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Castañeda-Barreto A, Olivera-Gonzales P, Tamariz-Angeles C. A natural consortium of thermophilic bacteria from Huancarhuaz hot spring (Ancash-Peru) for promising lignocellulose bioconversion. Heliyon 2024; 10:e27272. [PMID: 38486736 PMCID: PMC10937689 DOI: 10.1016/j.heliyon.2024.e27272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 02/14/2024] [Accepted: 02/27/2024] [Indexed: 03/17/2024] Open
Abstract
The lignocellulose bioconversion process is an eco-friendly and green-economy alternative technology that allows the reduction of pollution and global warming, so it is necessary for thermophilic and thermostable hydrolytic enzymes from natural sources. This research aimed to isolate cellulolytic and xylanolytic microbial consortia from Huancarhuaz hot spring (Peru) from sludge or in situ baiting cultured with or without sugarcane bagasse. According to the hydrolytic activities consortium T4 from in situ baiting was selected. It was cultivated in submerged fermentation at 65 °C, pH 6.5 for eight days using LB supplemented with sugar cane bagasse (SCB), pine wood sawdust (PWS), CMC, xylan of birchwood, or micro granular cellulose. Crude extract of culture supplemented with SCB (T4B) showed better endoglucanase and xylanase activities with higher activities at 75 °C and pH 6. In these conditions, cellulase activity was kept up to 57% after 1 h of incubation, while xylanase activity was up to 63% after 72 h. Furthermore, this crude extract released reduced sugars from pretreated SCB and PWS. According to metagenomic analysis of 16S rDNA, Geobacillus was the predominant genus. It was found thermostable genes: a type of endoglucanase (GH5), an endo-xylanase (GH10), and alkali xylanase (GH10) previously reported in Geobacillus sp. strains. Finally, Huancarhuaz hot spring harbors a genetic microbial diversity for lignocellulosic waste bioconversion in high temperatures, and the T4B consortium will be a promising source of novel extreme condition stable enzymes for the saccharification process.
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Affiliation(s)
- Alberto Castañeda-Barreto
- Facultad de Ciencias del Ambiente, Universidad Nacional Santiago Antúnez de Mayolo, Av. Centenario 200, 02002, Independencia, Huaraz, Ancash, Peru
| | - Percy Olivera-Gonzales
- Centro de Investigación de la Biodiversidad y Recursos Genéticos de Ancash, Facultad de Ciencias, Universidad Nacional Santiago Antúnez de Mayolo, Av. Centenario 200, 02002, Independencia, Huaraz, Ancash, Peru
| | - Carmen Tamariz-Angeles
- Centro de Investigación de la Biodiversidad y Recursos Genéticos de Ancash, Facultad de Ciencias, Universidad Nacional Santiago Antúnez de Mayolo, Av. Centenario 200, 02002, Independencia, Huaraz, Ancash, Peru
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Nagy VD, Zhumakayev A, Vörös M, Bordé Á, Szarvas A, Szűcs A, Kocsubé S, Jakab P, Monostori T, Škrbić BD, Mohai E, Hatvani L, Vágvölgyi C, Kredics L. Development of a Multicomponent Microbiological Soil Inoculant and Its Performance in Sweet Potato Cultivation. Microorganisms 2023; 11:microorganisms11040914. [PMID: 37110337 PMCID: PMC10143537 DOI: 10.3390/microorganisms11040914] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 03/27/2023] [Accepted: 03/29/2023] [Indexed: 04/03/2023] Open
Abstract
The cultivation and consumption of sweet potato (Ipomoea batatas) are increasing globally. As the usage of chemical fertilizers and pest control agents during its cultivation may lead to soil, water and air pollution, there is an emerging need for environment-friendly, biological solutions enabling increased amounts of healthy crop and efficient disease management. Microbiological agents for agricultural purposes gained increasing importance in the past few decades. Our goal was to develop an agricultural soil inoculant from multiple microorganisms and test its application potential in sweet potato cultivation. Two Trichoderma strains were selected: Trichoderma ghanense strain SZMC 25217 based on its extracellular enzyme activities for the biodegradation of plant residues, and Trichoderma afroharzianum strain SZMC 25231 for biocontrol purposes against fungal plant pathogens. The Bacillus velezensis strain SZMC 24986 proved to be the best growth inhibitor of most of the nine tested strains of fungal species known as plant pathogens, therefore it was also selected for biocontrol purposes against fungal plant pathogens. Arthrobacter