitrogenous fertilizers in agricultural fields. .
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Affiliation(s)
- Pratiksha Singh
- School of Marine Sciences and Biotechnology, Guangxi Minzu University, Nanning, China
| | - Rajesh Kumar Singh
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Guangxi Key Laboratory of Crop Genetic Improvement and Biotechnology, Nanning, China
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture, Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Guangxi Key Laboratory of Sugarcane Genetic Improvement, Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Hai-Bi Li
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Guangxi Key Laboratory of Crop Genetic Improvement and Biotechnology, Nanning, China
| | - Dao-Jun Guo
- College of Life Sciences and Engineering, Hexi University, Zhangye, China
| | - Anjney Sharma
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Guangxi Key Laboratory of Crop Genetic Improvement and Biotechnology, Nanning, China
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture, Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Guangxi Key Laboratory of Sugarcane Genetic Improvement, Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Krishan K Verma
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Guangxi Key Laboratory of Crop Genetic Improvement and Biotechnology, Nanning, China
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture, Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Guangxi Key Laboratory of Sugarcane Genetic Improvement, Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Manoj Kumar Solanki
- Plant Cytogenetics and Molecular Biology Group, Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Katowice, Poland
| | - Sudhir K Upadhyay
- Department of Environmental Science, V.B.S. Purvanchal University, Jaunpur, India
| | - Prakash Lakshmanan
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Guangxi Key Laboratory of Crop Genetic Improvement and Biotechnology, Nanning, China
| | - Li-Tao Yang
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture, Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Guangxi Key Laboratory of Sugarcane Genetic Improvement, Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Yang-Rui Li
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Guangxi Key Laboratory of Crop Genetic Improvement and Biotechnology, Nanning, China
- Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi), Ministry of Agriculture, Sugarcane Research Center, Chinese Academy of Agricultural Sciences, Guangxi Key Laboratory of Sugarcane Genetic Improvement, Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China
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Peng J, Xu Z, Li L, Zhao B, Guo Y. Disruption of the sensor kinase phoQ gene decreases acid resistance in plant growth-promoting rhizobacterium Rahnella aquatilis HX2. J Appl Microbiol 2023; 134:6991427. [PMID: 36748653 DOI: 10.1093/jambio/lxad009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 12/24/2022] [Accepted: 01/17/2023] [Indexed: 01/20/2023]
Abstract
AIMS Rahnella aquatilis HX2, a promising plant growth-promoting rhizobacterium (PGPR) in the field, contains genes homologous to the PhoP/PhoQ two-component regulatory system. Although this system regulates stress response in numerous pathogens, PhoP/PhoQ characterization in a PGPR has not received in-depth exploration. METHODS AND RESULTS The phoQ gene was mutated in strain HX2 using an in-frame deletion strategy. Compared to the wild type, the phoQ mutant exhibited increased sensitivity to acidic conditions (pH 4.0) in a chemically defined medium and in mild acidic natural soil (pH 5.7). The phoQ mutant also exhibited increased swimming motility under acidic conditions. Acid resistance was restored in the mutant by introducing the phoQ gene on a plasmid. Three acid resistance genes, add, cfa, and fur were downregulated significantly, whereas the chaperone encoding gene, dnak, was upregulated when the phoQ mutant was exposed to acid stress. CONCLUSIONS This study suggested that the PhoP/PhoQ system positively regulates the acid resistance of R. aquatilis HX2.
