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Zhuang Y, Wang H, Tan F, Wu B, Liu L, Qin H, Yang Z, He M. Rhizosphere metabolic cross-talk from plant-soil-microbe tapping into agricultural sustainability: Current advance and perspectives. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 210:108619. [PMID: 38604013 DOI: 10.1016/j.plaphy.2024.108619] [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: 12/06/2023] [Revised: 03/21/2024] [Accepted: 04/08/2024] [Indexed: 04/13/2024]
Abstract
Rhizosphere interactions from plant-soil-microbiome occur dynamically all the time in the "black microzone" underground, where we can't see intuitively. Rhizosphere metabolites including root exudates and microbial metabolites act as various chemical signalings involving in rhizosphere interactions, and play vital roles on plant growth, development, disease suppression and resistance to stress conditions as well as proper soil health. Although rhizosphere metabolites are a mixture from plant roots and soil microbes, they often are discussed alone. As a rapid appearance of various omics platforms and analytical methods, it offers possibilities and opportunities for exploring rhizosphere interactions in unprecedented breadth and depth. However, our comprehensive understanding about the fine-tuning mechanisms of rhizosphere interactions mediated by these chemical compounds still remain clear. Thus, this review summarizes recent advances systemically including the features of rhizosphere metabolites and their effects on rhizosphere ecosystem, and looks forward to the future research perspectives, which contributes to facilitating better understanding of biochemical communications belowground and helping identify novel rhizosphere metabolites. We also address challenges for promoting the understanding about the roles of rhizosphere metabolites in different environmental stresses.
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Affiliation(s)
- Yong Zhuang
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chinese Academy of Agricultural Sciences, 610041, Chengdu, China.
| | - Hao Wang
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chinese Academy of Agricultural Sciences, 610041, Chengdu, China
| | - Furong Tan
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chinese Academy of Agricultural Sciences, 610041, Chengdu, China
| | - Bo Wu
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chinese Academy of Agricultural Sciences, 610041, Chengdu, China
| | - Linpei Liu
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chinese Academy of Agricultural Sciences, 610041, Chengdu, China
| | - Han Qin
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chinese Academy of Agricultural Sciences, 610041, Chengdu, China
| | - ZhiJuan Yang
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chinese Academy of Agricultural Sciences, 610041, Chengdu, China
| | - Mingxiong He
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chinese Academy of Agricultural Sciences, 610041, Chengdu, China.
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2
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Etesami H, Glick BR. Bacterial indole-3-acetic acid: A key regulator for plant growth, plant-microbe interactions, and agricultural adaptive resilience. Microbiol Res 2024; 281:127602. [PMID: 38228017 DOI: 10.1016/j.micres.2024.127602] [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: 11/29/2023] [Revised: 01/02/2024] [Accepted: 01/03/2024] [Indexed: 01/18/2024]
Abstract
Indole-3-acetic acid (IAA), a fundamental phytohormone categorized under auxins, not only influences plant growth and development but also plays a critical role in plant-microbe interactions. This study reviews the role of IAA in bacteria-plant communication, with a focus on its biosynthesis, regulation, and the subsequent effects on host plants. Bacteria synthesize IAA through multiple pathways, which include the indole-3-acetamide (IAM), indole-3-pyruvic acid (IPyA), and several other routes, whose full mechanisms remain to be fully elucidated. The production of bacterial IAA affects root architecture, nutrient uptake, and resistance to various abiotic stresses such as drought, salinity, and heavy metal toxicity, enhancing plant resilience and thus offering promising routes to sustainable agriculture. Bacterial IAA synthesis is regulated through complex gene networks responsive to environmental cues, impacting plant hormonal balances and symbiotic relationships. Pathogenic bacteria have adapted mechanisms to manipulate the host's IAA dynamics, influencing disease outcomes. On the other hand, beneficial bacteria utilize IAA to promote plant growth and mitigate abiotic stresses, thereby enhancing nutrient use efficiency and reducing dependency on chemical fertilizers. Advancements in analytical methods, such as liquid chromatography-tandem mass spectrometry, have improved the quantification of bacterial IAA, enabling accurate measurement and analysis. Future research focusing on molecular interactions between IAA-producing bacteria and host plants could facilitate the development of biotechnological applications that integrate beneficial bacteria to improve crop performance, which is essential for addressing the challenges posed by climate change and ensuring global food security. This integration of bacterial IAA producers into agricultural practice promises to revolutionize crop management strategies by enhancing growth, fostering resilience, and reducing environmental impact.
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Affiliation(s)
- Hassan Etesami
- Soil Science Department, University of Tehran, Tehran, Iran.
| | - Bernard R Glick
- Department of Biology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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3
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Ragland CJ, Shih KY, Dinneny JR. Choreographing root architecture and rhizosphere interactions through synthetic biology. Nat Commun 2024; 15:1370. [PMID: 38355570 PMCID: PMC10866969 DOI: 10.1038/s41467-024-45272-5] [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: 07/17/2023] [Accepted: 01/18/2024] [Indexed: 02/16/2024] Open
Abstract
Climate change is driving extreme changes to the environment, posing substantial threats to global food security and bioenergy. Given the direct role of plant roots in mediating plant-environment interactions, engineering the form and function of root systems and their associated microbiota may mitigate these effects. Synthetic genetic circuits have enabled sophisticated control of gene expression in microbial systems for years and a surge of advances has heralded the extension of this approach to multicellular plant species. Targeting these tools to affect root structure, exudation, and microbe activity on root surfaces provide multiple strategies for the advancement of climate-ready crops.
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Affiliation(s)
- Carin J Ragland
- Department of Biology, Stanford University, Stanford, CA, 94305, USA
| | - Kevin Y Shih
- Department of Biology, Stanford University, Stanford, CA, 94305, USA
| | - José R Dinneny
- Department of Biology, Stanford University, Stanford, CA, 94305, USA.
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4
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Valencia-Marin MF, Chávez-Avila S, Guzmán-Guzmán P, Orozco-Mosqueda MDC, de Los Santos-Villalobos S, Glick BR, Santoyo G. Survival strategies of Bacillus spp. in saline soils: Key factors to promote plant growth and health. Biotechnol Adv 2024; 70:108303. [PMID: 38128850 DOI: 10.1016/j.biotechadv.2023.108303] [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: 08/16/2023] [Revised: 11/16/2023] [Accepted: 12/12/2023] [Indexed: 12/23/2023]
Abstract
Soil salinity is one of the most important abiotic factors that affects agricultural production worldwide. Because of saline stress, plants face physiological changes that have negative impacts on the various stages of their development, so the employment of plant growth-promoting bacteria (PGPB) is one effective means to reduce such toxic effects. Bacteria of the Bacillus genus are excellent PGPB and have been extensively studied, but what traits makes them so extraordinary to adapt and survive under harsh situations? In this work we review the Bacillus' innate abilities to survive in saline stressful soils, such as the production osmoprotectant compounds, antioxidant enzymes, exopolysaccharides, and the modification of their membrane lipids. Other survival abilities are also discussed, such as sporulation or a reduced growth state under the scope of a functional interaction in the rhizosphere. Thus, the most recent evidence shows that these saline adaptive activities are important in plant-associated bacteria to potentially protect, direct and indirect plant growth-stimulating activities. Additionally, recent advances on the mechanisms used by Bacillus spp. to improve the growth of plants under saline stress are addressed, including genomic and transcriptomic explorations. Finally, characterization and selection of Bacillus strains with efficient survival strategies are key factors in ameliorating saline problems in agricultural production.
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Affiliation(s)
- María F Valencia-Marin
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Mich. 58030, Mexico
| | - Salvador Chávez-Avila
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Mich. 58030, Mexico
| | - Paulina Guzmán-Guzmán
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Mich. 58030, Mexico
| | - Ma Del Carmen Orozco-Mosqueda
- Departamento de Ingeniería Bioquímica y Ambiental, Tecnológico Nacional de México en Celaya, 38010 Celaya, Gto, Mexico
| | | | - Bernard R Glick
- Department of Biology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Gustavo Santoyo
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Mich. 58030, Mexico.
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5
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Sharma A, Choudhary P, Chakdar H, Shukla P. Molecular insights and omics-based understanding of plant-microbe interactions under drought stress. World J Microbiol Biotechnol 2023; 40:42. [PMID: 38105277 DOI: 10.1007/s11274-023-03837-4] [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: 09/29/2023] [Accepted: 11/11/2023] [Indexed: 12/19/2023]
Abstract
The detrimental effects of adverse environmental conditions are always challenging and remain a major concern for plant development and production worldwide. Plants deal with such constraints by physiological, biochemical, and morphological adaptations as well as acquiring mutual support of beneficial microorganisms. As many stress-responsive traits of plants are influenced by microbial activities, plants have developed a sophisticated interaction with microbes to cope with adverse environmental conditions. The production of numerous bioactive metabolites by rhizospheric, endo-, or epiphytic microorganisms can directly or indirectly alter the root system architecture, foliage production, and defense responses. Although plant-microbe interactions have been shown to improve nutrient uptake and stress resilience in plants, the underlying mechanisms are not fully understood. "Multi-omics" application supported by genomics, transcriptomics, and metabolomics has been quite useful to investigate and understand the biochemical, physiological, and molecular aspects of plant-microbe interactions under drought stress conditions. The present review explores various microbe-mediated mechanisms for drought stress resilience in plants. In addition, plant adaptation to drought stress is discussed, and insights into the latest molecular techniques and approaches available to improve drought-stress resilience are provided.
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Affiliation(s)
- Aditya Sharma
- Enzyme Technology and Protein Bioinformatics Laboratory, School of Biotechnology, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, 221005, India
| | - Prassan Choudhary
- Microbial Technology Unit II, ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau, Uttar Pradesh, 275103, India
| | - Hillol Chakdar
- Microbial Technology Unit II, ICAR-National Bureau of Agriculturally Important Microorganisms (NBAIM), Mau, Uttar Pradesh, 275103, India
| | - Pratyoosh Shukla
- Enzyme Technology and Protein Bioinformatics Laboratory, School of Biotechnology, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, 221005, India.
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6
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Tamang A, Swarnkar M, Kumar P, Kumar D, Pandey SS, Hallan V. Endomicrobiome of in vitro and natural plants deciphering the endophytes-associated secondary metabolite biosynthesis in Picrorhiza kurrooa, a Himalayan medicinal herb. Microbiol Spectr 2023; 11:e0227923. [PMID: 37811959 PMCID: PMC10715050 DOI: 10.1128/spectrum.02279-23] [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: 06/01/2023] [Accepted: 08/25/2023] [Indexed: 10/10/2023] Open
Abstract
IMPORTANCE Picrorhiza kurrooa is a major source of picrosides, potent hepatoprotective molecules. Due to the ever-increasing demands, overexploitation has caused an extensive decline in its population in the wild and placed it in the endangered plants' category. At present plant in-vitro systems are widely used for the sustainable generation of P. kurrooa plants, and also for the conservation of other commercially important, rare, endangered, and threatened plant species. Furthermore, the in-vitro-generated plants had reduced content of therapeutic secondary metabolites compared to their wild counterparts, and the reason behind, not well-explored. Here, we revealed the loss of plant-associated endophytic communities during in-vitro propagation of P. kurrooa plants which also correlated to in-planta secondary metabolite biosynthesis. Therefore, this study emphasized to consider the essential role of plant-associated endophytic communities in in-vitro practices which may be the possible reason for reduced secondary metabolites in in-vitro plants.
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Affiliation(s)
- Anish Tamang
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology (IHBT), Palampur, Himachal Pradesh, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad- 201002, India
| | - Mohit Swarnkar
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology (IHBT), Palampur, Himachal Pradesh, India
| | - Pawan Kumar
- Chemical Technology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
| | - Dinesh Kumar
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad- 201002, India
- Chemical Technology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
| | - Shiv Shanker Pandey
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology (IHBT), Palampur, Himachal Pradesh, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad- 201002, India
| | - Vipin Hallan
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology (IHBT), Palampur, Himachal Pradesh, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad- 201002, India
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7
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Tang L, Zhan L, Han Y, Wang Z, Dong L, Zhang Z. Microbial community assembly and functional profiles along the soil-root continuum of salt-tolerant Suaeda glauca and Suaeda salsa. FRONTIERS IN PLANT SCIENCE 2023; 14:1301117. [PMID: 38046600 PMCID: PMC10691491 DOI: 10.3389/fpls.2023.1301117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Accepted: 11/01/2023] [Indexed: 12/05/2023]
Abstract
Developing and planting salt-tolerant plants has become a promising way to utilize saline-alkali land resources and ensure food security. Root-associated microbes of salt-tolerant plants have been shown to promote plant growth and alleviate high salt stress, yet very little is known about the salt resistance mechanisms of core microbes in different niches. This study characterized the microbial community structures, assembly processes, and functional profiles in four root-related compartments of two salt-tolerant plants by amplicon and shotgun metagenomic sequencing. The results showed that both plants significantly altered the microbial community structure of saline soils, with greater microbial alpha diversity in the rhizosphere or rhizoplane compared with bulk soils. Stochastic process dominated the microbial assembly processes, and the impact was stronger in Suaeda salsa than in S. glauca, indicating that S. salsa may have stronger resistance abilities to changing soil properties. Keystone species, such as Pseudomonas in the endosphere of S. glauca and Sphingomonas in the endosphere of S. salsa, which may play key roles in helping plants alleviate salt stress, were identified by using microbial co-occurrence network analysis. Furthermore, the microbiomes in the rhizoplane soils had more abundant genes involved in promoting growth of plants and defending against salt stress than those in bulk soils, especially in salt-tolerant S. salsa. Moreover, microbes in the rhizoplane of S. salsa exhibited higher functional diversities, with notable enrichment of genes involved in carbon fixation, dissimilar nitrate reduction to ammonium, and sulfite oxidation. These findings revealed differences and similarities in the microbial community assembly, functional profiles and keystone species closely related to salt alleviation of the two salt-tolerant plants. Overall, our study provides new insights into the ecological functions and varied strategies of rhizosphere microbes in different plants under salt stress and highlights the potential use of keystone microbes for enhancing salt resistance of plants.