globiformis strain SZMC 25081, showing the fastest growth on nitrogen-free medium, was selected as a component with possible nitrogen-fixing potential. A Pseudomonas resinovorans strain, SZMC 25872, was selected for its ability to produce indole-3-acetic acid, which is among the important traits of potential plant growth-promoting rhizobacteria (PGPR). A series of experiments were performed to test the selected strains for their tolerance to abiotic stress factors such as pH, temperature, water activity and fungicides, influencing the survivability in agricultural environments. The selected strains were used to treat sweet potato in two separate field experiments. Yield increase was observed for the plants treated with the selected microbial consortium (synthetic community) in comparison with the control group in both cases. Our results suggest that the developed microbial inoculant has the potential to be used in sweet potato plantations. To the best of our knowledge, this is the first report about the successful application of a fungal-bacterial consortium in sweet potato cultivation.
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Affiliation(s)
- Viktor Dávid Nagy
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Anuar Zhumakayev
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Mónika Vörös
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Ádám Bordé
- Faculty of Agriculture, University of Szeged, Andrássy Street 15, 6800 Hódmezővásárhely, Hungary
| | - Adrienn Szarvas
- Faculty of Agriculture, University of Szeged, Andrássy Street 15, 6800 Hódmezővásárhely, Hungary
| | - Attila Szűcs
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Sándor Kocsubé
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Péter Jakab
- Faculty of Agriculture, University of Szeged, Andrássy Street 15, 6800 Hódmezővásárhely, Hungary
| | - Tamás Monostori
- Faculty of Agriculture, University of Szeged, Andrássy Street 15, 6800 Hódmezővásárhely, Hungary
| | - Biljana D. Škrbić
- Faculty of Technology, University of Novi Sad, Bulevar cara Lazara 1, 21000 Novi Sad, Serbia
| | - Edina Mohai
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Lóránt Hatvani
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - Csaba Vágvölgyi
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
| | - László Kredics
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, 6726 Szeged, Hungary
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Mahdi I, Allaoui A, Fahsi N, Biskri L. Bacillus velezensis QA2 Potentially Induced Salt Stress Tolerance and Enhanced Phosphate Uptake in Quinoa Plants. Microorganisms 2022; 10:microorganisms10091836. [PMID: 36144437 PMCID: PMC9505587 DOI: 10.3390/microorganisms10091836] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 09/08/2022] [Accepted: 09/08/2022] [Indexed: 11/16/2022] Open
Abstract
Plant Growth-Promoting Rhizobacteria (PGPR) have attracted much attention in agriculture biotechnology as biological inputs to sustain crop production. The present study describes a halotolerant phosphate solubilizing bacterium associated with quinoa plant roots. Based on a metabolic screening, one bacterial isolate, named QA2, was selected and screened for PGPR traits. This isolate solubilized both inorganic phosphate and zinc, produced indole-3-acetic acid, ammonia, hydrogen cyanide, cellulase, and (to be deleted) protease, and induced biofilm formation. We demonstrated that QA2 exhibited both antimicrobial and ion metabolism activities and tolerated high salt concentration at up to 11% NaCl. Genotyping analyses, using 16S rRNA and chaperonin cpn60 genes, revealed that QA2 belongs to the species of Bacillus velezensis. Using the quinoa model cultivated under a saline condition, we demonstrated that QA2 promoted plant growth and mitigated the saline irrigation effects. Analysis of harvested plants revealed that QA2 induced a significant increase of both leaf chlorophyll index by 120.86% (p < 0.05) and P uptake by 41.17% (p < 0.05), while the content of Na+ was drastically decreased. Lastly, a bibliometric data analysis highlighted the panoramic view of studies carried out so far on B. velezensis strains. Our investigation presents a holistic view of the potential application of B. velezensis as a biological inoculant to promote plant growth, control pathogen attacks, and mitigate the salinity effect of quinoa plants. Further investigations are still needed to demonstrate these effects in field conditions.