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Affiliation(s)
- Jing Peng
- College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.,Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing 100193, China
| | - Zhongnan Xu
- College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.,Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing 100193, China
| | - Lei Li
- College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.,Institute of Vegetables and Flowers, Chinese Academy of Agricultural Science, Beijing 100081, China
| | - Bingjie Zhao
- College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.,Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing 100193, China
| | - Yanbin Guo
- College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.,Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing 100193, China
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Thakur R, Srivastava S, Yadav S. Multitrait Pseudomonas sp. isolated from the rhizosphere of Bergenia ciliata acts as a growth-promoting bioinoculant for plants. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2023. [DOI: 10.3389/fsufs.2023.1097587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Multifunctional plant growth-promoting bioinoculants are used to enhance growth, harvest yields, and add economic value to agricultural crops. In this study, such bioinoculant, BC-II-20 (Pseudomonas sp.), was isolated from the rhizospheric soil of a medicinal plant Bergenia ciliata from the Garhwal Himalayas, Uttarakhand, India. After characterization, supplementation with Pseudomonas sp. was used to study growth stimulation in a commercially important medicinal plant, Andrographis paniculata (Kalmegh), and it depicted enhanced physiological growth parameters under controlled conditions. Bacterial seed priming and also supplementation led to early and increased germination and plants displayed better vegetative growth during the entire growth stages. Early initiation of flowers and the appearance of pods occurred in inoculated plants, ultimately leading to the reduction in the life cycle of the plant. At the time of harvesting, there was an increase in the physiological parameters such as shoot length (38%), root length (14%), fresh weight (57%), dry weight (60%), number of panicles, and root branching. Photosynthetic efficiency was also higher, and ultimately, overall plant growth was improved by bacterial inoculation. The eco-friendly and sustainable use of this bioinoculant will provide an alternative to harmful chemical fertilizers and has become increasingly important. In conclusion, we reported a promising bioinoculant having plant growth-promoting traits, which promotes growth and development in A. paniculata and may be applied to other plants also.
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Gou Z, Zheng H, He Z, Su Y, Chen S, Chen H, Chen G, Ma NL, Sun Y. The combined action of biochar and nitrogen-fixing bacteria on microbial and enzymatic activities of soil N cycling. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 317:120790. [PMID: 36460190 DOI: 10.1016/j.envpol.2022.120790] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 11/04/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
This study aims to investigate the positive effects of the combined use of Enterobacter cloacae and biochar on improving nitrogen (N) utilization. The greenhouse pots experimental results showed the synergy of biochar and E. cloacae increased soil total N content and plant N uptake by 33.54% and 15.1%, respectively. Soil nitrogenase (NIT) activity increased by 253.02%. Ammonia monooxygenase (AMO) and nitrate reductase (NR) activity associated with nitrification and denitrification decreased by 10.94% and 29.09%, respectively. The relative abundance of N fixing microorganisms like Burkholderia and Bradyrhizobium significantly increased. Sphingomonas and Ottowia, two bacteria involved in the nitrification and denitrification processes, were found to be in lower numbers. The E. cloacae's ability to fix N2 and promote the growth of plants allow the retention of N in soil and make more N available for plant development. Biochar served as a reservoir of N for plants by adsorbing N from the soil and providing a shelter for E. cloacae. Thus, biochar and E. cloacae form a synergy for the management of agricultural N and the mitigation of negative impacts of pollution caused by excessive use of N fertilizer.
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Affiliation(s)
- Zechang Gou
- Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, College of Life Sciences, Jilin Agricultural University, Changchun, 130118, China
| | - Haoyu Zheng
- Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, College of Life Sciences, Jilin Agricultural University, Changchun, 130118, China
| | - Ziqi He
- Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, College of Life Sciences, Jilin Agricultural University, Changchun, 130118, China
| | - Yingjie Su
- Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, College of Life Sciences, Jilin Agricultural University, Changchun, 130118, China
| | - Siji Chen
- Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, College of Life Sciences, Jilin Agricultural University, Changchun, 130118, China
| | - Huan Chen
- Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, College of Life Sciences, Jilin Agricultural University, Changchun, 130118, China
| | - Guang Chen
- Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, College of Life Sciences, Jilin Agricultural University, Changchun, 130118, China
| | - Nyuk Ling Ma
- Faculty of Science and Marine Environment, University Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia
| | - Yang Sun
- Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, College of Life Sciences, Jilin Agricultural University, Changchun, 130118, China.
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Neelam A, Tabassum S. Optical Sensing Technologies to Elucidate the Interplay between Plant and Microbes. MICROMACHINES 2023; 14:195. [PMID: 36677256 PMCID: PMC9866067 DOI: 10.3390/mi14010195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/08/2023] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
Plant-microbe interactions are critical for ecosystem functioning and driving rhizosphere processes. To fully understand the communication pathways between plants and rhizosphere microbes, it is crucial to measure the numerous processes that occur in the plant and the rhizosphere. The present review first provides an overview of how plants interact with their surrounding microbial communities, and in turn, are affected by them. Next, different optical biosensing technologies that elucidate the plant-microbe interactions and provide pathogenic detection are summarized. Currently, most of the biosensors used for detecting plant parameters or microbial communities in soil are centered around genetically encoded optical and electrochemical biosensors that are often not suitable for field applications. Such sensors require substantial effort and cost to develop and have their limitations. With a particular focus on the detection of root exudates and phytohormones under biotic and abiotic stress conditions, novel low-cost and in-situ biosensors must become available to plant scientists.