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Affiliation(s)
- Luyao Tang
- School of Pharmacy, Weifang Medical University, Weifang, Shandong, China
| | - Le Zhan
- School of Pharmacy, Weifang Medical University, Weifang, Shandong, China
| | - Yanan Han
- Key Laboratory of Biological Medicines in Universities of Shandong Province, Weifang Key Laboratory of Antibody Medicines, School of Life Science and Technology, Weifang Medical University, Weifang, Shandong, China
| | - Zhengran Wang
- School of Pharmacy, Weifang Medical University, Weifang, Shandong, China
| | - Lei Dong
- School of Pharmacy, Weifang Medical University, Weifang, Shandong, China
| | - Zhong Zhang
- Key Laboratory of Biological Medicines in Universities of Shandong Province, Weifang Key Laboratory of Antibody Medicines, School of Life Science and Technology, Weifang Medical University, Weifang, Shandong, China
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8
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Al-Turki A, Murali M, Omar AF, Rehan M, Sayyed R. Recent advances in PGPR-mediated resilience toward interactive effects of drought and salt stress in plants. Front Microbiol 2023; 14:1214845. [PMID: 37829451 PMCID: PMC10565232 DOI: 10.3389/fmicb.2023.1214845] [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: 04/30/2023] [Accepted: 09/07/2023] [Indexed: 10/14/2023] Open
Abstract
The present crisis at hand revolves around the need to enhance plant resilience to various environmental stresses, including abiotic and biotic stresses, to ensure sustainable agriculture and mitigate the impact of climate change on crop production. One such promising approach is the utilization of plant growth-promoting rhizobacteria (PGPR) to mediate plant resilience to these stresses. Plants are constantly exposed to various stress factors, such as drought, salinity, pathogens, and nutrient deficiencies, which can significantly reduce crop yield and quality. The PGPR are beneficial microbes that reside in the rhizosphere of plants and have been shown to positively influence plant growth and stress tolerance through various mechanisms, including nutrient solubilization, phytohormone production, and induction of systemic resistance. The review comprehensively examines the various mechanisms through which PGPR promotes plant resilience, including nutrient acquisition, hormonal regulation, and defense induction, focusing on recent research findings. The advancements made in the field of PGPR-mediated resilience through multi-omics approaches (viz., genomics, transcriptomics, proteomics, and metabolomics) to unravel the intricate interactions between PGPR and plants have been discussed including their molecular pathways involved in stress tolerance. Besides, the review also emphasizes the importance of continued research and implementation of PGPR-based strategies to address the pressing challenges facing global food security including commercialization of PGPR-based bio-formulations for sustainable agricultural.
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Affiliation(s)
- Ahmad Al-Turki
- Department of Plant Production and Protection, College of Agriculture and Veterinary Medicine, Qassim University, Buraydah, Saudi Arabia
| | - M. Murali
- Department of Studies in Botany, University of Mysore, Mysore, India
| | - Ayman F. Omar
- Department of Plant Production and Protection, College of Agriculture and Veterinary Medicine, Qassim University, Buraydah, Saudi Arabia
- Department of Plant Pathology, Plant Pathology, and Biotechnology Lab. and EPCRS Excellence Center, Faculty of Agriculture, Kafrelsheikh University, Kafr El-Sheikh, Egypt
| | - Medhat Rehan
- Department of Plant Production and Protection, College of Agriculture and Veterinary Medicine, Qassim University, Buraydah, Saudi Arabia
- Department of Genetics, College of Agriculture, Kafrelsheikh University, Kafr El-Sheikh, Egypt
| | - R.Z. Sayyed
- Department of Microbiology, PSGVP Mandal’s S I Patil Arts, G B Patel Science and STKV Sangh Commerce College, Shahada, India
- Faculty of Health and Life Sciences, INTI International University, Nilai, Negeri Sembilan, Malaysia
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9
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Gamalero E, Lingua G, Glick BR. Ethylene, ACC, and the Plant Growth-Promoting Enzyme ACC Deaminase. BIOLOGY 2023; 12:1043. [PMID: 37626930 PMCID: PMC10452086 DOI: 10.3390/biology12081043] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 07/20/2023] [Accepted: 07/24/2023] [Indexed: 08/27/2023]
Abstract
Here, a brief summary of the biosynthesis of 1-aminocyclopropane-1-carboxylate (ACC) and ethylene in plants, as well as overviews of how ACC and ethylene act as signaling molecules in plants, is presented. Next, how the bacterial enzyme ACC deaminase cleaves plant-produced ACC and thereby decreases or prevents the ethylene or ACC modulation of plant gene expression is considered. A detailed model of ACC deaminase functioning, including the role of indoleacetic acid (IAA), is presented. Given that ACC is a signaling molecule under some circumstances, this suggests that ACC, which appears to have evolved prior to ethylene, may have been a major signaling molecule in primitive plants prior to the evolution of ethylene and ethylene signaling. Due to their involvement in stimulating ethylene production, the role of D-amino acids in plants is then considered. The enzyme D-cysteine desulfhydrase, which is structurally very similar to ACC deaminase, is briefly discussed and the possibility that ACC deaminase arose as a variant of D-cysteine desulfhydrase is suggested.
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Affiliation(s)
- Elisa Gamalero
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale T. Michel 11, 15121 Alessandria, Italy;
| | - Guido Lingua
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale T. Michel 11, 15121 Alessandria, Italy;
| | - Bernard R. Glick
- Department of Biology, University of Waterloo, Waterloo, ON N2L 3G1, Canada;
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10
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Mehmood N, Saeed M, Zafarullah S, Hyder S, Rizvi ZF, Gondal AS, Jamil N, Iqbal R, Ali B, Ercisli S, Kupe M. Multifaceted Impacts of Plant-Beneficial Pseudomonas spp. in Managing Various Plant Diseases and Crop Yield Improvement. ACS OMEGA 2023; 8:22296-22315. [PMID: 37396244 PMCID: PMC10308577 DOI: 10.1021/acsomega.3c00870] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 05/18/2023] [Indexed: 07/04/2023]
Abstract
The modern agricultural system has issues with the reduction of agricultural productivity due to a wide range of abiotic and biotic stresses. It is also expected that in the future the entire world population may rapidly increase and will surely demand more food. Farmers now utilize a massive quantity of synthetic fertilizers and pesticides for disease management and to increase food production. These synthetic fertilizers badly affect the environment, the texture of the soil, plant productivity, and human health. However, agricultural safety and sustainability depend on an ecofriendly and inexpensive biological application. In contrast to synthetic fertilizers, soil inoculation with plant-growth-promoting rhizobacteria (PGPR) is one of the excellent alternative options. In this regard, we focused on the best PGPR genera, Pseudomonas, which exists in the rhizosphere as well as inside the plant's body and plays a role in sustainable agriculture. Many Pseudomonas spp. control plant pathogens and play an effective role in disease management through direct and indirect mechanisms. Pseudomonas spp. fix the amount of atmospheric nitrogen, solubilize phosphorus and potassium, and also produce phytohormones, lytic enzymes, volatile organic compounds, antibiotics, and secondary metabolites during stress conditions. These compounds stimulate plant growth by inducing systemic resistance and by inhibiting the growth of pathogens. Furthermore, pseudomonads also protect plants during different stress conditions like heavy metal pollution, osmosis, temperature, oxidative stress, etc. Now, several Pseudomonas-based commercial biological control products have been promoted and marketed, but there are a few limitations that hinder the development of this technology for extensive usage in agricultural systems. The variability among the members of Pseudomonas spp. draws attention to the huge research interest in this genus. There is a need to explore the potential of native Pseudomonas spp. as biocontrol agents and to use them in biopesticide development to support sustainable agriculture.
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Affiliation(s)
- Najaf Mehmood
- Department
of Botany, Government College Women University
Sialkot, Sialkot 51310, Pakistan
| | - Mahnoor Saeed
- Department
of Botany, Government College Women University
Sialkot, Sialkot 51310, Pakistan
| | - Sana Zafarullah
- Department
of Botany, Government College Women University
Sialkot, Sialkot 51310, Pakistan
| | - Sajjad Hyder
- Department
of Botany, Government College Women University
Sialkot, Sialkot 51310, Pakistan
| | - Zarrin Fatima Rizvi
- Department
of Botany, Government College Women University
Sialkot, Sialkot 51310, Pakistan
| | - Amjad Shahzad Gondal
- Department
of Plant Pathology, Bahauddin Zakariya University, Multan 60000, Pakistan
| | - Nuzhat Jamil
- Department
of Botany, University of the Punjab, Quaid-i-Azam Campus, Lahore 54590, Pakistan
| | - Rashid Iqbal
- Department
of Agronomy, Faculty of Agriculture and Environment, The Islamia University of Bahawalpur Pakistan, Bahawalpur 63100, Pakistan
| | - Baber Ali
- Department
of Plant Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan
| | - Sezai Ercisli
- Department
of Horticulture, Faculty of Agriculture, Ataturk University, Erzurum 25240, Türkiye
- HGF
Agro, Ata Teknokent, Erzurum TR-25240, Türkiye
| | - Muhammed Kupe
- Department
of Horticulture, Faculty of Agriculture, Ataturk University, Erzurum 25240, Türkiye
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11
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Peng M, Jiang Z, Zhou F, Wang Z. From salty to thriving: plant growth promoting bacteria as nature's allies in overcoming salinity stress in plants. Front Microbiol 2023; 14:1169809. [PMID: 37426022 PMCID: PMC10327291 DOI: 10.3389/fmicb.2023.1169809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 06/09/2023] [Indexed: 07/11/2023] Open
Abstract
Soil salinity is one of the main problems that affects global crop yield. Researchers have attempted to alleviate the effects of salt stress on plant growth using a variety of approaches, including genetic modification of salt-tolerant plants, screening the higher salt-tolerant genotypes, and the inoculation of beneficial plant microbiome, such as plant growth-promoting bacteria (PGPB). PGPB mainly exists in the rhizosphere soil, plant tissues and on the surfaces of leaves or stems, and can promote plant growth and increase plant tolerance to abiotic stress. Many halophytes recruit salt-resistant microorganisms, and therefore endophytic bacteria isolated from halophytes can help enhance plant stress responses. Beneficial plant-microbe interactions are widespread in nature, and microbial communities provide an opportunity to understand these beneficial interactions. In this study, we provide a brief overview of the current state of plant microbiomes and give particular emphasis on its influence factors and discuss various mechanisms used by PGPB in alleviating salt stress for plants. Then, we also describe the relationship between bacterial Type VI secretion system and plant growth promotion.
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Affiliation(s)
- Mu Peng
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, China
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, China
| | - Zhihui Jiang
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, China
| | - Fangzhen Zhou
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, China
- College of Biological and Food Engineering, Hubei Minzu University, Enshi, China
| | - Zhiyong Wang
- Hubei Key Laboratory of Biological Resources Protection and Utilization, Hubei Minzu University, Enshi, China
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12
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Adedayo AA, Fadiji AE, Babalola OO. Unraveling the functional genes present in rhizosphere microbiomes of Solanum lycopersicum. PeerJ 2023; 11:e15432. [PMID: 37283894 PMCID: PMC10241170 DOI: 10.7717/peerj.15432] [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: 02/16/2023] [Accepted: 04/26/2023] [Indexed: 06/08/2023] Open
Abstract
The microbiomes living in the rhizosphere soil of the tomato plant contribute immensely to the state of health of the tomato plant alongside improving sustainable agriculture. With the aid of shotgun metagenomics sequencing, we characterized the putative functional genes (plant-growth-promoting and disease-resistant genes) produced by the microbial communities dwelling in the rhizosphere soil of healthy and powdery mildew-diseased tomato plants. The results identified twenty-one (21) plant growth promotion (PGP) genes in the microbiomes inhabiting the healthy rhizosphere (HR) which are more predomiant as compared to diseased rhizosphere (DR) that has nine (9) genes and four (4) genes in bulk soil (BR). Likewise, we identified some disease-resistant genes which include nucleotide binding genes and antimicrobial genes. Our study revealed fifteen (15) genes in HR which made it greater in comparison to DR that has three (3) genes and three (3) genes in bulk soil. Further studies should be conducted by isolating these microorganisms and introduce them to field experiments for cultivation of tomatoes.
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Shahid I, Han J, Hanook S, Borchers CH, El Enshasy HA, Mehnaz S. Genome mining of Pseudomonas spp. hints towards the production of under-pitched secondary metabolites. 3 Biotech 2023; 13:182. [PMID: 37193329 PMCID: PMC10182215 DOI: 10.1007/s13205-023-03607-x] [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: 01/09/2023] [Accepted: 05/03/2023] [Indexed: 05/18/2023] Open
Abstract
The recent advances in omics and computational analysis have enabled the capacity to identify the exclusive strain-specific metabolites and novel biosynthetic gene clusters. This study analyzed eight strains of P. aurantiaca including GS1, GS3, GS4, GS6, GS7, FS2, ARS38, PBSt2, one strain of P. chlororaphis RP4, one strain of P. aeruginosa (At1RP4), and one strain of P. fluorescens (RS1) for the production of rhamnolipids, quorum-sensing signals, and osmolytes. Seven rhamnolipid derivatives were variably detected in fluorescent pseudomonads. These rhamnolipids included Rha-C10-C8, Rha-Rha-C10-C10, Rha-C10-C12db, Rha-C10-C10, Rha-Rha-C10-C12, Rha-C10-C12, and Rha-Rha-C10-C12db. Pseudomonas spp. also showed the variable production of osmoprotectants including N-acetyl glutaminyl glutamine amide (NAGGN), betaine, ectoine, and trehalose. Betaine and ectoine were produced by all pseudomonads, however, NAGGN and trehalose were observed by five and three strains, respectively. Four strains including P. chlororaphis (RP4), P. aeruginosa (At1RP4), P. fluorescens (RS1), and P. aurantiaca (PBSt2) were exposed to 1- 4% NaCl concentrations and evaluated for the changes in phenazine production profile which were negligible. AntiSMASH 5.0 platform showed 50 biosynthetic gene clusters in PB-St2, of which 23 (45%) were classified as putative gene clusters with ClusterFinder algorithm, five (10%) were classified as non-ribosomal peptides synthetases (NRPS), five (10%) as saccharides, and four (8%) were classified as putative fatty acids. The genomic attributes and comprehensive insights into the metabolomic profile of these Pseudomonas spp. strains showcase their phytostimulatory, phyto-protective, and osmoprotective effects of diverse crops grown in normal and saline soils. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-023-03607-x.