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Affiliation(s)
- Ismail Mahdi
- Microbiology Laboratory, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Ben Guerir 43150, Morocco
| | - Abdelmounaaim Allaoui
- Microbiology Laboratory, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Ben Guerir 43150, Morocco
| | - Nidal Fahsi
- Microbiology Laboratory, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Ben Guerir 43150, Morocco
| | - Latefa Biskri
- Microbiology Laboratory, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Ben Guerir 43150, Morocco
- African Genome Center (AGC), Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Ben Guerir 43150, Morocco
- Correspondence: ; Tel.: +212-52502926
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Rincón-Molina CI, Martínez-Romero E, Aguirre-Noyola JL, Manzano-Gómez LA, Zenteno-Rojas A, Rogel MA, Rincón-Molina FA, Ruíz-Valdiviezo VM, Rincón-Rosales R. Bacterial Community with Plant Growth-Promoting Potential Associated to Pioneer Plants from an Active Mexican Volcanic Complex. Microorganisms 2022; 10:microorganisms10081568. [PMID: 36013987 PMCID: PMC9413462 DOI: 10.3390/microorganisms10081568] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 07/31/2022] [Accepted: 08/01/2022] [Indexed: 02/05/2023] Open
Abstract
Microorganisms in extreme volcanic environments play an important role in the development of plants on newly exposed substrates. In this work, we studied the structure and diversity of a bacterial community associated to Andropogon glomeratus and Cheilanthes aemula at El Chichón volcano. The genetic diversity of the strains was revealed by genomic fingerprints and by 16S rDNA gene sequencing. Furthermore, a metagenomic analysis of the rhizosphere samples was carried out for pioneer plants growing inside and outside the volcano. Multifunctional biochemical tests and plant inoculation assays were evaluated to determine their potential as plant growth-promoting bacteria (PGPB). Through metagenomic analysis, a total of 33 bacterial phyla were identified from A. glomeratus and C. aemula rhizosphere samples collected inside the volcano, and outside the volcano 23 bacterial phyla were identified. For both rhizosphere samples, proteobacteria was the most abundant phylum. With a cultivable approach, 174 bacterial strains were isolated from the rhizosphere and tissue of plants growing outside the volcanic complex. Isolates were classified within the genera Acinetobacter, Arthrobacter, Bacillus, Burkholderia, Cupriavidus, Enterobacter, Klebsiella, Lysinibacillus, Pantoea, Pseudomonas, Serratia, Stenotrophomonas and Pandoraea. The evaluated strains were able to produce indole compounds, solubilize phosphate, synthesize siderophores, showed ACC deaminase and nitrogenase activity, and they had a positive effect on the growth and development of Capsicum chinense. The wide diversity of bacteria associated to pioneer plants at El Chichón volcano with PGPB qualities represent an alternative for the recovery of eroded environments, and they can be used efficiently as biofertilizers for agricultural crops growing under adverse conditions.