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Rojas-Solis D, Larsen J, Lindig-Cisneros R. Arsenic and mercury tolerant rhizobacteria that can improve phytoremediation of heavy metal contaminated soils. PeerJ 2023; 11:e14697. [PMID: 36650835 PMCID: PMC9840862 DOI: 10.7717/peerj.14697] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 12/14/2022] [Indexed: 01/13/2023] Open
Abstract
Background Mining deposits often contain high levels of toxic elements such as mercury (Hg) and arsenic (As) representing strong environmental hazards. The purpose of this study was the isolation for plant growth promoting bacteria (PGPBs) that can improve phytoremediation of such mine waste deposits. Methods We isolated native soil bacteria from the rhizosphere of plants of mine waste deposits and agricultural land that was previously mine tailings from Tlalpujahua Michoacán, Mexico, and were identified by their fatty acid profile according to the MIDI Sherlock system. Plant growth promoting traits of all bacterial isolates were examined including production of 3-indoleacetic acid (IAA), siderophores, biofilm formation, and phosphate solubilization. Finally, the response of selected bacteria to mercury and arsenic was examined an in-vitro assay. Results A total 99 bacterial strains were isolated and 48 identified, representing 34 species belonging to 23 genera. Sixty six percent of the isolates produced IAA of which Pseudomonas fluorescens TL97 produced the most. Herbaspirillum huttiense TL36 performed best in terms of phosphate solubilization and production of siderophores. In terms of biofilm formation, Bacillus atrophaeus TL76 was the best. Discussion Most of the bacteria isolates showed high level of tolerance to the arsenic (as HAsNa2O4 and AsNaO2), whereas most isolates were susceptible to HgCl2. Three of the selected bacteria with PGP traits Herbispirillum huttiense TL36, Klebsiella oxytoca TL49 and Rhizobium radiobacter TL52 were also tolerant to high concentrations of mercury chloride, this might could be used for restoring or phytoremediating the adverse environmental conditions present in mine waste deposits.
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Xia Y, Zhang H, Zhang Y, Zhang Y, Liu J, Seviour R, Kong Y. Screening plant growth-promoting bacteria from the rhizosphere of invasive weed Ageratina adenophora for crop growth. PeerJ 2023; 11:e15064. [PMID: 36923499 PMCID: PMC10010174 DOI: 10.7717/peerj.15064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 02/22/2023] [Indexed: 03/12/2023] Open
Abstract
Plant-growth promoting rhizobacteria (PGPR) play a vital role in soil fertility and crop production. The rhizosphere of many crop plants has been well documented by screening PGPR for their plant-growth promoting (PGP) mechanisms. However, the rhizosphere of grass species that may act as potential habitats for novel PGPR remains relatively unexplored. Ageratina adenophora is a noxious weed that has invaded more than 40 tropical and subtropical countries in Asia, Oceania, Africa, and Europe. Its presence has led to changes in plant species composition, reducing their biodiversity and destroying ecosystem function. In this study, we screened 1,200 bacterial strains isolated from the rhizosphere soil of A. adenophora in three floristic regions in Yunnan Province, China. Samples were screened for their in vitro ability for N-fixation, production of the plant growth regulator indole-3-acetic acid (IAA), and the synthesis of 1-amino-cyclopropane-1-carboxylate (ACC) deaminase, which controls the levels of ethylene in developing plant roots. We found that 144 strains showed at least one of these PGP attributes. 16S rRNA gene sequencing showed that most (62.5%) of the samples were bacteria closely related to members of the genera Pseudomonas (27 strains), Providencia (20 strains), Chryseobacterium (14 strains), Ensifer (12 strains), Enterobacter (nine strains), and Hafnia (eight strains). Their abundance and biodiversity in the soil of individual floristic regions correlate positively with the invasion history of A. adenophora. From these PGP bacterial strains, KM_A34 (Pantoea agglomerans), KM_C04 (Enterobacter asburiae), and KM_A57 (Pseudomonas putida), which had the greatest in vitro ability of N-fixation, and IAA and ACC deaminase production, respectively, were selected. The strains were evaluated for their effect on the seed germination and growth of soybean, faba bean, pea, wheat, and Chinese cabbage other than A. adenophora. Chamber experiments showed these strains significantly (P < 0.05) increased (14.2-43.4% over the controls) germination rates of the soybean, faba bean, pea, and/or Chinese cabbage seeds. They also reduced relative seed germination times (20.8-48.8% over the controls) of soy bean, faba bean and/or wheat seeds. Greenhouse pot experiments showed that they significantly (P < 0.05) promoted the aboveground and belowground height of plant foliage (12.1-23.1% and 11.5-31.4% over the controls, respectively) and/or the dry weights (16.1-33.5% and 10.6-23.4% over the controls, respectively) of the soy bean, faba bean, pea, wheat and/or Chinese cabbage. These data indicate that the rhizosphere microbiota of A. adenophora contain a PGPR pool that may be used as bioinoculants to improve the growth and productivity of these crops.