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Affiliation(s)
- Izzah Shahid
- Department of Biotechnology, Faculty of Science and Technology, University of Central Punjab, Lahore, Pakistan
| | - Jun Han
- University of Victoria-Genome BC Proteomics Center, University of Victoria, Victoria, BC V8Z 7X8 Canada
| | - Sharoon Hanook
- Department of Statistics, Forman Christian College (A Chartered University), Lahore, 54600 Pakistan
| | - Christoph H. Borchers
- University of Victoria-Genome BC Proteomics Center, University of Victoria, Victoria, BC V8Z 7X8 Canada
| | - Hesham Ali El Enshasy
- Institute of Bioproduct Development (IBD), Universiti Teknologi Malaysia (UTM), 81310 Skudai, Malaysia
- Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Malaysia
- City of Scientific Research and Technology Applications (SRTA), New Burg Al Arab, Alexandria, 21934 Egypt
| | - Samina Mehnaz
- School of Life Sciences, Forman Christian College (A Chartered University), Lahore, 54600 Pakistan
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Pan JY, Wang CB, Nong JL, Xie QL, Shen TM. Plant growth-promoting rhizobacteria are important contributors to rice yield in karst soils. 3 Biotech 2023; 13:158. [PMID: 37151997 PMCID: PMC10156889 DOI: 10.1007/s13205-023-03593-0] [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: 12/09/2022] [Accepted: 04/26/2023] [Indexed: 05/09/2023] Open
Abstract
The difficulty of releasing nutrients from soils in karst areas limits the yield of local crops and leads to poverty. In this study, two strains of plant growth-promoting rhizobacteria (PGPR) were isolated from the rhizosphere soil of typical plants in karst areas, which were both identified as Bacillus sp. and named GS1 and N1. And two isolates were used to construct a composite PGPR named MC1. These three strains of PGPR were used for soil inoculation in the pot experiment and field trial and their capacity to promote rice development was assessed. The results showed that MC1 inoculation exhibited notable rice growth-promoting ability in pot experiments, and, respectively, had an increment of 16.96, 18.74, and 11.50% in shoot biomass, total biomass, and rice height compared with control. This is largely attributed to PGPR's capacity to secrete phytohormones and soil enzymes, particularly urease (UE) in GS1, whose secreted UE content was significantly higher by 12.18% compared to the control. When applied to the field, MC1 inoculation not only increased rice yield by 8.52% and the available nutrient content in rice rhizosphere soil, such as available phosphorus (AP) and exchangeable magnesium (EMg); but also improved the abundance of beneficial rhizobacteria and the diversity of microbial communities in rice rhizosphere soil. Results in this study revealed that inoculated PGPR played a major role in promoting rice growth and development, and a new strategy for facilitating the growth of rice crops in agriculture was elucidated. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-023-03593-0.
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Affiliation(s)
- Jia-Yuan Pan
- School of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541004 People’s Republic of China
| | - Chao-Bei Wang
- School of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541004 People’s Republic of China
| | - Jie-Liang Nong
- School of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541004 People’s Republic of China
| | - Qing-Lin Xie
- School of Environmental Science and Engineering, Guilin University of Technology, Guilin, 541004 People’s Republic of China
| | - Tai-Ming Shen
- School of Energy and Building Environment, Guilin University of Aerospace Technology, Guilin, 541004 People’s Republic of China
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Anuar MSK, Hashim AM, Ho CL, Wong MY, Sundram S, Saidi NB, Yusof MT. Synergism: biocontrol agents and biostimulants in reducing abiotic and biotic stresses in crop. World J Microbiol Biotechnol 2023; 39:123. [PMID: 36934342 DOI: 10.1007/s11274-023-03579-3] [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: 02/02/2023] [Accepted: 03/12/2023] [Indexed: 03/20/2023]
Abstract
In today's fast-shifting climate change scenario, crops are exposed to environmental pressures, abiotic and biotic stress. Hence, these will affect the production of agricultural products and give rise to a worldwide economic crisis. The increase in world population has exacerbated the situation with increasing food demand. The use of chemical agents is no longer recommended due to adverse effects towards the environment and health. Biocontrol agents (BCAs) and biostimulants, are feasible options for dealing with yield losses induced by plant stresses, which are becoming more intense due to climate change. BCAs and biostimulants have been recommended due to their dual action in reducing both stresses simultaneously. Although protection against biotic stresses falls outside the generally accepted definition of biostimulant, some microbial and non-microbial biostimulants possess the biocontrol function, which helps reduce biotic pressure on crops. The application of synergisms using BCAs and biostimulants to control crop stresses is rarely explored. Currently, a combined application using both agents offer a great alternative to increase the yield and growth of crops while managing stresses. This article provides an overview of crop stresses and plant stress responses, a general knowledge on synergism, mathematical modelling used for synergy evaluation and type of in vitro and in vivo synergy testing, as well as the application of synergism using BCAs and biostimulants in reducing crop stresses. This review will facilitate an understanding of the combined effect of both agents on improving crop yield and growth and reducing stress while also providing an eco-friendly alternative to agroecosystems.
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Affiliation(s)
- Muhammad Salahudin Kheirel Anuar
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, UPM, Selangor, 43400, Malaysia
| | - Amalia Mohd Hashim
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, UPM, Selangor, 43400, Malaysia
| | - Chai Ling Ho
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, UPM, Selangor, 43400, Malaysia
| | - Mui-Yun Wong
- Department of Plant Protection, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, UPM, Selangor, 43400, Malaysia
| | - Shamala Sundram
- Biology Research Division, Malaysian Palm Oil Board, Kajang, Selangor, 43000, Malaysia
| | - Noor Baity Saidi
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, UPM, Selangor, 43400, Malaysia
| | - Mohd Termizi Yusof
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, UPM, Selangor, 43400, Malaysia.
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Henao Ramírez AM, Morales Muñoz JD, Vanegas Villa DM, Hernández Hernández RT, Urrea-Trujillo AI. Regeneration of cocoa (Theobroma cacao L.) via somatic embryogenesis: Key aspects in the in vitro conversion stage and in the ex vitro adaptation of plantlets. BIONATURA 2023. [DOI: 10.21931/rb/2023.08.01.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023] Open
Abstract
Adapting plantlets to ex vitro conditions is a decisive step in the micropropagation process via organogenesis or somatic embryogenesis (ES). The percentage of success in this stage determines the quality of the product, an example of which is found in cocoa plantlets regenerated by ES, which require specific conditions to overcome the stress of the new environment. Considering the quality of the in vitro plantlets largely determines the survival and growth in ex vitro conditions, the effect of two culture media between the embryo maturation stage and the initial stage of conversion to plantlet was evaluated (EM2 - MM6 and EM2 – MF medium), achieving with the latter greater stem height, root length and the number of true leaves. In the final stage of the conversion and growth of the plantlet, the effect of five culture media was evaluated (ENR6, MF, ENR8, EDL, PR), achieving better results in stem height, root length, and the number of true leaves on MF medium. In addition, it was found that the transition of the EM2-MF had a significant development in the presence of the desired pivoting root and fibrous roots. Under nursery conditions, the growth and development of the plantlets was tested through the inoculation of beneficial microorganisms to promote survival. The plantlets that met the minimum morphological parameters for acclimation were planted in a substrate of coconut palm and sand (3:1 v/v) previously selected in the laboratory (BS). The effect of Pseudomonas ACC deaminase (PAACd), Trichoderma asperellum (Ta) and arbuscular mycorrhiza forming fungus (AMF) and different concentrations of phosphorus (PC) (0%, 50% and 100%) in the Hoagland nutrient solution (1:10) was evaluated. First, for CCN5, 62.5% of survival was obtained with PAACd + AMF. Second, the largest leaf size and survival were obtained with PAACd + Ta for CNCh12 and CCN51; likewise, for CNCh13, the best result was obtained with PAACd.
Keywords: Cacao, Clonal propagation, Mycorrhiza, Pseudomonas, Trichoderma.
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Affiliation(s)
- Ana María Henao Ramírez
- Center of Agrobiotechnological Development and Innovation – CEDAIT, Universidad de Antioquia, Km. 1.7 vía San Antonio de Pereira - Carmen de Viboral, A.A 054048, Colombia
| | - Julián David Morales Muñoz
- Center of Agrobiotechnological Development and Innovation – CEDAIT, Universidad de Antioquia, Km. 1.7 vía San Antonio de Pereira - Carmen de Viboral, A.A 054048, Colombia
| | - Diana Marcela Vanegas Villa
- Center of Agrobiotechnological Development and Innovation – CEDAIT, Universidad de Antioquia, Km. 1.7 vía San Antonio de Pereira - Carmen de Viboral, A.A 054048, Colombia
| | | | - Aura Inés Urrea-Trujillo
- Biology Institute, Universidad de Antioquia, Calle 70 No. 52-21, Medellín, A. A 050010, Colombia
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Patel JS, Selvaraj V, More P, Bahmani R, Borza T, Prithiviraj B. A Plant Biostimulant from Ascophyllum nodosum Potentiates Plant Growth Promotion and Stress Protection Activity of Pseudomonas protegens CHA0. PLANTS (BASEL, SWITZERLAND) 2023; 12:1208. [PMID: 36986897 PMCID: PMC10053968 DOI: 10.3390/plants12061208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 02/28/2023] [Accepted: 03/06/2023] [Indexed: 06/18/2023]
Abstract
Abiotic stresses, including salinity stress, affect numerous crops, causing yield reduction, and, as a result, important economic losses. Extracts from the brown alga Ascophyllum nodosum (ANE), and compounds secreted by the Pseudomonas protegens strain, CHA0, can mitigate these effects by inducing tolerance against salt stress. However, the influence of ANE on P. protegens CHA0 secretion, and the combined effects of these two biostimulants on plant growth, are not known. Fucoidan, alginate, and mannitol are abundant components of brown algae and of ANE. Reported here are the effects of a commercial formulation of ANE, fucoidan, alginate, and mannitol, on pea (Pisum sativum), and on the plant growth-promoting activity of P. protegens CHA0. In most situations, ANE and fucoidan increased indole-3-acetic acid (IAA) and siderophore production, phosphate solubilization, and hydrogen cyanide (HCN) production by P. protegens CHA0. Colonization of pea roots by P. protegens CHA0 was found to be increased mostly by ANE and fucoidan in normal conditions and under salt stress. Applications of P. protegens CHA0 combined with ANE, or with fucoidan, alginate, and mannitol, generally augmented root and shoot growth in normal and salinity stress conditions. Real-time quantitative PCR analyses of P. protegens revealed that, in many instances, ANE and fucoidan enhanced the expression of several genes involved in chemotaxis (cheW and WspR), pyoverdine production (pvdS), and HCN production (hcnA), but gene expression patterns overlapped only occasionally those of growth-promoting parameters. Overall, the increased colonization and the enhanced activities of P. protegens CHA0 in the presence of ANE and its components mitigated salinity stress in pea. Among treatments, ANE and fucoidan were found responsible for most of the increased activities of P. protegens CHA0 and the improved plant growth.
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18
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Orozco-Mosqueda MDC, Santoyo G, Glick BR. Recent Advances in the Bacterial Phytohormone Modulation of Plant Growth. PLANTS (BASEL, SWITZERLAND) 2023; 12:606. [PMID: 36771689 PMCID: PMC9921776 DOI: 10.3390/plants12030606] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 01/26/2023] [Accepted: 01/27/2023] [Indexed: 06/18/2023]
Abstract
Phytohormones are regulators of plant growth and development, which under different types of stress can play a fundamental role in a plant's adaptation and survival. Some of these phytohormones such as cytokinin, gibberellin, salicylic acid, auxin, and ethylene are also produced by plant growth-promoting bacteria (PGPB). In addition, numerous volatile organic compounds are released by PGPB and, like bacterial phytohormones, modulate plant physiology and genetics. In the present work we review the basic functions of these bacterial phytohormones during their interaction with different plant species. Moreover, we discuss the most recent advances of the beneficial effects on plant growth of the phytohormones produced by PGPB. Finally, we review some aspects of the cross-link between phytohormone production and other plant growth promotion (PGP) mechanisms. This work highlights the most recent advances in the essential functions performed by bacterial phytohormones and their potential application in agricultural production.
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Affiliation(s)
- Ma. del Carmen Orozco-Mosqueda
- Departamento de Ingeniería Bioquímica y Ambiental, Tecnológico Nacional de México/I.T. Celaya, Celaya 38110, Guanajuato, Mexico
| | - Gustavo Santoyo
- Genomic Diversity Laboratory, Institute of Biological and Chemical Research, Universidad Michoacana de San Nicolás de Hidalgo, Morelia 58030, Michoacan, Mexico
| | - Bernard R. Glick
- Department of Biology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
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19
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Tian Z, Chen Y, Chen S, Yan D, Wang X, Guo Y. AcdS gene of Bacillus cereus enhances salt tolerance of seedlings in tobacco ( Nicotiana tabacum L.). BIOTECHNOL BIOTEC EQ 2022. [DOI: 10.1080/13102818.2022.2144450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Zengyuan Tian
- School of Agricultural Sciences, Zhengzhou University, Zhengzhou, Henan, PR China
| | - Yange Chen
- School of Agricultural Sciences, Zhengzhou University, Zhengzhou, Henan, PR China
| | - Shuai Chen
- School of Life Sciences, Zhengzhou University, Zhengzhou, Henan, PR China
| | - Daoliang Yan
- State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou, PR China
| | - Xiaoming Wang
- School of Life Sciences, Zhengzhou University, Zhengzhou, Henan, PR China
| | - Yuqi Guo
- School of Life Sciences, Zhengzhou University, Zhengzhou, Henan, PR China
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20
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Guerra M, Carrasco-Fernández J, Valdés JH, Panichini M, Franco Castro J. Draft genome of Pseudomonas sp. RGM 2987 isolated from Stevia philippiana roots reveals its potential as a plant biostimulant and potentially constitutes a novel species. ELECTRON J BIOTECHN 2022. [DOI: 10.1016/j.ejbt.2022.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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21
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Phour M, Sindhu SS. Mitigating abiotic stress: microbiome engineering for improving agricultural production and environmental sustainability. PLANTA 2022; 256:85. [PMID: 36125564 DOI: 10.1007/s00425-022-03997-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Accepted: 09/11/2022] [Indexed: 06/15/2023]
Abstract
The responses of plants to different abiotic stresses and mechanisms involved in their mitigation are discussed. Production of osmoprotectants, antioxidants, enzymes and other metabolites by beneficial microorganisms and their bioengineering ameliorates environmental stresses to improve food production. Progressive intensification of global agriculture, injudicious use of agrochemicals and change in climate conditions have deteriorated soil health, diminished the microbial biodiversity and resulted in environment pollution along with increase in biotic and abiotic stresses. Extreme weather conditions and erratic rains have further imposed additional stress for the growth and development of plants. Dominant abiotic stresses comprise drought, temperature, increased salinity, acidity, metal toxicity and nutrient starvation in soil, which severely limit crop production. For promoting sustainable crop production in environmentally challenging environments, use of beneficial microbes has emerged as a safer and sustainable means for mitigation of abiotic stresses resulting in improved crop productivity. These stress-tolerant microorganisms play an effective role against abiotic stresses by enhancing the antioxidant potential, improving nutrient acquisition, regulating the production of plant hormones, ACC deaminase, siderophore and exopolysaccharides and accumulating osmoprotectants and, thus, stimulating plant biomass and crop yield. In addition, bioengineering of beneficial microorganisms provides an innovative approach to enhance stress tolerance in plants. The use of genetically engineered stress-tolerant microbes as inoculants of crop plants may facilitate their use for enhanced nutrient cycling along with amelioration of abiotic stresses to improve food production for the ever-increasing population. In this chapter, an overview is provided about the current understanding of plant-bacterial interactions that help in alleviating abiotic stress in different crop systems in the face of climate change. This review largely focuses on the importance and need of sustainable and environmentally friendly approaches using beneficial microbes for ameliorating the environmental stresses in our agricultural systems.