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Affiliation(s)
- Clara Ivette Rincón-Molina
- Laboratorio de Ecología Genómica, Tecnológico Nacional de México, Instituto Tecnológico de Tuxtla Gutiérrez, C.P., Tuxtla Gutierrez 29050, Chiapas, Mexico
| | - Esperanza Martínez-Romero
- Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Av. Universidad s/n, Col. Chamilpa, C.P., Cuernavaca 62210, Morelos, Mexico
| | - José Luis Aguirre-Noyola
- Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Av. Universidad s/n, Col. Chamilpa, C.P., Cuernavaca 62210, Morelos, Mexico
| | - Luis Alberto Manzano-Gómez
- Departamento de Investigación y Desarrollo, 3R Biotec SA de CV, C.P., Tuxtla Gutierrez 29000, Chiapas, Mexico
| | - Adalberto Zenteno-Rojas
- Laboratorio de Ecología Genómica, Tecnológico Nacional de México, Instituto Tecnológico de Tuxtla Gutiérrez, C.P., Tuxtla Gutierrez 29050, Chiapas, Mexico
| | - Marco Antonio Rogel
- Centro de Ciencias Genómicas, Universidad Nacional Autónoma de México, Av. Universidad s/n, Col. Chamilpa, C.P., Cuernavaca 62210, Morelos, Mexico
| | - Francisco Alexander Rincón-Molina
- Laboratorio de Ecología Genómica, Tecnológico Nacional de México, Instituto Tecnológico de Tuxtla Gutiérrez, C.P., Tuxtla Gutierrez 29050, Chiapas, Mexico
| | - Víctor Manuel Ruíz-Valdiviezo
- Laboratorio de Ecología Genómica, Tecnológico Nacional de México, Instituto Tecnológico de Tuxtla Gutiérrez, C.P., Tuxtla Gutierrez 29050, Chiapas, Mexico
| | - Reiner Rincón-Rosales
- Laboratorio de Ecología Genómica, Tecnológico Nacional de México, Instituto Tecnológico de Tuxtla Gutiérrez, C.P., Tuxtla Gutierrez 29050, Chiapas, Mexico
- Correspondence: ; Tel.: +52-9616150461
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Desai S, Mistry J, Shah F, Chandwani S, Amaresan N, Supriya NR. Salt-tolerant bacteria enhance the growth of mung bean ( Vigna radiata L.) and uptake of nutrients, and mobilize sodium ions under salt stress condition. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2022; 25:66-73. [PMID: 35382669 DOI: 10.1080/15226514.2022.2057419] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Salinity is one of the significant abiotic stresses that exert harmful effects on plant growth and crop production. It has been reported that the harmfulness of salinity can be mitigated by the use of salt-tolerant plant growth-promoting (PGP) bacteria. In this study, four bacteria were selected from a total of 30 cultures, based on salt-tolerant and PGP properties. The isolates were found to produce indole acetic acid (8.49-19.42 μg/ml), siderophore (36.04-61.77%), and solubilize potassium and inorganic phosphate. Identification based on 16S rRNA gene sequencing revealed that the isolates belonged to Cronobacter (two isolates) and Enterobacter (two isolates). Inoculation of PGP bacteria under 2 and 10% salinity stress showed enhanced plant growth parameters in Vigna radiata compared to both salinity and non-salinity control plants. The rate of germination (113.32-206.64%), root length (128.79-525.31%), shoot length (34.09-50.32%), fresh weight, and dry weight were 3-fold higher in bacteria-treated seeds than control plants. The estimation of chlorophyll (1-5-fold), carotenoids (1-4-fold), and proline content (3.65-14.45%) was also higher compared to control plants. Further, the bacterized seeds showed enhanced nitrogen and phosphorous uptake and mobilized sodium ions from roots to leaves. Overall the strains SS4 and SS5 performed well in both 2 and 10% salt-amended soils. These strains could be formulated as a bioinoculant to mitigate the salinity stress in salinized soils.