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Affiliation(s)
- Yun Xia
- Yunnan Urban Agricultural Engineering & Technological Research Centre, Kunming University, Kunming, Yunnan, China.,School of Agriculture and Biotechnology, Kunming University, Kunming, Yunnan, China
| | - Hongbo Zhang
- School of Agriculture and Biotechnology, Kunming University, Kunming, Yunnan, China
| | - Yu Zhang
- School of Agriculture and Biotechnology, Kunming University, Kunming, Yunnan, China
| | - Yuyu Zhang
- School of Agriculture and Biotechnology, Kunming University, Kunming, Yunnan, China
| | - Jiani Liu
- School of Agriculture and Biotechnology, Kunming University, Kunming, Yunnan, China
| | - Robert Seviour
- Microbiology Department, La Trobe University, Bundoora, Victoria, Australia
| | - Yunhong Kong
- Kunming Key laboratory of Hydro-ecology Restoration of Dianchi Lake, Kunming University, Kunming, Yunnan, China
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Meena M, Mehta T, Nagda A, Yadav G, Sonigra P. PGPR-mediated synthesis and alteration of different secondary metabolites during plant-microbe interactions. PLANT-MICROBE INTERACTION - RECENT ADVANCES IN MOLECULAR AND BIOCHEMICAL APPROACHES 2023:229-255. [DOI: 10.1016/b978-0-323-91875-6.00002-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
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Melini F, Luziatelli F, Bonini P, Ficca AG, Melini V, Ruzzi M. Optimization of the growth conditions through response surface methodology and metabolomics for maximizing the auxin production by Pantoea agglomerans C1. Front Microbiol 2023; 14:1022248. [PMID: 36970660 PMCID: PMC10030972 DOI: 10.3389/fmicb.2023.1022248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 02/17/2023] [Indexed: 03/29/2023] Open
Abstract
Introduction The fermentative production of auxin/indole 3-acetate (IAA) using selected Pantoea agglomerans strains can be a promising approach to developing novel plant biostimulants for agriculture use. Methods By integrating metabolomics and fermentation technologies, this study aimed to define the optimal culture conditions to obtain auxin/IAA-enriched plant postbiotics using P. agglomerans strain C1. Metabolomics analysis allowed us to demonstrate that the production of a selected. Results and discussion Array of compounds with plant growth-promoting- (IAA and hypoxanthine) and biocontrol activity (NS-5, cyclohexanone, homo-L-arginine, methyl hexadecenoic acid, and indole-3-carbinol) can be stimulated by cultivating this strain on minimal saline medium amended with sucrose as a carbon source. We applied a three-level-two-factor central composite design (CCD) based response surface methodology (RSM) to explore the impact of the independent variables (rotation speed and medium liquid-to-flask volume ratio) on the production of IAA and IAA precursors. The ANOVA component of the CCD indicated that all the process-independent variables investigated significantly impacted the auxin/IAA production by P. agglomerans strain C1. The optimum values of variables were a rotation speed of 180 rpm and a medium liquid-to-flask volume ratio of 1:10. Using the CCD-RSM method, we obtained a maximum indole auxin production of 208.3 ± 0.4 mg IAAequ/L, which was a 40% increase compared to the growth conditions used in previous studies. Targeted metabolomics allowed us to demonstrate that the IAA product selectivity and the accumulation of the IAA precursor indole-3-pyruvic acid were significantly affected by the increase in the rotation speed and the aeration efficiency.