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Affiliation(s)
- Manisha Phour
- Department of Microbiology, CCS Haryana Agricultural University, Hisar, 125004, India
- University Institute of Biotechnology, Chandigarh University, Mohali, India
| | - Satyavir S Sindhu
- Department of Microbiology, CCS Haryana Agricultural University, Hisar, 125004, India.
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Jin T, Ren J, Li Y, Bai B, Liu R, Wang Y. Plant growth-promoting effect and genomic analysis of the P. putida LWPZF isolated from C. japonicum rhizosphere. AMB Express 2022; 12:101. [PMID: 35917000 PMCID: PMC9346032 DOI: 10.1186/s13568-022-01445-3] [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: 01/28/2022] [Accepted: 07/28/2022] [Indexed: 11/22/2022] Open
Abstract
Plant growth-promoting rhizobacteria are a type of beneficial bacteria which inhabit in the rhizosphere and possess the abilities to promote plant growth. Pseudomonas putida LWPZF is a plant growth-promoting bacterium isolated from the rhizosphere soil of Cercidiphyllum japonicum. Inoculation treatment with LWPZF could significantly promote the growth of C. japonicum seedlings. P. putida LWPZF has a variety of plant growth-promoting properties, including the ability to solubilize phosphate, synthesize ACC deaminase and IAA. The P. putida LWPZF genome contained a circular chromosome (6,259,530 bp) and a circular plasmid (160,969 bp) with G+C contents of 61.75% and 58.25%, respectively. There were 5632 and 169 predicted protein-coding sequences (CDSs) on the chromosome and the plasmid respectively. Genome sequence analysis revealed lots of genes associated with biosynthesis of IAA, pyoverdine, ACC deaminase, trehalose, volatiles acetoin and 2,3-butanediol, 4-hydroxybenzoate, as well as gluconic acid contributing phosphate solubilization. Additionally, we identified many heavy metal resistance genes, including arsenate, copper, chromate, cobalt-zinc-cadmium, and mercury. These results suggest that P. putida LWPZF shows strong potential in the fields of biofertilizer, biocontrol and heavy metal contamination soil remediation. The data presented in this study will allow us to better understand the mechanisms of plant growth promotion, biocontrol, and anti-heavy metal of P. putida LWPZF.
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Affiliation(s)
- Tingting Jin
- Department of Life Sciences, Changzhi University, Changzhi, 046011, People's Republic of China
| | - Jiahong Ren
- Department of Life Sciences, Changzhi University, Changzhi, 046011, People's Republic of China.
| | - Yunling Li
- Department of Life Sciences, Changzhi University, Changzhi, 046011, People's Republic of China
| | - Bianxia Bai
- Department of Life Sciences, Changzhi University, Changzhi, 046011, People's Republic of China
| | - Ruixiang Liu
- Department of Life Sciences, Changzhi University, Changzhi, 046011, People's Republic of China
| | - Ying Wang
- Department of Life Sciences, Changzhi University, Changzhi, 046011, People's Republic of China
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23
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Kherfi-Nacer A, Yan Z, Bouherama A, Schmitz L, Amrane SO, Franken C, Schneijderberg M, Cheng X, Amrani S, Geurts R, Bisseling T. High Salt Levels Reduced Dissimilarities in Root-Associated Microbiomes of Two Barley Genotypes. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2022; 35:592-603. [PMID: 35316093 DOI: 10.1094/mpmi-12-21-0294-fi] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Plants harbor in and at their roots bacterial microbiomes that contribute to their health and fitness. The microbiome composition is controlled by the environment and plant genotype. Previously, it was shown that the plant genotype-dependent dissimilarity of root microbiome composition of different species becomes smaller under drought stress. However, it remains unknown whether this reduced plant genotype-dependent effect is a specific response to drought stress or a more generic response to abiotic stress. To test this, we studied the effect of salt stress on two distinct barley (Hordeum vulgare L.) genotypes: the reference cultivar Golden Promise and the Algerian landrace AB. As inoculum, we used soil from salinized and degraded farmland on which barley was cultivated. Controlled laboratory experiments showed that plants inoculated with this soil displayed growth stimulation under high salt stress (200 mM) in a plant genotype-independent manner, whereas the landrace AB also showed significant growth stimulation at low salt concentrations. Subsequent analysis of the root microbiomes revealed a reduced dissimilarity of the bacterial communities of the two barley genotypes in response to high salt, especially in the endophytic compartment. High salt level did not reduce α-diversity (richness) in the endophytic compartment of both plant genotypes but was associated with an increased number of shared strains that respond positively to high salt. Among these, Pseudomonas spp. were most abundant. These findings suggest that the plant genotype-dependent microbiome composition is altered generically by abiotic stress.[Formula: see text] Copyright © 2022 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
- Asma Kherfi-Nacer
- Laboratory of Biology and Physiology of Organisms (LBPO), Biological Sciences Faculty, Houari Boumediène Sciences and Technology University (USTHB), BP 32, El-Alia, Bab Ezzouar, Algiers 16111, Algeria
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Science Group, Wageningen University and Research (WUR), Droevendaalsesteeg 1, Wageningen 6708PB, The Netherlands
| | - Zhichun Yan
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Science Group, Wageningen University and Research (WUR), Droevendaalsesteeg 1, Wageningen 6708PB, The Netherlands
| | - Amina Bouherama
- Laboratory of Biology and Physiology of Organisms (LBPO), Biological Sciences Faculty, Houari Boumediène Sciences and Technology University (USTHB), BP 32, El-Alia, Bab Ezzouar, Algiers 16111, Algeria
- Sciences Faculty, Yahia Farès University, Médéa 26000, Algeria
| | - Lucas Schmitz
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Science Group, Wageningen University and Research (WUR), Droevendaalsesteeg 1, Wageningen 6708PB, The Netherlands
| | - Saadia Ouled Amrane
- Laboratory of Biology and Physiology of Organisms (LBPO), Biological Sciences Faculty, Houari Boumediène Sciences and Technology University (USTHB), BP 32, El-Alia, Bab Ezzouar, Algiers 16111, Algeria
- Research Experimental Field Station, Belbachir, El-Meniaa, Ghardaïa 47001, Algeria
| | - Carolien Franken
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Science Group, Wageningen University and Research (WUR), Droevendaalsesteeg 1, Wageningen 6708PB, The Netherlands
| | - Martinus Schneijderberg
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Science Group, Wageningen University and Research (WUR), Droevendaalsesteeg 1, Wageningen 6708PB, The Netherlands
| | - Xu Cheng
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Science Group, Wageningen University and Research (WUR), Droevendaalsesteeg 1, Wageningen 6708PB, The Netherlands
- Agricultural Genome Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518124, China
| | - Said Amrani
- Laboratory of Biology and Physiology of Organisms (LBPO), Biological Sciences Faculty, Houari Boumediène Sciences and Technology University (USTHB), BP 32, El-Alia, Bab Ezzouar, Algiers 16111, Algeria
| | - Rene Geurts
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Science Group, Wageningen University and Research (WUR), Droevendaalsesteeg 1, Wageningen 6708PB, The Netherlands
| | - Ton Bisseling
- Laboratory of Molecular Biology, Cluster of Plant Developmental Biology, Plant Science Group, Wageningen University and Research (WUR), Droevendaalsesteeg 1, Wageningen 6708PB, The Netherlands
- Beijing Advanced Innovation Centre for Tree Breeding by Molecular Design, Beijing University of Agriculture, Beijing 102206, China
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Muthuraja R, Muthukumar T. Co-inoculation of halotolerant potassium solubilizing Bacillus licheniformis and Aspergillus violaceofuscus improves tomato growth and potassium uptake in different soil types under salinity. CHEMOSPHERE 2022; 294:133718. [PMID: 35077735 DOI: 10.1016/j.chemosphere.2022.133718] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 01/10/2022] [Accepted: 01/20/2022] [Indexed: 06/14/2023]
Abstract
Soil salinity is an important stress that negatively affects crop growth and productivity, causing extensive agricultural losses, worldwide. Potassium (K) solubilizing microorganisms (KSMs) can impart abiotic stress tolerance in plants in addition to nutrient solubilization. In this study, the salinity tolerance of KSMs Bacillus licheniformis and Aspergillus violaceofuscus originating from saxicolous habitats was examined using different concentrations of NaCl (0, 25, 50, 75, 100, and 125 mM) under in vitro conditions. The results indicated that both KSMs were capable of tolerating salinity. As B. licheniformis had a maximum growth in 100 mM NaCl at 37 °C, A. violaceofuscus had the maximum biomass and catalase (CAT) activity at 75 mM NaCl. However, maximum proline content was detected at 100 mM NaCl in both KSMs. Further, the ability of these KSMs to promote tomato growth individually and in combination with the presence or absence of mica was also examined in unsterilized or sterilized Alfisol and Vertisol soils under induced salinity in greenhouse conditions. The results of the greenhouse study revealed that inoculation of KSMs along with/without mica amendment significantly improved the morphological and physiological characteristics of tomato plants under salinity. Plant height, leaf area, biomass, relative water content, proline content, and CAT activity of dual inoculated plants were significantly higher than non-inoculated plants. Significant correlations existed between various soil, plant growth, soil pH and available K. From the results, it could be concluded that B. licheniformis and A. violaceofuscus are potential candidates for improving crop production in saline-stressed soils.
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Affiliation(s)
- Raji Muthuraja
- Root and Soil Biology Laboratory, Department of Botany, Bharathiar University, Coimbatore, 641046, Tamil Nadu, India.
| | - Thangavelu Muthukumar
- Root and Soil Biology Laboratory, Department of Botany, Bharathiar University, Coimbatore, 641046, Tamil Nadu, India.
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25
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Costa-Gutierrez SB, Adler C, Espinosa-Urgel M, de Cristóbal RE. Pseudomonas putida and its close relatives: mixing and mastering the perfect tune for plants. Appl Microbiol Biotechnol 2022; 106:3351-3367. [PMID: 35488932 PMCID: PMC9151500 DOI: 10.1007/s00253-022-11881-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 03/09/2022] [Accepted: 03/10/2022] [Indexed: 11/16/2022]
Abstract
Abstract Plant growth–promoting rhizobacteria (PGPR) are a group of microorganisms of utmost interest in agricultural biotechnology for their stimulatory and protective effects on plants. Among the various PGPR species, some Pseudomonas putida strains combine outstanding traits such as phytohormone synthesis, nutrient solubilization, adaptation to different stress conditions, and excellent root colonization ability. In this review, we summarize the state of the art and the most relevant findings related to P. putida and its close relatives as PGPR, and we have compiled a detailed list of P. putida sensu stricto, sensu lato, and close relative strains that have been studied for their plant growth–promoting characteristics. However, the mere in vitro analysis of these characteristics does not guarantee correct plant performance under in vivo or field conditions. Therefore, the importance of studying adhesion and survival in the rhizosphere, as well as responses to environmental factors, is emphasized. Although numerous strains of this species have shown good performance in field trials, their use in commercial products is still very limited. Thus, we also analyze the opportunities and challenges related to the formulation and application of bioproducts based on these bacteria. Key points •The mini-review updates the knowledge on Pseudomonas putida as a PGPR. • Some rhizosphere strains are able to improve plant growth under stress conditions. • The metabolic versatility of this species encourages the development of a bioproduct.
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Affiliation(s)
- Stefanie Bernardette Costa-Gutierrez
- Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano Y Pasaje Caseros, 4000, San Miguel de Tucumán, Tucumán, Argentina
| | - Conrado Adler
- Instituto Superior de Investigaciones Biológicas (INSIBIO, CONICET-UNT) E Instituto de Química Biológica "Dr. Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, 461, 4000 San Miguel de Tucumán, Chacabuco, Tucumán, Argentina
| | - Manuel Espinosa-Urgel
- Department of Environmental Protection, Estación Experimental del Zaidín, CSIC, Profesor Albareda 1, 18008, Granada, Spain
| | - Ricardo Ezequiel de Cristóbal
- Instituto Superior de Investigaciones Biológicas (INSIBIO, CONICET-UNT) E Instituto de Química Biológica "Dr. Bernabé Bloj", Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, 461, 4000 San Miguel de Tucumán, Chacabuco, Tucumán, Argentina.