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Affiliation(s)
- Shreya Desai
- C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Surat, India
| | - Jemisha Mistry
- C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Surat, India
| | - Firdosh Shah
- C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Surat, India
| | - Sapna Chandwani
- C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Surat, India
| | - Natarajan Amaresan
- C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Surat, India
| | - Naga Rathna Supriya
- C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University, Surat, India
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Zhumakayev AR, Vörös M, Szekeres A, Rakk D, Vágvölgyi C, Szűcs A, Kredics L, Škrbić BD, Hatvani L. Comprehensive characterization of stress tolerant bacteria with plant growth-promoting potential isolated from glyphosate-treated environment. World J Microbiol Biotechnol 2021; 37:94. [PMID: 33963474 DOI: 10.1007/s11274-021-03065-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 04/28/2021] [Indexed: 10/21/2022]
Abstract
The application of plant growth-promoting bacteria in agricultural systems is an efficient and environment-friendly strategy to improve crop yields and maintain soil quality. However, as different soils have diverse and specific ecological characteristics and may represent adverse abiotic conditions, in vivo application requires the careful selection of the desired beneficial microorganisms. In this study we report Ensifer adhaerens SZMC 25856 and Pseudomonas resinovorans SZMC 25875 isolates recovered from glyphosate-treated soil to possess yet undiscovered plant growth-enhancing potential. The strains were found to promote the growth of tomato seedlings significantly, to have the ability of synthesizing indole-3-acetic acid and siderophores, to tolerate pH in the range of 6.59-7.96, salinity up to 12.5 g L-1 NaCl and drought up to 125 g L-1 polyethylene glycol 6000, as well as to survive in the presence of various pesticides including glyphosate, diuron, chlorotoluron, carbendazim and thiabendazole, and heavy metals such as Al, Fe, Mn, Zn, Pb and Cu. The plant growth-promoting traits of the examined E. adhaerens and P. resinovorans isolates and their tolerance to numerous abiotic stress factors make them promising candidates for application in different agricultural environments, including soils polluted with glyphosate.
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Affiliation(s)
- Anuar R Zhumakayev
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary
- Doctoral School in Biology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary
| | - Mónika Vörös
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary
| | - András Szekeres
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary
| | - Dávid Rakk
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary
- Doctoral School in Biology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary
| | - Csaba Vágvölgyi
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary
| | - Attila Szűcs
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary
| | - László Kredics
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary
| | - Biljana D Škrbić
- Faculty of Technology Novi Sad, University of Novi Sad, Bulevar cara Lazara 1, 21000, Novi Sad, Serbia
| | - Lóránt Hatvani
- Department of Microbiology, Faculty of Science and Informatics, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary.
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Rhizospheric Phosphate Solubilizing Bacillus atrophaeus GQJK17 S8 Increases Quinoa Seedling, Withstands Heavy Metals, and Mitigates Salt Stress. SUSTAINABILITY 2021. [DOI: 10.3390/su13063307] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Introduction of quinoa (Chenopodium quinoa willd.), a gluten-free nutritious pseudo-cereal, outside its traditional growing areas exposed it to seedling damping-off. Here, we isolated eleven phosphate-solubilizing bacteria from the quinoa rhizosphere and assessed their effect on germination and seedlings growth. All isolates solubilized phosphate, produced indole3-acetic acid, hydrocyanic acid, siderophores, and ammonia. Genotypic analysis revealed that our strains are related to the genus of Bacillus, Pseudomonas, and Enterobacter. Strains Enterobacter asburiae (QD14, QE4, QE6, and QE16), Enterobacter sp. QE3, and Enterobacter hormaechei QE7 withstood 1.5 mg·L−1 of cadmium sulfate, 0.5 mg·mL−1 of nickel nitrate, and 1 mg·mL−1 of copper sulfate. Moreover, all strains solubilized zinc from ZnO; P. Stutzeri QD1 and E. asburiae QD14 did not solubilize Zn3(PO4)2 and CO3Zn, whereas CO3Zn was not solubilized by E. asburiae QE16. Bacillus atrophaeus S8 tolerated 11% NaCl. P. frederiksbergensis S6 and Pseudomonas sp. S7 induced biofilm formation. Anti-fusarium activity was demonstrated for E.asburiae QE16, P. stutzeri QD1, P. frederiksbergensis S6, Pseudomonas sp. S7, and B. atrophaeus S8. Lastly, inoculation of quinoa seeds with B. atrophaeus S8 and E. asburiae QB1 induced the best germination rate and seedling growth, suggesting their potential use as inoculants for salty and heavy metal or zinc contaminated soils.