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Affiliation(s)
- Francesca Melini
- Department for Innovation in Biological, Agrofood and Forest Systems, University of Tuscia, Viterbo, Italy
- CREA Research Centre for Food and Nutrition, Rome, Italy
| | - Francesca Luziatelli
- Department for Innovation in Biological, Agrofood and Forest Systems, University of Tuscia, Viterbo, Italy
- *Correspondence: Francesca Luziatelli, ; Maurizio Ruzzi,
| | | | - Anna Grazia Ficca
- Department for Innovation in Biological, Agrofood and Forest Systems, University of Tuscia, Viterbo, Italy
| | | | - Maurizio Ruzzi
- Department for Innovation in Biological, Agrofood and Forest Systems, University of Tuscia, Viterbo, Italy
- *Correspondence: Francesca Luziatelli, ; Maurizio Ruzzi,
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Saadouli I, Marasco R, Mejri L, Hamden H, Guerfali MM, Stathopoulou P, Daffonchio D, Cherif A, Ouzari HI, Tsiamis G, Mosbah A. Diversity and adaptation properties of actinobacteria associated with Tunisian stone ruins. Front Microbiol 2022; 13:997832. [PMID: 36583041 PMCID: PMC9793712 DOI: 10.3389/fmicb.2022.997832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 11/16/2022] [Indexed: 12/15/2022] Open
Abstract
Stone surface is a unique biological niche that may host a rich microbial diversity. The exploration of the biodiversity of the stone microbiome represents a major challenge and an opportunity to characterize new strains equipped with valuable biological activity. Here, we explored the diversity and adaptation strategies of total bacterial communities associated with Roman stone ruins in Tunisia by considering the effects of geo-climatic regions and stone geochemistry. Environmental 16S rRNA gene amplicon was performed on DNA extracted from stones samples collected in three different sampling sites in Tunisia, along an almost 400km aridity transect, encompassing Mediterranean, semiarid and arid climates. The library was sequenced on an Illumina MiSeq sequencing platform. The cultivable Actinobacteria were isolated from stones samples using the dilution plate technique. A total of 71 strains were isolated and identified based on 16S rRNA gene sequences. Cultivable actinobacteria were further investigated to evaluate the adaptative strategies adopted to survive in/on stones. Amplicon sequencing showed that stone ruins bacterial communities were consistently dominated by Cyanobacteria, followed by Proteobacteria and Actinobacteria along the aridity gradient. However, the relative abundance of the bacterial community components changed according to the geo-climatic origin. Stone geochemistry, particularly the availability of magnesium, chromium, and copper, also influenced the bacterial communities' diversity. Cultivable actinobacteria were further investigated to evaluate the adaptative strategies adopted to survive in/on stones. All the cultivated bacteria belonged to the Actinobacteria class, and the most abundant genera were Streptomyces, Kocuria and Arthrobacter. They were able to tolerate high temperatures (up to 45°C) and salt accumulation, and they produced enzymes involved in nutrients' solubilization, such as phosphatase, amylase, protease, chitinase, and cellulase. Actinobacteria members also had an important role in the co-occurrence interactions among bacteria, favoring the community interactome and stabilization. Our findings provide new insights into actinobacteria's diversity, adaptation, and role within the microbiome associated with stone ruins.
