Halo-tolerant plant growth promoting rhizobacteria for improving productivity and remediation of saline soils

Arora, Naveen Kumar; Fatima, Tahmish; Mishra, Jitendra; Mishra, Isha; Verma, Sushma; Verma, Rishendra; Verma, Manisha; Bhattacharya, Ankita; Verma, Priyanka; Mishra, Priya; Bharti, Chanda

doi:10.1016/j.jare.2020.07.003

Cited by 186 publications

(89 citation statements)

References 151 publications

(158 reference statements)

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“…Of course, the composition of the EPSs excreted by the PGPB cells differs among genera and species and change with time, environmental conditions, and circumstances. There are data that EPSs improve nutrient uptake and water potential in the rhizosphere [138,139]. PGPB gently adhere to plant roots, secreting EPSs and forming biofilms against desiccation [137].…”

Section: Extracellular Polymeric Substances (Epss)mentioning

confidence: 99%

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Plant-Growth-Promoting Bacteria Mitigating Soil Salinity Stress in Plants

Shilev

2020

Applied Sciences

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Soil deterioration has led to problems with the nutrition of the world’s population. As one of the most serious stressors, soil salinization has a negative effect on the quantity and quality of agricultural production, drawing attention to the need for environmentally friendly technologies to overcome the adverse effects. The use of plant-growth-promoting bacteria (PGPB) can be a key factor in reducing salinity stress in plants as they are already introduced in practice. Plants having halotolerant PGPB in their root surroundings improve in diverse morphological, physiological, and biochemical aspects due to their multiple plant-growth-promoting traits. These beneficial effects are related to the excretion of bacterial phytohormones and modulation of their expression, improvement of the availability of soil nutrients, and the release of organic compounds that modify plant rhizosphere and function as signaling molecules, thus contributing to the plant’s salinity tolerance. This review aims to elucidate mechanisms by which PGPB are able to increase plant tolerance under soil salinity.

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Section: Extracellular Polymeric Substances (Epss)mentioning

confidence: 99%

“…Many of the EPS-producing PGPB play a vital role in soil fertility and agricultural sustainability, such as Azotobacter vinelandii, Rhizobium sp., Enterobacter sp., Agrobacterium sp., Xanthomonas sp., and Bacillus sp. ; thus, they indirectly improve soil structure and aggregation in the rhizosphere [55,138].…”

Section: Extracellular Polymeric Substances (Epss)mentioning

confidence: 99%

Plant-Growth-Promoting Bacteria Mitigating Soil Salinity Stress in Plants

Shilev

2020

Applied Sciences

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“…Disadvantages regarding the utilization of bacteria are connected with properties of the inoculated PGPRs and chiefly depend on their survival in soil, their interaction within indigenous soil microflora, and other complex environmental factors (Martinez-Viveros et al, 2010). Moreover, the modes of action of PGPRs are incredibly varied, and not all rhizobacteria have the same effects with identical mechanisms (Choudhary, 2012;Arora et al, 2020). Little is known about PGPFs compared to bacteria regarding their effectiveness in the plant growthpromoting processes.…”

Section: The Interplay Between Halophytes and Their Microbiome: A Glimentioning

confidence: 99%

When Salt Meddles Between Plant, Soil, and Microorganisms

Migliore²,

et al. 2020

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“…Halotolerant plant growth promoting rhizobacteria are now well known for their capability to tolerate and mitigate salinity stress in plants. Several species of HT-PGPR such as Arhrobacter, Azospirillum, Alcaligenes, Bacillus, Burkholderia, Enterobacter, Microbacterium, Klebsiella, Pseudomonas, Streptomyces, Rhizobium and Pantoea have been reported to alleviate salt stress in crops (Abbas et al, 2019;Arora et al, 2020). In a study by Nadeem et al (2013), inoculation of wheat by HT-PGPR Pseudomonas putida, Enterobacter cloacae, Serratia ficaria, and Pseudomonas fluorescens sown in naturally saline fields (ECe = 15 dS m −1 ) significantly enhanced germination percentage, germination rate and index of wheat seeds by 43, 51, and 123%, respectively, as compared to untreated control.…”

Section: Ht-pgpr: Diversity and Their Impact On Crop Improvementmentioning

confidence: 99%

“…Halotolerant plant growth promoting rhizobacteria are one of the pre-eminent group of microbes that can be utilized in the engineering of the rhizosphere in saline soils to replenish their fertility and increasing crop yield (Stringlis et al, 2018;Arora et al, 2020). It has been established that secondary metabolites produced by HT-PGPR can be very useful to develop novel bioinoculants for the cultivation of crops in saline soil (Arora, 2019).…”

Section: Futurementioning

confidence: 99%

Secondary Metabolites From Halotolerant Plant Growth Promoting Rhizobacteria for Ameliorating Salinity Stress in Plants

et al. 2020

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Soil salinization has emerged as one of the prime environmental constraints endangering soil quality and agricultural productivity. Anthropogenic activities coupled with rapid pace of climate change are the key drivers of soil salinity resulting in degradation of agricultural lands. Increasing levels of salt not only impair structure of soil and its microbial activity but also restrict plant growth by causing harmful imbalance and metabolic disorders. Potential of secondary metabolites synthesized by halotolerant plant growth promoting rhizobacteria (HT-PGPR) in the management of salinity stress in crops is gaining importance. A wide array of secondary metabolites such as osmoprotectants/compatible solutes, exopolysaccharides (EPS) and volatile organic compounds (VOCs) from HT-PGPR have been reported to play crucial roles in ameliorating salinity stress in plants and their symbiotic partners. In addition, HT-PGPR and their metabolites also help in prompt buffering of the salt stress and act as biological engineers enhancing the quality and productivity of saline soils. The review documents prominent secondary metabolites from HT-PGPR and their role in modulating responses of plants to salinity stress. The review also highlights the mechanisms involved in the production of secondary metabolites by HT-PGPR in saline conditions. Utilizing the HT-PGPR and their secondary metabolites for the development of novel bioinoculants for the management of saline agro-ecosystems can be an important strategy in the future.

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Halo-tolerant plant growth promoting rhizobacteria for improving productivity and remediation of saline soils

Abstract: Graphical abstract

Cited by 186 publications

References 151 publications

Plant-Growth-Promoting Bacteria Mitigating Soil Salinity Stress in Plants

Plant-Growth-Promoting Bacteria Mitigating Soil Salinity Stress in Plants

When Salt Meddles Between Plant, Soil, and Microorganisms

Secondary Metabolites From Halotolerant Plant Growth Promoting Rhizobacteria for Ameliorating Salinity Stress in Plants

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