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Identification of New Biocontrol Agent against Charcoal Rot Disease Caused by Macrophomina phaseolina in Soybean (Glycine max L.). SUSTAINABILITY 2020. [DOI: 10.3390/su12176856] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Controlling agricultural pests using suitable biocontrol agents has been considered the best strategy for sustainable agriculture. Charcoal rot caused by a necrotrophic fungus Macrophomina phaseolina is responsible for a 30–50% annual reduction in soybean yield worldwide. Little is known about the role of Bacillus clausii in reducing charcoal rot disease severity in the soybean crop. In this study, we investigated plant growth promoting and antagonistic potential of Pseudomonas putida (MT604992) and Bacillus clausii (MT604989) against charcoal rot disease incidence in soybean. Among twenty bacteria isolated from soil and water samples of two different hot springs of Gilgit-Baltistan, Pakistan, 80% were siderophore positive; 65% were hydrogen cyanide (HCN) positive; 55%, 30%, and 75% were phosphate, potassium, and zinc solubilizers, respectively. Based on higher antagonistic activities and plant growth promoting traits five strains were selected for in vitro screening. Out of all tested strains, Pseudomonas putida and Bacillus clausii showed a significant increase in germination, growth, and disease suppression in soybean. These strains produced a pronounced increase in relative water content, photosynthetic pigments, membrane stability, proline, antioxidant enzymes status, phytohormones content (Salicylic acid, and Jasmonic acid), and disease suppression in comparison to control plants. Bacillus clausii mitigated the disease by 97% with a marked increase in the proline content (73% and 89%), superoxide dismutase (356% and 208%), peroxidase (439% and 138.6%), catalase (255.8% and 80.8%), and ascorbate peroxidase (228% and 90%) activities in shoots and roots, respectively. Infected plants showed an increase in salicylic acid and jasmonic acid content which was further increased with the application of the selected strains to increase resistance against pathogens. To our knowledge, this is the first study showing a rise in salicylic acid and jasmonic acid in Macrophomina phaseolina infected plants. These two strains are suggested as a cost-effective, eco-friendly, and sustainable alternative to chemical fungicides. However, there is a need to explore the field testing and molecular mechanisms leading to disease suppression by these strains.
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Mahdi I, Fahsi N, Hafidi M, Allaoui A, Biskri L. Plant Growth Enhancement using Rhizospheric Halotolerant Phosphate Solubilizing Bacterium Bacillus licheniformis QA1 and Enterobacter asburiae QF11 Isolated from Chenopodium quinoa Willd. Microorganisms 2020; 8:E948. [PMID: 32599701 PMCID: PMC7356859 DOI: 10.3390/microorganisms8060948] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 06/16/2020] [Indexed: 12/14/2022] Open
Abstract
Plant growth-promoting rhizobacteria represent a promising solution to enhancing agricultural productivity. Here, we screened phosphate solubilizing bacteria from the rhizospheric soil of Chenopodium quinoa Willd and assessed their plant-growth promoting rhizobacteria (PGPR) properties including production of indole-3-acetic acid (IAA), siderophores, hydrogen cyanide (HCN), ammonia and extracellular enzymes. We also investigated their tolerance to salt stress and their capacity to form biofilms. Two isolated strains, named QA1 and QF11, solubilized phosphate up to 346 mg/L, produced IAA up to 795.31 µg/mL, and tolerated up to 2 M NaCl in vitro. 16S rRNA and Cpn60 gene sequencing revealed that QA1 and QF11 belong to the genus Bacillus licheniformis and Enterobacter asburiae, respectively. In vivo, early plant growth potential showed that quinoa seeds inoculated either with QA1 or QF11 displayed higher germination rates and increased seedling growth. Under saline irrigation conditions, QA1 enhanced plant development/growth. Inoculation with QA1 increased leaf chlorophyll content index, enhanced P and K+ uptake and decreased plant Na+ uptake. Likewise, plants inoculated with QF11 strain accumulated more K+ and had reduced Na+ content. Collectively, our findings support the use of QA1 and QF11 as potential biofertilizers.