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26
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Qian L, Song F, Xia J, Wang R. A Glucuronic Acid-Producing Endophyte Pseudomonas sp. MCS15 Reduces Cadmium Uptake in Rice by Inhibition of Ethylene Biosynthesis. FRONTIERS IN PLANT SCIENCE 2022; 13:876545. [PMID: 35498658 PMCID: PMC9047996 DOI: 10.3389/fpls.2022.876545] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 03/30/2022] [Indexed: 06/14/2023]
Abstract
Dynamic regulation of phytohormone levels is pivotal for plant adaptation to harmful conditions. It is increasingly evidenced that endophytic bacteria can regulate plant hormone levels to help their hosts counteract adverse effects imposed by abiotic and biotic stresses, but the mechanisms underlying the endophyte-induced stress resistance of plants remain largely elusive. In this study, a glucuronic acid-producing endophyte Pseudomonas sp. MCS15 alleviated cadmium (Cd) toxicity in rice plants. Inoculation with MCS15 significantly inhibited the expression of ethylene biosynthetic genes including OsACO3, OsACO4, OsACO5, OsACS2, and OsACS5 and thus reduced the content of ethylene in rice roots. In addition, the expression of iron uptake-related genes including OsIRT1, OsIRT2, OsNAS1, OsNAS2 and OsYSL15 was significantly downregulated in the MCS15-inoculated roots under Cd stress. Similarly, glucuronic acid treatment also remarkably inhibited root uptake of Cd and reduced the production of ethylene. However, treatment with 1-aminocyclopropyl carboxylic acid (ACC), a precursor of ethylene, almost abolished the MCS15 or glucuronic acid-induced inhibition of Cd accumulation in rice plants. Conversely, treatment with aminoethoxyvinyl glycine (AVG), an inhibitor of ethylene biosynthesis, markedly reduced the Cd accumulation in plants. Taken together, our results revealed that the endophytic bacteria MCS15-secreted glucuronic acid inhibited the biosynthesis of ethylene and thus weakened iron uptake-related systems in rice roots, which contributed to preventing the Cd accumulation.
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Affiliation(s)
- Lisheng Qian
- College of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Fei Song
- College of Life Sciences, Anhui Agricultural University, Hefei, China
| | - Jinlin Xia
- College of Life Sciences, Anhui Agricultural University, Hefei, China
- Anhui Shengnong Agricultural Group Co., Ltd., Maanshan, China
| | - Rongfu Wang
- College of Life Sciences, Anhui Agricultural University, Hefei, China
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Chandwani S, Amaresan N. Role of ACC deaminase producing bacteria for abiotic stress management and sustainable agriculture production. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:22843-22859. [PMID: 35050477 DOI: 10.1007/s11356-022-18745-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 01/14/2022] [Indexed: 06/14/2023]
Abstract
Plants are immobile and are exposed to various biotic and abiotic stresses, including heat, cold, drought, flooding, nutrient deficiency, heavy metal exposure, phytopathogens, and pest attacks. The stressors significantly affect agricultural productivity when exceed a certain threshold. It has been reported that most of the stressed plants are reported to have increased ethylene synthesis from its precursor 1-aminocyclopropane-1-carboxylic acid (ACC). Ethylene is a plant hormone that plays a vital role in the regulation of various physiological processes, such as respiration, nitrogen fixation, and photosynthesis. The increment in the plant hormone ethylene would reduce plant growth and development, and if the ethylene level increased beyond the limit, it could also result in plant death. Therefore, plant growth-promoting bacteria (PGPB) possessing ACC deaminase activity play an essential role in the management of biotic and abiotic stresses by hydrolysing 1-aminocyclopropane-1-carboxylic acid using ACC deaminase. In this review, the importance of ACC deaminase-producing bacteria in promoting plant growth under various abiotic stressors is discussed.
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Affiliation(s)
- Sapna Chandwani
- C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Maliba Campus, Bardoli- 394 350, Surat, Gujarat, India
| | - Natarajan Amaresan
- C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Maliba Campus, Bardoli- 394 350, Surat, Gujarat, India.
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Gupta A, Mishra R, Rai S, Bano A, Pathak N, Fujita M, Kumar M, Hasanuzzaman M. Mechanistic Insights of Plant Growth Promoting Bacteria Mediated Drought and Salt Stress Tolerance in Plants for Sustainable Agriculture. Int J Mol Sci 2022; 23:3741. [PMID: 35409104 PMCID: PMC8998651 DOI: 10.3390/ijms23073741] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 03/25/2022] [Accepted: 03/26/2022] [Indexed: 12/17/2022] Open
Abstract
Climate change has devastating effects on plant growth and yield. During ontogenesis, plants are subjected to a variety of abiotic stresses, including drought and salinity, affecting the crop loss (20-50%) and making them vulnerable in terms of survival. These stresses lead to the excessive production of reactive oxygen species (ROS) that damage nucleic acid, proteins, and lipids. Plant growth-promoting bacteria (PGPB) have remarkable capabilities in combating drought and salinity stress and improving plant growth, which enhances the crop productivity and contributes to food security. PGPB inoculation under abiotic stresses promotes plant growth through several modes of actions, such as the production of phytohormones, 1-aminocyclopropane-1-carboxylic acid deaminase, exopolysaccharide, siderophore, hydrogen cyanide, extracellular polymeric substances, volatile organic compounds, modulate antioxidants defense machinery, and abscisic acid, thereby preventing oxidative stress. These bacteria also provide osmotic balance; maintain ion homeostasis; and induce drought and salt-responsive genes, metabolic reprogramming, provide transcriptional changes in ion transporter genes, etc. Therefore, in this review, we summarize the effects of PGPB on drought and salinity stress to mitigate its detrimental effects. Furthermore, we also discuss the mechanistic insights of PGPB towards drought and salinity stress tolerance for sustainable agriculture.
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Affiliation(s)
- Anmol Gupta
- IIRC-3, Plant–Microbe Interaction and Molecular Immunology Laboratory, Department of Biosciences, Faculty of Science, Integral University, Lucknow 226026, Uttar Pradesh, India; (A.G.); (S.R.); (A.B.)
| | - Richa Mishra
- Department of Biochemistry, Dr. Rammanohar Lohia Avadh University, Ayodhya 224123, Uttar Pradesh, India; (R.M.); (N.P.)
| | - Smita Rai
- IIRC-3, Plant–Microbe Interaction and Molecular Immunology Laboratory, Department of Biosciences, Faculty of Science, Integral University, Lucknow 226026, Uttar Pradesh, India; (A.G.); (S.R.); (A.B.)
| | - Ambreen Bano
- IIRC-3, Plant–Microbe Interaction and Molecular Immunology Laboratory, Department of Biosciences, Faculty of Science, Integral University, Lucknow 226026, Uttar Pradesh, India; (A.G.); (S.R.); (A.B.)
| | - Neelam Pathak
- Department of Biochemistry, Dr. Rammanohar Lohia Avadh University, Ayodhya 224123, Uttar Pradesh, India; (R.M.); (N.P.)
| | - Masayuki Fujita
- Laboratory of Plant Stress Responses, Faculty of Agriculture, Kagawa University, Kagawa 761-0795, Japan
| | - Manoj Kumar
- Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, Rishon LeZion 7505101, Israel
| | - Mirza Hasanuzzaman
- Department of Agronomy, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh
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Salt Stress Tolerance-Promoting Proteins and Metabolites under Plant-Bacteria-Salt Stress Tripartite Interactions. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12063126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The rapid increase in soil salinization has impacted agricultural output and poses a threat to food security. There is an urgent need to focus on improving soil fertility and agricultural yield, both of which are severely influenced by abiotic variables such as soil salinity and sodicity. Abiotic forces have rendered one-third of the overall land unproductive. Microbes are the primary answer to the majority of agricultural production’s above- and below-ground problems. In stressful conditions, proper communication between plants and beneficial microbes is critical for avoiding plant cell damage. Many chemical substances such as proteins and metabolites synthesized by bacteria and plants mediate communication and stress reduction. Metabolites such as amino acids, fatty acids, carbohydrates, vitamins, and lipids as well as proteins such as aquaporins and antioxidant enzymes play important roles in plant stress tolerance. Plant beneficial bacteria have an important role in stress reduction through protein and metabolite synthesis under salt stress. Proper genomic, proteomic and metabolomics characterization of proteins and metabolites’ roles in salt stress mitigation aids scientists in discovering a profitable avenue for increasing crop output. This review critically examines recent findings on proteins and metabolites produced during plant-bacteria interaction essential for the development of plant salt stress tolerance.
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Gamalero E, Glick BR. Recent Advances in Bacterial Amelioration of Plant Drought and Salt Stress. BIOLOGY 2022; 11:biology11030437. [PMID: 35336811 PMCID: PMC8945159 DOI: 10.3390/biology11030437] [Citation(s) in RCA: 39] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Revised: 03/10/2022] [Accepted: 03/10/2022] [Indexed: 12/16/2022]
Abstract
Simple Summary Salt and drought stress cause enormous crop losses worldwide. Several different approaches may be taken to address this problem, including increased use of irrigation, use of both traditional breeding and genetic engineering to develop salt-tolerant and drought-resistant crop plants, and the directed use of naturally occurring plant growth-promoting bacteria. Here, the mechanisms used by these plant growth-promoting bacteria are summarized and discussed. Moreover, recently reported studies of the effects that these organisms have on the growth of plants in the laboratory, the greenhouse, and the field under high salt and/or drought conditions is discussed in some detail. It is hoped that by understanding the mechanisms that these naturally occurring plant growth-promoting bacteria utilize to overcome damaging environmental stresses, it may be possible to employ these organisms to increase future agricultural productivity. Abstract The recent literature indicates that plant growth-promoting bacteria (PGPB) employ a range of mechanisms to augment a plant’s ability to ameliorate salt and drought stress. These mechanisms include synthesis of auxins, especially indoleacetic acid, which directly promotes plant growth; synthesis of antioxidant enzymes such as catalase, superoxide dismutase and peroxidase, which prevents the deleterious effects of reactive oxygen species; synthesis of small molecule osmolytes, e.g., trehalose and proline, which structures the water content within plant and bacterial cells and reduces plant turgor pressure; nitrogen fixation, which directly improves plant growth; synthesis of exopolysaccharides, which protects plant cells from water loss and stabilizes soil aggregates; synthesis of antibiotics, which protects stress-debilitated plants from soil pathogens; and synthesis of the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase, which lowers the level of ACC and ethylene in plants, thereby decreasing stress-induced plant senescence. Many of the reports of overcoming these plant stresses indicate that the most successful PGPB possess several of these mechanisms; however, the involvement of any particular mechanism in plant protection is nearly always inferred and not proven.
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Affiliation(s)
- Elisa Gamalero
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale T. Michel 11, 15121 Alessandria, Italy
- Correspondence:
| | - Bernard R. Glick
- Department of Biology, University of Waterloo, Waterloo, ON N2L 3G1, Canada;
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Segura A, Molina L. Plant salt tolerance: ACC deaminase-producing endophytes change plant proteomic profiles. Environ Microbiol 2022; 24:3310-3312. [PMID: 35254736 DOI: 10.1111/1462-2920.15967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 03/04/2022] [Indexed: 11/29/2022]
Affiliation(s)
- Ana Segura
- Estación Experimental del Zaidín, CSIC, Profesor Albareda 1, Granada, 18008, Spain
| | - Lázaro Molina
- Estación Experimental del Zaidín, CSIC, Profesor Albareda 1, Granada, 18008, Spain
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Dukare A, Mhatre P, Maheshwari HS, Bagul S, Manjunatha BS, Khade Y, Kamble U. Delineation of mechanistic approaches of rhizosphere microorganisms facilitated plant health and resilience under challenging conditions. 3 Biotech 2022; 12:57. [PMID: 35186654 PMCID: PMC8817020 DOI: 10.1007/s13205-022-03115-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 01/12/2022] [Indexed: 12/27/2022] Open
Abstract
Sustainable agriculture demands the balanced use of inorganic, organic, and microbial biofertilizers for enhanced plant productivity and soil fertility. Plant growth-enhancing rhizospheric bacteria can be an excellent biotechnological tool to augment plant productivity in different agricultural setups. We present an overview of microbial mechanisms which directly or indirectly contribute to plant growth, health, and development under highly variable environmental conditions. The rhizosphere microbiomes promote plant growth, suppress pathogens and nematodes, prime plants immunity, and alleviate abiotic stress. The prospective of beneficial rhizobacteria to facilitate plant growth is of primary importance, particularly under abiotic and biotic stresses. Such microbe can promote plant health, tolerate stress, even remediate soil pollutants, and suppress phytopathogens. Providing extra facts and a superior understanding of microbial traits underlying plant growth promotion can stir the development of microbial-based innovative solutions for the betterment of agriculture. Furthermore, the application of novel scientific approaches for facilitating the design of crop-specific microbial biofertilizers is discussed. In this context, we have highlighted the exercise of "multi-omics" methods for assessing the microbiome's impact on plant growth, health, and overall fitness via analyzing biochemical, physiological, and molecular facets. Furthermore, the role of clustered regularly interspaced short palindromic repeats (CRISPR) based genome alteration and nanotechnology for improving the agronomic performance and rhizosphere microbiome is also briefed. In a nutshell, the paper summarizes the recent vital molecular processes that underlie the different beneficial plant-microbe interactions imperative for enhancing plant fitness and resilience under-challenged agriculture.
