Bacillus subtilis: A Multifarious Plant Growth Promoter, Biocontrol Agent, and Bioalleviator of Abiotic Stress

Sagar, Alka; Yadav, Sumit; Sayyed, R. Z.; Sharma, Seema; Ramteke, Pramod W.

doi:10.1007/978-3-030-85465-2_24

Cited by 31 publications

(18 citation statements)

References 106 publications

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“…These findings were in line with the fact that PGPR provide a range of benefits to the plants ( Baba et al, 2021 ), such as plant growth promotion through the production of phytohormones ( Kalam et al, 2020 ), nitrogen fixation ( Kusale et al, 2021a ), P solubilization ( Sharma et al, 2013 , 2016 ), ammonia production ( Kusale et al, 2021a ), and siderophore production ( Patel et al, 2016 ; Shaikh et al, 2016 ; Khan et al, 2019 ; Sayyed et al, 2019 ; Jabborova et al, 2020 ; Basu et al, 2021 ). They also produce various metabolites that protect the plant from oxidative damages exerted by salinity stress ( Sagar et al, 2019 , 2020a , 2020b , 2022a , 2022b ; Jabborova et al, 2020 ).…”

Section: Discussionmentioning

confidence: 99%

“…Production of ACCD by PGPR is the major mechanism of salinity stress tolerance ( Shrivastava and Kumar, 2013 ; Sagar et al, 2020a ). The enzyme ACCD lowers the level of ACC in root exudates; the suboptimal level of ACC reduces the concentration of ethylene in the plant roots and thus helps in root length, which improves the absorption of nutrients ( Kusale et al, 2021a ; Sagar et al, 2022b ). A wide range of ACCD-producing PGPR, including Klebsiella sp.…”

Section: Discussionmentioning

confidence: 99%

“…Plants grown in salinity stress conditions need more support toward these abiotic distresses. Therefore, halotolerant plant growth-promoting rhizobacteria (H-PGPR) isolates as microbiota in plant holobionts support plant growth in saline soil ( Setiawati et al, 2020 ; Sagar et al, 2022a , b ). H-PGPR isolates can live, survive, and engage around the root of plants creating a rhizosphere microbiome ( Larsen, 1986 ; Fitriatin et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

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Halotolerant Plant Growth-Promoting Rhizobacteria Isolated From Saline Soil Improve Nitrogen Fixation and Alleviate Salt Stress in Rice Plants

et al. 2022

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Salinity is one of the most damaging abiotic stresses due to climate change impacts that affect the growth and yield of crops, especially in lowland rice fields and coastal areas. This research aimed to isolate potential halotolerant plant growth-promoting rhizobacteria from different rhizo-microbiome and use them as effective bioinoculants to improve rice growth under salinity stress conditions. Bioassay using rice seedlings was performed in a randomized block design consisting of 16 treatments (control and 15 bacterial isolates) with three replications. Results revealed that isolates S3, S5, and S6 gave higher shoot height, root length, and plant dry weight compared with control (without isolates). Based on molecular characteristics, isolates S3 and S5 were identified as Pseudomonas stutzeri and Klebsiella pneumonia. These isolates were able to promote rice growth under salinity stress conditions as halotolerant plant growth-promoting rhizobacteria. These three potent isolates were found to produce indole-3-acetic acid and nitrogenase.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Halotolerant Plant Growth-Promoting Rhizobacteria Isolated From Saline Soil Improve Nitrogen Fixation and Alleviate Salt Stress in Rice Plants

et al. 2022

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“…Some of the pathogens that have been controlled by Azotobacter sp. in the soil and on the leaf ( Kalam et al, 2020 ; Sukmawati et al, 2021 ) and ease abiotic stress in plants ( Sagar et al, 2020a , 2022a , b ; Kusale et al, 2021a , b ). Azotobacter sp.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Azotobacter nigricans and Nitrogen Phosphorus Potassium Fertilizer on Agronomic and Yieldtraits of Maize (Zea mays L.)

Sagar¹,

Sayyed

Ramteke

et al. 2022

Front. Plant Sci.