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Affiliation(s)
- Ilhem Saadouli
- Laboratory of Microorganisms and Active Biomolecules, LMBA-LR03ES03, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis, Tunisia
| | - Ramona Marasco
- Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Lassaad Mejri
- Laboratory “Energy and Matter for Development of Nuclear Sciences” (LR16CNSTN02), National Center for Nuclear Sciences and Technology, Sidi Thabet Technopark, Sidi Thabet, Tunisia
| | - Haytham Hamden
- Laboratory of Biotechnology and Nuclear Technologies, LR16CNSTN02, National Centre of Nuclear Sciences and Technologies, Sidi Thabet, Tunisia
| | - Meriem M’saad Guerfali
- Laboratory of Biotechnology and Nuclear Technologies, LR16CNSTN02, National Centre of Nuclear Sciences and Technologies, Sidi Thabet, Tunisia
| | - Panagiota Stathopoulou
- Laboratory of Systems Microbiology and Applied Genomics, Department of Sustainable Agriculture, University of Patras, Agrinio, Greece
| | - Daniele Daffonchio
- Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Ameur Cherif
- BVBGR-LR11ES31, Higher Institute of Biotechnology Sidi Thabet, University of Manouba, Biotechpole Sidi Thabet, Ariana, Tunisia
| | - Hadda-Imene Ouzari
- Laboratory of Microorganisms and Active Biomolecules, LMBA-LR03ES03, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis, Tunisia,*Correspondence: Hadda-Imene Ouzari,
| | - George Tsiamis
- Laboratory of Systems Microbiology and Applied Genomics, Department of Sustainable Agriculture, University of Patras, Agrinio, Greece,George Tsiamis,
| | - Amor Mosbah
- BVBGR-LR11ES31, Higher Institute of Biotechnology Sidi Thabet, University of Manouba, Biotechpole Sidi Thabet, Ariana, Tunisia,Amor Mosbah,
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Zhao D, Jiao J, Du B, Liu K, Wang C, Ding Y. Volatile organic compounds from Lysinibacillus macroides regulating the seedling growth of Arabidopsis thaliana. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2022; 28:1997-2009. [PMID: 36573143 PMCID: PMC9789275 DOI: 10.1007/s12298-022-01268-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 12/09/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Volatile organic compounds (VOCs) have the characteristics of long distance propagation, low concentration, perception, and indirect contact between organisms. In this experiment, Lysinibacillus macroides Xi9 was isolated from cassava residue, and the VOCs produced by this strain were analyzed by the SPME-GC-MS method, mainly including alcohols, esters, and alkanes. By inoculation of L. macroides Xi9, VOCs can promote the growth and change the root-system architecture of Arabidopsis seedlings. The results showed that the number of lateral roots, root density, and fresh weight of Arabidopsis seedlings were significantly higher (p ≤ 0.01), and the number of roots hair was also increased after exposure to strain Xi9. Compared with the control group, the transcriptome analysis of Arabidopsis seedlings treated with strain Xi9 for 5 days revealed a total of 508 genes differentially expressed (p < 0.05). After Gene Ontology enrichment analysis, it was found that genes encoding nitrate transport and assimilation, and the lateral root-related gene ANR1 were up-regulated. The content of NO3 - and amino acid in Arabidopsis seedlings were significantly higher from control group (p ≤ 0.01). Plant cell wall-related EXPA family genes and pectin lyase gene were up-regulated, resulting cell elongation of leaf. SAUR41 and up-regulation of its subfamily members, as well as the down-regulation of auxin efflux carrier protein PILS5 and auxin response factor 20 (ARF20) led to the accumulation of auxin. These results indicated that VOCs of strain Xi9 promote Arabidopsis seedlings growth and development by promoting nitrogen uptake, regulating auxin synthesis, and improving cell wall modification. Supplementary Information The online version contains supplementary material available at 10.1007/s12298-022-01268-3.
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Affiliation(s)
- Dongying Zhao
- College of Life Sciences, Shandong Agricultural University, Tai’an, 271018 China
| | - Junhui Jiao
- College of Life Sciences, Shandong Agricultural University, Tai’an, 271018 China
| | - Binghai Du
- College of Life Sciences, Shandong Agricultural University, Tai’an, 271018 China
- Shandong Key Laboratory of Agricultural Microbiology, Tai’an, 271018 China
- Shandong Engineering Research Center of Plant-Microbia Restoration for Saline-Alkali Land, Tai’an, 271018 China
| | - Kai Liu
- College of Life Sciences, Shandong Agricultural University, Tai’an, 271018 China
- Shandong Key Laboratory of Agricultural Microbiology, Tai’an, 271018 China
| | - Chengqiang Wang
- College of Life Sciences, Shandong Agricultural University, Tai’an, 271018 China
- Shandong Key Laboratory of Agricultural Microbiology, Tai’an, 271018 China
| | - Yanqin Ding
- College of Life Sciences, Shandong Agricultural University, Tai’an, 271018 China
- Shandong Key Laboratory of Agricultural Microbiology, Tai’an, 271018 China
- Shandong Engineering Research Center of Plant-Microbia Restoration for Saline-Alkali Land, Tai’an, 271018 China
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