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Affiliation(s)
- Ajinath Dukare
- ICAR-Central Institute for Research on Cotton Technology (CIRCOT), Mumbai, Maharashtra India
| | - Priyank Mhatre
- ICAR-Central Potato Research Institute (Regional Station), Udhagamandalam, Tamil Nadu India
| | - Hemant S. Maheshwari
- ICAR-Indian Institute of Soybean Research (IISR), Indore, Madhya Pradesh India
- Present Address: Ecophysiology of Plants, Faculty of Science and Engineering, GELIFES-Groningen Institute for Evolutionary Life Sciences, The University of Groningen, Nijenborgh 7, 9747 AG Groningen, The Netherlands
| | - Samadhan Bagul
- ICAR-Directorate of Medicinal and Aromatic Plant Research, Anand, Gujarat India
| | - B. S. Manjunatha
- ICAR-National Institute of Natural Fibre Engineering and Technology, Kolkata, West Bengal India
| | - Yogesh Khade
- ICAR- Directorate of Onion and Garlic Research, Pune, Maharashtra India
| | - Umesh Kamble
- ICAR-Indian Institute of Wheat and Barley Research, Karnal, Haryana India
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33
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Choudhury AR, Roy SK, Trivedi P, Choi J, Cho K, Yun SH, Walitang DI, Park JH, Kim K, Sa T. Label-free proteomics approach reveals candidate proteins in rice (Oryza sativa L.) important for ACC deaminase producing bacteria-mediated tolerance against salt stress. Environ Microbiol 2022; 24:3612-3624. [PMID: 35191581 DOI: 10.1111/1462-2920.15937] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 02/10/2022] [Accepted: 02/11/2022] [Indexed: 11/30/2022]
Abstract
The omics-based studies are important for identifying characteristic proteins in plants to elucidate the mechanism of ACC deaminase producing bacteria-mediated salt tolerance. This study evaluates the changes in the proteome of rice inoculated with ACC deaminase producing bacteria under salt stress conditions. Salt stress resulted in a significant decrease in photosynthetic pigments, whereas inoculation of Methylobacterium oryzae CBMB20 had significantly increased pigment contents under normal and salt stress conditions. A total of 76, 51 and 33 differentially abundant proteins (DAPs) were identified in non-inoculated salt stressed plants, bacteria inoculated plants under normal and salt stress conditions, respectively. The abundances of proteins responsible for ethylene emission and programmed cell death were increased, and that of photosynthesis-related proteins were decreased in non-inoculated plants under salt stress. Whereas, bacteria-inoculated plants had shown higher abundance of antioxidant proteins, RuBisCo and ribosomal proteins that are important for enhancing stress tolerance and improving plant physiological traits. Collectively, salt stress might affect plant physiological traits by impairing photosynthetic machinery and accelerating apoptosis leading to a decline in biomass. However, inoculation of plants with bacteria can assist in enhancing photosynthetic activity, antioxidant activities and ethylene regulation related proteins for attenuating salt induced apoptosis and sustaining growth and development. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Aritra Roy Choudhury
- Department of Environmental and Biological Chemistry, Chungbuk National University, Cheongju, Republic of Korea.,Bio-Evaluation Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju, Republic of Korea
| | - Swapan Kumar Roy
- College of Agricultural Sciences, IUBAT-International University of Business Agriculture and Technology, Dhaka, Bangladesh
| | - Pankaj Trivedi
- Microbiome Network and Department of Agricultural Biology, Colorado State University, Fort Collins, CO, USA
| | - Jeongyun Choi
- Department of Environmental and Biological Chemistry, Chungbuk National University, Cheongju, Republic of Korea.,Department of Agricultural Biology, Colorado State University, Fort Collins, CO, USA
| | - Kun Cho
- Bio-chemical Analysis Team, Center for Research Equipment, Korea Basic Science Institute, Cheongju, Republic of Korea
| | - Sung Ho Yun
- Bio-chemical Analysis Team, Center for Research Equipment, Korea Basic Science Institute, Cheongju, Republic of Korea
| | - Denver I Walitang
- Department of Environmental and Biological Chemistry, Chungbuk National University, Cheongju, Republic of Korea.,College of Agriculture, Fisheries and Forestry, Romblon State University, Philippines
| | - Jung-Ho Park
- Bio-Evaluation Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju, Republic of Korea.,Department of Bioprocess Engineering, University of Science and Technology (UST) of Korea, Daejeon, Republic of Korea
| | - Kiyoon Kim
- National Forest Seed Variety Center, Chungju, Republic of Korea
| | - Tongmin Sa
- Department of Environmental and Biological Chemistry, Chungbuk National University, Cheongju, Republic of Korea.,The Korean Academy of Science and Technology, Seongnam, Republic of Korea
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Rizvi A, Ahmed B, Khan MS, El-Beltagi HS, Umar S, Lee J. Bioprospecting Plant Growth Promoting Rhizobacteria for Enhancing the Biological Properties and Phytochemical Composition of Medicinally Important Crops. Molecules 2022; 27:molecules27041407. [PMID: 35209196 PMCID: PMC8880754 DOI: 10.3390/molecules27041407] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 02/03/2022] [Accepted: 02/15/2022] [Indexed: 12/04/2022] Open
Abstract
Traditionally, medicinal plants have long been used as a natural therapy. Plant-derived extracts or phytochemicals have been exploited as food additives and for curing many health-related ailments. The secondary metabolites produced by many plants have become an integral part of human health and have strengthened the value of plant extracts as herbal medicines. To fulfil the demand of health care systems, food and pharmaceutical industries, interest in the cultivation of precious medicinal plants to harvest bio-active compounds has increased considerably worldwide. To achieve maximum biomass and yield, growers generally apply chemical fertilizers which have detrimental impacts on the growth, development and phytoconstituents of such therapeutically important plants. Application of beneficial rhizosphere microbiota is an alternative strategy to enhance the production of valuable medicinal plants under both conventional and stressed conditions due to its low cost, environmentally friendly behaviour and non-destructive impact on fertility of soil, plants and human health. The microbiological approach improves plant growth by various direct and indirect mechanisms involving the abatement of various abiotic stresses. Given the negative impacts of fertilizers and multiple benefits of microbiological resources, the role of plant growth promoting rhizobacteria (PGPR) in the production of biomass and their impact on the quality of bio-active compounds (phytochemicals) and mitigation of abiotic stress to herbal plants have been described in this review. The PGPR based enhancement in the herbal products has potential for use as a low cost phytomedicine which can be used to improve health care systems.
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Affiliation(s)
- Asfa Rizvi
- Department of Botany, School of Chemical and Life Sciences, Jamia Hamdard, Hamdard Nagar, New Delhi 110062, India; (A.R.); (S.U.)
| | - Bilal Ahmed
- School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Korea;
- Correspondence: (B.A.); (H.S.E.-B.)
| | - Mohammad Saghir Khan
- Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202002, India;
| | - Hossam S. El-Beltagi
- Agricultural Biotechnology Department, College of Agriculture and Food Sciences, King Faisal University, P.O. Box 420, Al-Ahsa 31982, Saudi Arabia
- Biochemistry Department, Faculty of Agriculture, Cairo University, Gamma St., Cairo 12613, Egypt
- Correspondence: (B.A.); (H.S.E.-B.)
| | - Shahid Umar
- Department of Botany, School of Chemical and Life Sciences, Jamia Hamdard, Hamdard Nagar, New Delhi 110062, India; (A.R.); (S.U.)
| | - Jintae Lee
- School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Korea;
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Onwe RO, Onwosi CO, Ezugworie FN, Ekwealor CC, Okonkwo CC. Microbial trehalose boosts the ecological fitness of biocontrol agents, the viability of probiotics during long-term storage and plants tolerance to environmental-driven abiotic stress. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150432. [PMID: 34560451 DOI: 10.1016/j.scitotenv.2021.150432] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 08/10/2021] [Accepted: 09/14/2021] [Indexed: 06/13/2023]
Abstract
Despite the impressive gain in agricultural production and greater availability of food, a large portion of the world population is affected by food shortages and nutritional imbalance. This is due to abiotic stresses encountered by plants as a result of environmental-driven perturbations, loss of viability of starter cultures (probiotics) for functional foods during storage as well as the vulnerability of farm produce to postharvest pathogens. The use of compatible solutes (e.g., trehalose, proline, etc.) has been widely supported as a solution to these concerns. Trehalose is one of the widely reported microbial- or plant-derived metabolites that help microorganisms (e.g., biocontrol agents, probiotics and plant growth-promoting bacteria) and plants to tolerate harsh environmental conditions. Due to its recent categorization as generally regarded as safe (GRAS), trehalose is an essential tool for promoting nutrition-sensitive agriculture by replacing the overuse of chemical agents (e.g., pesticides, herbicides). Therefore, the current review evaluated the progress currently made in the application of trehalose in sustainable agriculture. The challenges, opportunities, and future of this biometabolite in food security were highlighted.
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Affiliation(s)
- Reuben O Onwe
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria
| | - Chukwudi O Onwosi
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria; Bioconversion and Renewable Energy Research Unit, University of Nigeria, Nsukka, Enugu State, Nigeria.
| | - Flora N Ezugworie
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria; Bioconversion and Renewable Energy Research Unit, University of Nigeria, Nsukka, Enugu State, Nigeria
| | - Chito C Ekwealor
- Department of Applied Microbiology and Brewing, Faculty of Biosciences, Nnamdi Azikiwe University, P.M.B. 5025, Awka, Anambra State, Nigeria
| | - Chigozie C Okonkwo
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria
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Rangseekaew P, Barros-Rodríguez A, Pathom-aree W, Manzanera M. Plant Beneficial Deep-Sea Actinobacterium, Dermacoccus abyssi MT1.1T Promote Growth of Tomato (Solanum lycopersicum) under Salinity Stress. BIOLOGY 2022; 11:biology11020191. [PMID: 35205058 PMCID: PMC8869415 DOI: 10.3390/biology11020191] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/01/2022] [Revised: 01/24/2022] [Accepted: 01/24/2022] [Indexed: 12/23/2022]
Abstract
Simple Summary Salt stress is an important environmental problem that negatively affects agricultural and food production in the world. Currently, the use of plant beneficial bacteria for plant growth promotion is attractive due to the demand for eco-friendly and sustainable agriculture. In this study, salt tolerant deep-sea actinobacterium, Dermacoccus abyssi MT1.1T was investigated plant growth promotion and salt stress mitigation in tomato seedlings. In addition, D. abyssi MT1.1T whole genome was analyzed for plant growth promoting traits and genes related to salt stress alleviation in plants. We also evaluated the biosafety of this strain on human health and organisms in the environment. Our results highlight that the inoculation of D. abyssi MT1.1T could reduce the negative effects of salt stress in tomato seedlings by growth improvement, total soluble sugars accumulation and hydrogen peroxide reduction. Moreover, this strain could survive and colonize tomato roots. Biosafety testing and genome analysis of D. abyssi MT1.1T showed no pathogenicity risk. In conclusion, we provide supporting evidence on the potential of D. abyssi MT1.1T as a safe strain for use in plant growth promotion under salt stress. Abstract Salt stress is a serious agricultural problem threatens plant growth and development resulted in productivity loss and global food security concerns. Salt tolerant plant growth promoting actinobacteria, especially deep-sea actinobacteria are an alternative strategy to mitigate deleterious effects of salt stress. In this study, we aimed to investigate the potential of deep-sea Dermacoccus abyssi MT1.1T to mitigate salt stress in tomato seedlings and identified genes related to plant growth promotion and salt stress mitigation. D. abyssi MT1.1T exhibited plant growth promoting traits namely indole-3-acetic acid (IAA) and siderophore production and phosphate solubilization under 0, 150, 300, and 450 mM NaCl in vitro. Inoculation of D. abyssi MT1.1T improved tomato seedlings growth in terms of shoot length and dry weight compared with non-inoculated seedlings under 150 mM NaCl. In addition, increased total soluble sugar and total chlorophyll content and decreased hydrogen peroxide content were observed in tomato inoculated with D. abyssi MT1.1T. These results suggested that this strain mitigated salt stress in tomatoes via osmoregulation by accumulation of soluble sugars and H2O2 scavenging activity. Genome analysis data supported plant growth promoting and salt stress mitigation potential of D. abyssi MT1.1T. Survival and colonization of D. abyssi MT1.1T were observed in roots of inoculated tomato seedlings. Biosafety testing on D. abyssi MT1.1T and in silico analysis of its whole genome sequence revealed no evidence of its pathogenicity. Our results demonstrate the potential of deep-sea D. abyssi MT1.1T to mitigate salt stress in tomato seedlings and as a candidate of eco-friendly bio-inoculants for sustainable agriculture.
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Affiliation(s)
- Pharada Rangseekaew
- Doctor of Philosophy Program in Applied Microbiology (International Program) in Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;
- Graduate School, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Adoración Barros-Rodríguez
- Department of Microbiology, Institute for Water Research, University of Granada, 18071 Granada, Spain; (A.B.-R.); (M.M.)
| | - Wasu Pathom-aree
- Research Center in Bioresources for Agriculture, Industry and Medicine, Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
- Correspondence: ; Tel.: +66-53943346-48
| | - Maximino Manzanera
- Department of Microbiology, Institute for Water Research, University of Granada, 18071 Granada, Spain; (A.B.-R.); (M.M.)
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Kamali M, Guo D, Naeimi S, Ahmadi J. Perception of Biocontrol Potential of Bacillus inaquosorum KR2-7 against Tomato Fusarium Wilt through Merging Genome Mining with Chemical Analysis. BIOLOGY 2022; 11:biology11010137. [PMID: 35053135 PMCID: PMC8773019 DOI: 10.3390/biology11010137] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 01/10/2022] [Accepted: 01/10/2022] [Indexed: 12/31/2022]
Abstract
Simple Summary Bacillus is a bacterial genus that is widely used as a promising alternative to chemical pesticides due to its protective activity toward economically important plant pathogens. Fusarium wilt of tomato is a serious fungal disease limiting tomato production worldwide. Recently, the newly isolated B. inaquosorum strain KR2-7 considerably suppressed Fusarium wilt of tomato plants. The present study was performed to perceive potential direct and indirect biocontrol mechanisms implemented by KR2-7 against this disease through genome and chemical analysis. The potential direct biocontrol mechanisms of KR2-7 were determined through the identification of genes involved in the synthesis of antibiotically active compounds suppressing tomato Fusarium wilt. Furthermore, the indirect mechanisms of this bacterium were perceived through recognizing genes that contributed to the resource acquisition or modulation of plant hormone levels. This is the first study that aimed at the modes of actions of B. inaquosorum against Fusarium wilt of tomatoes and the results strongly indicate that strain KR2-7 could be a good candidate for microbial biopesticide formulations to be used for biological control of plant diseases and plant growth promotion. Abstract Tomato Fusarium wilt, caused by Fusarium oxysporum f. sp. lycopersici (Fol), is a destructive disease that threatens the agricultural production of tomatoes. In the present study, the biocontrol potential of strain KR2-7 against Fol was investigated through integrated genome mining and chemical analysis. Strain KR2-7 was identified as B. inaquosorum based on phylogenetic analysis. Through the genome mining of strain KR2-7, we identified nine antifungal and antibacterial compound biosynthetic gene clusters (BGCs) including fengycin, surfactin and Bacillomycin F, bacillaene, macrolactin, sporulation killing factor (skf), subtilosin A, bacilysin, and bacillibactin. The corresponding compounds were confirmed through MALDI-TOF-MS chemical analysis. The gene/gene clusters involved in plant colonization, plant growth promotion, and induced systemic resistance were also identified in the KR2-7 genome, and their related secondary metabolites were detected. In light of these results, the biocontrol potential of strain KR2-7 against tomato Fusarium wilt was identified. This study highlights the potential to use strain KR2-7 as a plant-growth promotion agent.