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Plant growth-promoting bacteria (PGPB) Azotobacter spp. is the most promising bacteria among all microorganisms. It is an aerobic, free-living, and N2-fixing bacterium that commonly lives in soil, water, and sediments. It can be used as a biofertilizer for plant growth and nutrient utilization efficiency. Maize is the highly consumed cereal food crop of the cosmopolitan population, and the sustainable maize productivity achieved by applying bacteria in combination with nitrogen phosphorus potassium (NPK) is promising. In the present study, a bacterial isolate (PR19). Azotobacter nigricans, obtained from the soil of an organic farm was evaluated for its plant growth promoting potential alone and in combination with an inorganic fertilizer (NPK) included. The bacterial cultue (PR19) was screened for its morphological, biochemical, and plant growth-promoting characteristics, sequenced by the 16S rDNA method, and submitted to NCBI for the confirmation of strain identification. Further, the inoculation effect of the bacterial culture (PR19) in combination with NPK on growth and yield parameters of maize under pot were analyzed. Based on phenotypic and molecular characteristics, PR19 was identified as Azotobacter nigricans it was submitted to NCBI genbank under the accession No. KP966496. The bacterial isolate possessed multiple plant growth-promoting (MPGP) traits such as the production of ammonia, siderophore, indole-3-acetic acid (IAA), and ACC Deaminase (ACCD). It showed phosphate solubilization activity and tolerance to 20% salt, wide range of pH 5–9, higher levels of trace elements and heavy metals, and resistance to multiple antibiotics. PR19 expressed significantly increased (p < 0.001) antioxidant enzyme activities (SOD, CAT, and GSH) under the abiotic stress of salinity and pH. In vitro condition, inoculation of maize with the PR19 showed a significant increase in seed germination and enhancement in elongation of root and shoot compared to untreated control. The combined application of the PR19 and NPK treatments showed similar significant results in all growth and yield parameters of maize variety SHIATS-M S2. This study is the first report on the beneficial effects of organic farm isolated PR19-NPK treatment combinations on sustainable maize productivity.

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“…Plant growth-promoting rhizobacteria increase the use of phosphate solubilization ( Sharma et al, 2016 ), improve nutrient availability in plants ( Hamid et al, 2021 ; Sarkar et al, 2021 ), and biosynthesize metal chelators ( Nithyapriya et al, 2021 ). Most PGPR have been used to control phytopathogens ( Khan et al, 2021 ; Sukmawati et al, 2021 ) and ease abiotic stress in plants ( Kashyap et al, 2017 , 2021 ; Olanrewaju et al, 2017 ; Zhao et al, 2019 ; Sagar et al, 2020 , 2022a , b ; Kusale et al, 2021a , b ). Actinobacteria, such as Streptomyces spp., have been used to manage phytopathogens through biological control ( Katarzyna et al, 2018 ; Kalam et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Unraveling the tripartite interaction of volatile compounds of Streptomyces rochei with grain mold pathogens infecting sorghum

et al. 2022

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Sorghum is a major grain crop used in traditional meals and health drinks, and as an efficient fuel. However, its productivity, value, germination, and usability are affected by grain mold, which is a severe problem in sorghum production systems, which reduces the yield of harvested grains for consumer use. The organic approach to the management of the disease is essential and will increase consumer demand. Bioactive molecules like mVOC (volatile organic compound) identification are used to unravel the molecules responsible for antifungal activity. The Streptomyces rochei strain (ASH) has been reported to be a potential antagonist to many pathogens, with high levels of VOCs. The present study aimed to study the inhibitory effect of S. rochei on sorghum grain mold pathogens using a dual culture technique and via the production of microbial volatile organic compounds (mVOCs). mVOCs inhibited the mycelial growth of Fusarium moniliforme by 63.75 and Curvularia lunata by 68.52%. mVOCs suppressed mycelial growth and inhibited the production of spores by altering the structure of mycelia in tripartite plate assay. About 45 mVOCs were profiled when Streptomyces rochei interacted with these two pathogens. In the present study, several compounds were upregulated or downregulated by S. rochei, including 2-methyl-1-butanol, methanoazulene, and cedrene. S. rochei emitted novel terpenoid compounds with peak areas, such as myrcene (1.14%), cymene (6.41%), and ç-terpinene (7.32%) upon interaction with F. moniliforme and C. lunata. The peak area of some of the compounds, including furan 2-methyl (0.70%), benzene (1.84%), 1-butanol, 2-methyl-(8.25%), and myrcene (1.12)%, was increased during tripartite interaction with F. moniliforme and C. lunata, which resulted in furan 2-methyl (6.60%), benzene (4.43%), butanol, 2-methyl (18.67%), and myrcene (1.14%). These metabolites were implicated in the sesquiterpenoid and alkane biosynthetic pathways and the oxalic acid degradation pathway. The present study shows how S. rochei exhibits hyperparasitism, competition, and antibiosis via mVOCs. In addition to their antimicrobial functions, these metabolites could also enhance plant growth.

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Bacillus subtilis: A Multifarious Plant Growth Promoter, Biocontrol Agent, and Bioalleviator of Abiotic Stress

Cited by 31 publications

References 106 publications

Halotolerant Plant Growth-Promoting Rhizobacteria Isolated From Saline Soil Improve Nitrogen Fixation and Alleviate Salt Stress in Rice Plants

Halotolerant Plant Growth-Promoting Rhizobacteria Isolated From Saline Soil Improve Nitrogen Fixation and Alleviate Salt Stress in Rice Plants

Synergistic Effect of Azotobacter nigricans and Nitrogen Phosphorus Potassium Fertilizer on Agronomic and Yieldtraits of Maize (Zea mays L.)

Unraveling the tripartite interaction of volatile compounds of Streptomyces rochei with grain mold pathogens infecting sorghum

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