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Affiliation(s)
- Ismail Mahdi
- Medical Application Interface Center (CIAM), Mohammed VI Polytechnic University (UM6P), 43150 Benguérir, Morocco; (I.M.); (N.F.)
- Laboratory of Microbial Biotechnologies, Agrosciences and Environment (BioMAgE), Faculty of Sciences Semlalia, Cadi Ayyad University, 40000 Marrakesh, Morocco;
| | - Nidal Fahsi
- Medical Application Interface Center (CIAM), Mohammed VI Polytechnic University (UM6P), 43150 Benguérir, Morocco; (I.M.); (N.F.)
- Laboratory of Genetic, Neuroendocrinology and Biotechnology, Faculty of Sciences, Ibn Tofail University, 14000 Kénitra, Morocco
| | - Mohamed Hafidi
- Laboratory of Microbial Biotechnologies, Agrosciences and Environment (BioMAgE), Faculty of Sciences Semlalia, Cadi Ayyad University, 40000 Marrakesh, Morocco;
- Microbiome Team and African genome center (AGC), AgrobioSciences department (AgBS), Mohammed VI Polytechnic University (UM6P), 43150 Benguérir, Morocco;
| | - Abdelmounaaim Allaoui
- Microbiome Team and African genome center (AGC), AgrobioSciences department (AgBS), Mohammed VI Polytechnic University (UM6P), 43150 Benguérir, Morocco;
- Laboratory of Molecular Microbiology, CIPEM (Coalition Center, for Innovation, and Prevention of Epidemies in Morocco) Mohammed VI Polytechnic University (UM6P), 43150 Benguérir, Morocco
| | - Latefa Biskri
- Medical Application Interface Center (CIAM), Mohammed VI Polytechnic University (UM6P), 43150 Benguérir, Morocco; (I.M.); (N.F.)
- Laboratory of Molecular Microbiology, CIPEM (Coalition Center, for Innovation, and Prevention of Epidemies in Morocco) Mohammed VI Polytechnic University (UM6P), 43150 Benguérir, Morocco
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Inside the plant: addressing bacterial endophytes in biotic stress alleviation. Arch Microbiol 2019; 201:415-429. [PMID: 30834947 DOI: 10.1007/s00203-019-01642-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 11/06/2018] [Accepted: 02/26/2019] [Indexed: 12/28/2022]
Abstract
Bacterial endophytes are the internal association of bacteria with the plants, cherished whole or any part of their life cycle inside the plant. They are reported to improve plant health against the biotic stresses via de novo synthesis of structural compounds and stimulation of plant immunity. They are found to be vital in development of host resistance against phytopathogens and capable in reducing and elimination of deleterious effects of plant pathogens. Fungal-, bacterial-, viral-, insect- and nematode-associated negative effect can be reduced by the bacterial endophytes. They are also reported to control plant pathogens through several defense mechanisms such as by producing antimicrobial compounds and antibiotics, de novo synthesis of structural compounds, keeping out of pathogens by niche competition and induction of plant immunity or induced systemic resistance. In this review, an effort is made to summarize the exploitation of endophytic bacteria as a biological substitute to control biotic stresses in agricultural practices.
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