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Affiliation(s)
- Maedeh Kamali
- College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Hong Kong, China;
| | - Dianjing Guo
- State Key Laboratory of Agrobiotechnology and School of Life Sciences, Chinese University of Hong Kong, Hong Kong, China
- Correspondence: ; Tel.: +852-3943-6298
| | - Shahram Naeimi
- Department of Biological Control Research, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran 19858-13111, Iran;
| | - Jafar Ahmadi
- Department of Genetics and Plant Breeding, Imam Khomeini International University, Qazvin 34149-16818, Iran;
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Jiménez-Mejía R, Medina-Estrada RI, Carballar-Hernández S, Orozco-Mosqueda MDC, Santoyo G, Loeza-Lara PD. Teamwork to Survive in Hostile Soils: Use of Plant Growth-Promoting Bacteria to Ameliorate Soil Salinity Stress in Crops. Microorganisms 2022; 10:150. [PMID: 35056599 PMCID: PMC8781547 DOI: 10.3390/microorganisms10010150] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/06/2022] [Accepted: 01/07/2022] [Indexed: 11/30/2022] Open
Abstract
Plants and their microbiomes, including plant growth-promoting bacteria (PGPB), can work as a team to reduce the adverse effects of different types of stress, including drought, heat, cold, and heavy metals stresses, as well as salinity in soils. These abiotic stresses are reviewed here, with an emphasis on salinity and its negative consequences on crops, due to their wide presence in cultivable soils around the world. Likewise, the factors that stimulate the salinity of soils and their impact on microbial diversity and plant physiology were also analyzed. In addition, the saline soils that exist in Mexico were analyzed as a case study. We also made some proposals for a more extensive use of bacterial bioinoculants in agriculture, particularly in developing countries. Finally, PGPB are highly relevant and extremely helpful in counteracting the toxic effects of soil salinity and improving crop growth and production; therefore, their use should be intensively promoted.
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Affiliation(s)
- Rafael Jiménez-Mejía
- Licenciatura en Genómica Alimentaria, Universidad de La Ciénega del Estado de Michoacán de Ocampo (UCEMICH), Sahuayo 59103, Mexico; (R.J.-M.); (R.I.M.-E.); (S.C.-H.)
| | - Ricardo I. Medina-Estrada
- Licenciatura en Genómica Alimentaria, Universidad de La Ciénega del Estado de Michoacán de Ocampo (UCEMICH), Sahuayo 59103, Mexico; (R.J.-M.); (R.I.M.-E.); (S.C.-H.)
| | - Santos Carballar-Hernández
- Licenciatura en Genómica Alimentaria, Universidad de La Ciénega del Estado de Michoacán de Ocampo (UCEMICH), Sahuayo 59103, Mexico; (R.J.-M.); (R.I.M.-E.); (S.C.-H.)
| | - Ma. del Carmen Orozco-Mosqueda
- Facultad de Agrobiología “Presidente Juárez”, Universidad Michoacana de San Nicolás de Hidalgo (UMSNH), Uruapan 60170, Mexico;
| | - Gustavo Santoyo
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo (UMSNH), Morelia 58030, Mexico;
| | - Pedro D. Loeza-Lara
- Licenciatura en Genómica Alimentaria, Universidad de La Ciénega del Estado de Michoacán de Ocampo (UCEMICH), Sahuayo 59103, Mexico; (R.J.-M.); (R.I.M.-E.); (S.C.-H.)
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Halotolerant Rhizobacteria for Salinity-Stress Mitigation: Diversity, Mechanisms and Molecular Approaches. SUSTAINABILITY 2022. [DOI: 10.3390/su14010490] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Agriculture is the best foundation for human livelihoods, and, in this respect, crop production has been forced to adopt sustainable farming practices. However, soil salinity severely affects crop growth, the degradation of soil quality, and fertility in many countries of the world. This results in the loss of profitability, the growth of agricultural yields, and the step-by-step decline of the soil nutrient content. Thus, researchers have focused on searching for halotolerant and plant growth-promoting bacteria (PGPB) to increase soil fertility and productivity. The beneficial bacteria are frequently connected with the plant rhizosphere and can alleviate plant growth under salinity stress through direct or indirect mechanisms. In this context, PGPB have attained a unique position. The responses include an increased rate of photosynthesis, high production of antioxidants, osmolyte accumulation, decreased Na+ ions, maintenance of the water balance, a high germination rate, and well-developed root and shoot elongation under salt-stress conditions. Therefore, the use of PGPB as bioformulations under salinity stress has been an emerging research avenue for the last few years, and applications of biopesticides and biofertilizers are being considered as alternative tools for sustainable agriculture, as they are ecofriendly and minimize all kinds of stresses. Halotolerant PGPB possess greater potential for use in salinity-affected soil as sustainable bioinoculants and for the bioremediation of salt-affected soil.
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Wang G, Li B, Peng D, Zhao H, Lu M, Zhang L, Li J, Zhang S, Guan C, Ji J. Combined application of H 2S and a plant growth promoting strain JIL321 regulates photosynthetic efficacy, soil enzyme activity and growth-promotion in rice under salt stress. Microbiol Res 2021; 256:126943. [PMID: 34953293 DOI: 10.1016/j.micres.2021.126943] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Revised: 12/09/2021] [Accepted: 12/10/2021] [Indexed: 11/16/2022]
Abstract
Salinity stress is one of the most harmful abiotic stresses that inhibit crop growth and grain yield. In this study, a salt-tolerant bacterium was isolated from the soil of the rice rhizosphere and named Myroides sp. JIL321, based on the results of the phylogenetic tree analysis. The strain JIL321 tolerated up to 1, 283.37 mM of NaCl and exhibited positive plant growth-promoting traits, such as the production of indole acetic acid (IAA) and 1-aminocyclopropane-1-carboxylate (ACC) deaminase. Therefore, the effects of JIL321 on rice (Oryza sativa L.) under salinity stress were determined. The inoculation of strain JIL321 significantly increased the chlorophyll content and the accumulation of osmotic adjustment substances, such as proline and soluble sugars, in rice expose to salt stress. Additionally, strain JIL321 inoculation significantly enhanced the activities of some enzymes commonly found in soil, such as urease, invertase and catalase. Moreover, the production of hydrogen sulfide (H2S), a pivotal signaling molecule, was also induced in rice by salt stress. Treatment with sodium hydrogen sulfide (NaHS, H2S donor) improved salt stress tolerance of the rice, while treatment with hypotaurine (HT, H2S scavenger) significantly suppressed it. Interestingly, NaHS treatment also improved the production of IAA and ACC deaminase in strain JIL321 under 0 mM and 150 mM salt concentrations. The combined treatment of JIL321 and NaHS could further improve the growth of salt-stressed rice seedlings, most likely due to the interaction effect between H2S and strain JIL321. To our knowledge, this study is the first to demonstrate that the combined use of H2S and plant growth-promoting bacteria could alleviate the adverse effects of salt stress on rice plants, and further verifies the novel role of H2S as a signaling molecule that enhance the tolerance of plant to abiotic stresses.
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Affiliation(s)
- Gang Wang
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Bowen Li
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Danliu Peng
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Hongzhi Zhao
- MOE Key Laboratory on Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, 300350, Tianjin, China
| | - Mingyang Lu
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Lishuang Zhang
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Jiali Li
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Songhao Zhang
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China
| | - Chunfeng Guan
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
| | - Jing Ji
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
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Naing AH, Maung TT, Kim CK. The ACC deaminase-producing plant growth-promoting bacteria: Influences of bacterial strains and ACC deaminase activities in plant tolerance to abiotic stress. PHYSIOLOGIA PLANTARUM 2021; 173:1992-2012. [PMID: 34487352 DOI: 10.1111/ppl.13545] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 08/17/2021] [Accepted: 08/27/2021] [Indexed: 05/02/2023]
Abstract
Global climate change results in frequent occurrences and/or long durations of abiotic stress. Field grown plants are affected by abiotic stress, and they modulate ethylene in response to abiotic stress exposure and use it as a signaling molecule in stress tolerance mechanisms. However, frequent occurrences and/or long durations of stress conditions can cause plants to induce ethylene levels higher than their thresholds, resulting in a reduction of plant growth and crop productivity. The use of plant growth-promoting bacteria (PGPB) that produce 1-aminocyclopropane-1-carboxylate (ACC) deaminase has increased in various plant species to ameliorate the deleterious effects of stress-induced ethylene and promote plant growth despite abiotic stress conditions. Unfortunately, there are restrictions that limit the use of ACC deaminase-producing PGPB to protect plants from abiotic stresses. This review describes how abiotic stress induces ethylene and how stress-induced ethylene adversely affects plant growth. In addition, this review emphasizes the importance of the compatibility of PGPB strains and specific host plants and ACC deaminase activities in the reduction of stress ethylene and the promotion of plant growth, based on the research published in the last 10 years. Moreover, due to the restrictions in PGPB use, this review highlights the potential generation of transgenic plants expressing the AcdS gene that encodes the ACC deaminase enzyme as a substitute for PGPB in the future to support and uplift agricultural sustainability and food security globally.
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Affiliation(s)
- Aung Htay Naing
- Department of Horticulture, Kyungpook National University, Daegu, Korea
| | - The-Thiri Maung
- Department of Food Science and Technology, Kongju National University, Yesan, Korea
| | - Chang Kil Kim
- Department of Horticulture, Kyungpook National University, Daegu, Korea
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Pseudomonas 1-Aminocyclopropane-1-carboxylate (ACC) Deaminase and Its Role in Beneficial Plant-Microbe Interactions. Microorganisms 2021; 9:microorganisms9122467. [PMID: 34946069 PMCID: PMC8707671 DOI: 10.3390/microorganisms9122467] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 11/26/2021] [Accepted: 11/26/2021] [Indexed: 12/02/2022] Open
Abstract
The expression of the enzyme 1-aminocylopropane-1-carboxylate (ACC) deaminase, and the consequent modulation of plant ACC and ethylene concentrations, is one of the most important features of plant-associated bacteria. By decreasing plant ACC and ethylene concentrations, ACC deaminase-producing bacteria can overcome some of the deleterious effects of inhibitory levels of ACC and ethylene in various aspects of plant-microbe interactions, as well as plant growth and development (especially under stressful conditions). As a result, the acdS gene, encoding ACC deaminase, is often prevalent and positively selected in the microbiome of plants. Several members of the genus Pseudomonas are widely prevalent in the microbiome of plants worldwide. Due to its adaptation to a plant-associated lifestyle many Pseudomonas strains are of great interest for the development of novel sustainable agricultural and biotechnological solutions, especially those presenting ACC deaminase activity. This manuscript discusses several aspects of ACC deaminase and its role in the increased plant growth promotion, plant protection against abiotic and biotic stress and promotion of the rhizobial nodulation process by Pseudomonas. Knowledge regarding the properties and actions of ACC deaminase-producing Pseudomonas is key for a better understanding of plant-microbe interactions and the selection of highly effective strains for various applications in agriculture and biotechnology.
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Nascimento FX, Urón P, Glick BR, Giachini A, Rossi MJ. Genomic Analysis of the 1-Aminocyclopropane-1-Carboxylate Deaminase-Producing Pseudomonas thivervalensis SC5 Reveals Its Multifaceted Roles in Soil and in Beneficial Interactions With Plants. Front Microbiol 2021; 12:752288. [PMID: 34659189 PMCID: PMC8515041 DOI: 10.3389/fmicb.2021.752288] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 08/31/2021] [Indexed: 11/13/2022] Open
Abstract
Beneficial 1-aminocyclopropane-1-carboxylate (ACC) deaminase-producing bacteria promote plant growth and stress resistance, constituting a sustainable alternative to the excessive use of chemicals in agriculture. In this work, the increased plant growth promotion activity of the ACC deaminase-producing Pseudomonas thivervalensis SC5, its ability to limit the growth of phytopathogens, and the genomics behind these important properties are described in detail. P. thivervalensis SC5 displayed several active plant growth promotion traits and significantly increased cucumber plant growth and resistance against salt stress (100mmol/L NaCl) under greenhouse conditions. Strain SC5 also limited the in vitro growth of the pathogens Botrytis cinerea and Pseudomonas syringae DC3000 indicating active biological control activities. Comprehensive analysis revealed that P. thivervalensis SC5 genome is rich in genetic elements involved in nutrient acquisition (N, P, S, and Fe); osmotic stress tolerance (e.g., glycine-betaine, trehalose, and ectoine biosynthesis); motility, chemotaxis and attachment to plant tissues; root exudate metabolism including the modulation of plant phenolics (e.g., hydroxycinnamic acids), lignin, and flavonoids (e.g., quercetin); resistance against plant defenses (e.g., reactive oxygens species-ROS); plant hormone modulation (e.g., ethylene, auxins, cytokinins, and salicylic acid), and bacterial and fungal phytopathogen antagonistic traits (e.g., 2,4-diacetylphloroglucinol, HCN, a fragin-like non ribosomal peptide, bacteriocins, a lantipeptide, and quorum-quenching activities), bringing detailed insights into the action of this versatile plant-growth-promoting bacterium. Ultimately, the combination of both increased plant growth promotion/protection and biological control abilities makes P. thivervalensis SC5 a prime candidate for its development as a biofertilizer/biostimulant/biocontrol product. The genomic analysis of this bacterium brings new insights into the functioning of Pseudomonas and their role in beneficial plant-microbe interactions.
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Affiliation(s)
- Francisco X Nascimento
- iBET, Instituto de Biologia Experimental e Tecnológica, Oeiras, Portugal.,Laboratório de Microbiologia e Bioprocessos, Departamento de Microbiologia, Universidade Federal de Santa Catarina, Florianópolis, Brazil
| | - Paola Urón
- Laboratório de Microbiologia e Bioprocessos, Departamento de Microbiologia, Universidade Federal de Santa Catarina, Florianópolis, Brazil
| | - Bernard R Glick
- Department of Biology, University of Waterloo, Waterloo, ON, Canada
| | - Admir Giachini
- Laboratório de Microbiologia e Bioprocessos, Departamento de Microbiologia, Universidade Federal de Santa Catarina, Florianópolis, Brazil
| | - Márcio J Rossi
- Laboratório de Microbiologia e Bioprocessos, Departamento de Microbiologia, Universidade Federal de Santa Catarina, Florianópolis, Brazil
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Guo J, Chen Y, Lu P, Liu M, Sun P, Zhang Z. Roles of endophytic bacteria in Suaeda salsa grown in coastal wetlands: Plant growth characteristics and salt tolerance mechanisms. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 287:117641. [PMID: 34426384 DOI: 10.1016/j.envpol.2021.117641] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 05/24/2021] [Accepted: 06/20/2021] [Indexed: 05/11/2023]
Abstract
Salinity is a limiting factor in the growth of plants in coastal wetlands. The interaction of halophytes with salt-tolerant endophytes has been one of the major concerns in this area. However, the mechanism by which endophytes promote halophyte growth remains unclear. The growth and physiological responses of Suaeda salsa inoculated with endophytic bacteria (Sphingomonas prati and Sphingomonas zeicaulis) at 0 ‰ and 20 ‰ NaCl were studied. The results showed that Sphingomonas zeicaulis had stronger positive effects on the growth of Suaeda salsa under 0 ‰ NaCl, and Sphingomonas prati performed better under 20 ‰ NaCl. Sphingomonas prati inoculation increased the mean height, root length, fresh weight and dry weight by 45.43%, 9.91%, 82.00% and 102.25%, respectively, compared with the uninoculated treatment at 20 ‰ NaCl. Sphingomonas prati inoculation decreased MDA content by 23.78%, while the soluble sugar and soluble protein contents increased by 15.08% and 12.57%, respectively, compared to the control, at 20 ‰ NaCl. Increases in SOD and CAT in the Sphingomonas prati inoculation were 1.03 and 1.47-fold greater, respectively, than in the Sphingomonas zeicaulis inoculation, under 20 ‰ NaCl. Moreover, Sphingomonas prati and Sphingomonas zeicaulis had antagonistic interactions in Suaeda salsa according to the results of the "interaction equation" (most G values were negative). PCA, clustering analysis and the PLS model revealed two mechanisms for regulating plant salt tolerance by which Sphingomonas prati enhanced Suaeda salsa growth: (1) Sphingomonas prati improved intracellular osmotic metabolism and (2) Sphingomonas prati promoted the production of CAT in the antioxidant enzyme system and retained permeability. This study provides new insight into the comprehensive understanding and evaluation of endophytic bacteria as biological inoculants in plants under salt stress.
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Affiliation(s)
- Jiameng Guo
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, China
| | - Youyuan Chen
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, China; Key Laboratory of Marine Environment and Ecology, Ministry of Education of China, Ocean University of China, Qingdao, China; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao, China.
| | - Pengzhan Lu
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, China
| | - Ming Liu
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, China
| | - Ping Sun
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, China
| | - Zhiming Zhang
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, China; Key Laboratory of Marine Environment and Ecology, Ministry of Education of China, Ocean University of China, Qingdao, China; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao, China
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Fiodor A, Singh S, Pranaw K. The Contrivance of Plant Growth Promoting Microbes to Mitigate Climate Change Impact in Agriculture. Microorganisms 2021; 9:1841. [PMID: 34576736 PMCID: PMC8472176 DOI: 10.3390/microorganisms9091841] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/14/2021] [Accepted: 08/27/2021] [Indexed: 01/07/2023] Open
Abstract
Combating the consequences of climate change is extremely important and critical in the context of feeding the world's population. Crop simulation models have been extensively studied recently to investigate the impact of climate change on agricultural productivity and food security. Drought and salinity are major environmental stresses that cause changes in the physiological, biochemical, and molecular processes in plants, resulting in significant crop productivity losses. Excessive use of chemicals has become a severe threat to human health and the environment. The use of beneficial microorganisms is an environmentally friendly method of increasing crop yield under environmental stress conditions. These microbes enhance plant growth through various mechanisms such as production of hormones, ACC deaminase, VOCs and EPS, and modulate hormone synthesis and other metabolites in plants. This review aims to decipher the effect of plant growth promoting bacteria (PGPB) on plant health under abiotic soil stresses associated with global climate change (viz., drought and salinity). The application of stress-resistant PGPB may not only help in the combating the effects of abiotic stressors, but also lead to mitigation of climate change. More thorough molecular level studies are needed in the future to assess their cumulative influence on plant development.
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Affiliation(s)
- Angelika Fiodor
- Department of Environmental Microbiology and Biotechnology, Institute of Microbiology, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland;
| | - Surender Singh
- Department of Microbiology, Central University of Haryana, Mahendergarh 123031, Haryana, India;
| | - Kumar Pranaw
- Department of Environmental Microbiology and Biotechnology, Institute of Microbiology, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland;
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Evaluation of Indigenous Olive Biocontrol Rhizobacteria as Protectants against Drought and Salt Stress. Microorganisms 2021; 9:microorganisms9061209. [PMID: 34204989 PMCID: PMC8230297 DOI: 10.3390/microorganisms9061209] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 05/27/2021] [Accepted: 06/01/2021] [Indexed: 11/24/2022] Open
Abstract
Stress caused by drought and salinity may compromise growth and productivity of olive (Olea europaea L.) tree crops. Several studies have reported the use of beneficial rhizobacteria to alleviate symptoms produced by these stresses, which is attributed in some cases to the activity of 1-aminocyclopropane-1-carboxylic acid deaminase (ACD). A collection of beneficial olive rhizobacteria was in vitro screened for ACD activity. Pseudomonas sp. PICF6 displayed this phenotype and sequencing of its genome confirmed the presence of an acdS gene. In contrast, the well-known root endophyte and biocontrol agent Pseudomonas simiae PICF7 was defective in ACD activity, even though the presence of an ACD-coding gene was earlier predicted in its genome. In this study, an unidentified deaminase was confirmed instead. Greenhouse experiments with olive ‘Picual’ plants inoculated either with PICF6 or PICF7, or co-inoculated with both strains, and subjected to drought or salt stress were carried out. Several physiological and biochemical parameters increased in stressed plants (i.e., stomatal conductance and flavonoids content), regardless of whether or not they were previously bacterized. Results showed that neither PICF6 (ACD positive) nor PICF7 (ACD negative) lessened the negative effects caused by the abiotic stresses tested, at least under our experimental conditions.
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Impact of Mycorrhization on Phosphorus Utilization Efficiency of Acacia gummifera and Retama monosperma under Salt Stress. FORESTS 2021. [DOI: 10.3390/f12050611] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The impact of salt stress on the growth and phosphorus utilization efficiency (PUE) of two leguminous species: Retama monosperma and Acacia gummifera was studied. The effectiveness of arbuscular mycorrhizal fungi (AMF) to mitigate salt stress was furthermore assessed. Growth, N and P tissue concentrations, mycorrhizal root colonization frequency and intensity, and P utilization efficiency (PUE) in the absence or presence of AMF were evaluated under no salt (0 mM L−1) and three salt (NaCl) concentrations of (25, 50 and 100 mM L−1) using a natural sterilized soil. A significant difference in mycorrhizal colonization intensity, root-to-shoot ratio, P uptake, PUE, and N uptake was observed between the legume species. Salt stress inhibited the shoot and root growth, and reduced P and N uptake by the legume species. Mycorrhizal inoculation aided to mitigate the effects of salt stress with an average increase of shoot and root growth responses by 35% and 32% in the inoculated than in the non-inoculated A. gummifera treatments. The average shoot and root growth responses were 37% and 45% higher in the inoculated compared to the non-inoculated treatments of R. monosperma. Average mycorrhizal shoot and root P uptake responses were 66% and 68% under A. gummifera, and 40% and 95% under R. monosperma, respectively. Mycorrhizal inoculated treatments consistently maintained lower PUE in the roots. The results provide insights for further investigations on the AMF conferred mechanisms to salt stress tolerance response by A. gummifera and R. monosperma, to enable the development of effective technologies for sustainable afforestation and reforestation programs in the Atlantic coast of Morocco.
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Santoyo G, Gamalero E, Glick BR. Mycorrhizal-Bacterial Amelioration of Plant Abiotic and Biotic Stress. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2021. [DOI: 10.3389/fsufs.2021.672881] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Soil microbiota plays an important role in the sustainable production of the different types of agrosystems. Among the members of the plant microbiota, mycorrhizal fungi (MF) and plant growth-promoting bacteria (PGPB) interact in rhizospheric environments leading to additive and/or synergistic effects on plant growth and heath. In this manuscript, the main mechanisms used by MF and PGPB to facilitate plant growth are reviewed, including the improvement of nutrient uptake, and the reduction of ethylene levels or biocontrol of potential pathogens, under both normal and stressful conditions due to abiotic or biotic factors. Finally, it is necessary to expand both research and field use of bioinoculants based on these components and take advantage of their beneficial interactions with plants to alleviate plant stress and improve plant growth and production to satisfy the demand for food for an ever-increasing human population.
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Medeiros CAA, Bettiol W. Multifaceted intervention of Bacillus spp. against salinity stress and Fusarium wilt in tomato. J Appl Microbiol 2021; 131:2387-2401. [PMID: 33817910 DOI: 10.1111/jam.15095] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 03/26/2021] [Accepted: 03/31/2021] [Indexed: 01/25/2023]
Abstract
AIM This study aimed to screen halotolerant Bacillus strains able to promote growth and protect tomato plants against salt stress and Fusarium wilt (Fusarium oxysporum f. sp. lycopersici). METHODS AND RESULTS We evaluated some halotolerant strains of Bacillus spp. (Bacillus velezensis (AP-3) and Bacillus spp. (AP-6, AP-85 and AP-100)) to promote growth of tomato plants grown under salinity stress conditions and to protect them against Fusarium wilt disease. Such strains had been previously selected among 154 bacterial strains through biochemical tests (siderophores and indoleacetic acid productions, cellulase and catalase activity, nitrogen fixation and phosphate solubilization) in the presence of 100-mmol l-1 NaCl. Besides the above-mentioned strains, B. subtilis QST-713 (SerenadeTM ) was also evaluated. Compared to control plants, aboveground dry weight increased in plants inoculated with AP-6, AP-85, AP-3, AP-100 and QST-713 strains developed in the absence of salt stress. The same tendency occurred for root dry weight; however, AP-3 strain was more effective, promoting an increase of 163%, when compared to control. Chlorophyll index and height increased >40 and 53%, respectively, for all Bacillus strains. Saline stress reduced plant growth regardless of the presence of Bacillus. Height, stem diameter, and aboveground and root dry weights increased in plants treated with Bacillus strains grown under saline conditions when compared to control. Bacillus velezensis AP-3 reduced the severity of Fusarium wilt in tomato by 50% when compared to control. CONCLUSION Halotolerant Bacillus strains controlled tomato Fusarium wilt, increased growth as well as tolerance to salt stress. SIGNIFICANCE AND IMPACT OF THE STUDY We demonstrated the efficacy of halotolerant Bacillus strains to control Fusarium wilt and improve tomato growth. We also demonstrated that these Bacillus strains protect tomato plants against salt stress. Bacillus can be used in an eco-friendly way because they are considered Generally Recognized As Safe.
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Affiliation(s)
- C A A Medeiros
- Faculdade de Ciências Agronômicas, Campus Fazenda Lageado, Departamento de Proteção Vegetal, Universidade Estadual Paulista "Júlio de Mesquita Filho", Botucatu, Brazil
| | - W Bettiol
- Embrapa Meio Ambiente, Jaguariúna, Brazil
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Ha-Tran DM, Nguyen TTM, Hung SH, Huang E, Huang CC. Roles of Plant Growth-Promoting Rhizobacteria (PGPR) in Stimulating Salinity Stress Defense in Plants: A Review. Int J Mol Sci 2021; 22:3154. [PMID: 33808829 PMCID: PMC8003591 DOI: 10.3390/ijms22063154] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 03/17/2021] [Accepted: 03/18/2021] [Indexed: 12/14/2022] Open
Abstract
To date, soil salinity becomes a huge obstacle for food production worldwide since salt stress is one of the major factors limiting agricultural productivity. It is estimated that a significant loss of crops (20-50%) would be due to drought and salinity. To embark upon this harsh situation, numerous strategies such as plant breeding, plant genetic engineering, and a large variety of agricultural practices including the applications of plant growth-promoting rhizobacteria (PGPR) and seed biopriming technique have been developed to improve plant defense system against salt stress, resulting in higher crop yields to meet human's increasing food demand in the future. In the present review, we update and discuss the advantageous roles of beneficial PGPR as green bioinoculants in mitigating the burden of high saline conditions on morphological parameters and on physio-biochemical attributes of plant crops via diverse mechanisms. In addition, the applications of PGPR as a useful tool in seed biopriming technique are also updated and discussed since this approach exhibits promising potentials in improving seed vigor, rapid seed germination, and seedling growth uniformity. Furthermore, the controversial findings regarding the fluctuation of antioxidants and osmolytes in PGPR-treated plants are also pointed out and discussed.
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Affiliation(s)
- Dung Minh Ha-Tran
- Molecular and Biological Agricultural Sciences Program, Taiwan International Graduate Program, Academia Sinica and National Chung Hsing University, Taipei 11529, Taiwan;
- Department of Life Sciences, National Chung Hsing University, Taichung 40227, Taiwan; (T.T.M.N.); (S.-H.H.)
- Graduate Institute of Biotechnology, National Chung Hsing University, Taichung 40227, Taiwan
| | - Trinh Thi My Nguyen
- Department of Life Sciences, National Chung Hsing University, Taichung 40227, Taiwan; (T.T.M.N.); (S.-H.H.)
| | - Shih-Hsun Hung
- Department of Life Sciences, National Chung Hsing University, Taichung 40227, Taiwan; (T.T.M.N.); (S.-H.H.)
- Department of Horticulture, National Chung Hsing University, Taichung 40227, Taiwan
| | - Eugene Huang
- College of Agriculture and Natural Resources, National Chung Hsing University, Taichung 40227, Taiwan;
| | - Chieh-Chen Huang
- Department of Life Sciences, National Chung Hsing University, Taichung 40227, Taiwan; (T.T.M.N.); (S.-H.H.)
- Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung 40227, Taiwan
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