Role of Secondary Metabolites from Plant Growth-Promoting Rhizobacteria in Combating Salinity Stress

Mishra, Jitendra; Fatima, Tahmish; Arora, Naveen Kumar

doi:10.1007/978-981-10-5514-0_6

Cited by 56 publications

(36 citation statements)

References 253 publications

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“…Plants accumulate organic osmolytes such as proline, glycine, betaine, polyamines, quaternary ammonium compounds, and other amino acids in response to various abiotic stresses (Sandhya et al, 2010). ST-PGPR also employ this mechanism for protection against osmotic stress which is more common in saline soils (Mishra et al, 2018). While exposed to salt stress, salt-tolerant bacteria may temporarily increase their cytoplasmic content of K + , but the accumulation of osmolytes is a more sustained stress response to prevent water loss (Bremer and Kramer, 2019).…”

Section: Osmoprotectantsmentioning

confidence: 99%

“…They also addressed that use of indigenous ST-PGPR strains should be preferred in bioinoculant development as they can easily adapt to the local field conditions. Similarly, development of ST-PGPR based bioinoculant exclusively designed for saline soils could be more efficient approach in managing productivity loss in several crops (Mishra et al, 2018). Whereas prospects on future research of developing novel bioinoculants providing metabolites (osmolytes, biosurfactants, precursor of phytohormones and stress enzymes) along with efficient ST-PGPR strains (including consortia) should also be explored.…”

Section: Future Prospectsmentioning

confidence: 99%

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Salt-Tolerant Plant Growth Promoting Rhizobacteria for Enhancing Crop Productivity of Saline Soils

et al. 2019

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Soil salinity has emerged as a serious issue for global food security. It is estimated that currently about 62 million hectares or 20 percent of the world's irrigated land is affected by salinity. The deposition of an excess amount of soluble salt in cultivable land directly affects crop yields. The uptake of high amount of salt inhibits diverse physiological and metabolic processes of plants even impacting their survival. The conventional methods of reclamation of saline soil which involve scraping, flushing, leaching or adding an amendment (e.g., gypsum, CaCl 2 , etc.) are of limited success and also adversely affect the agro-ecosystems. In this context, developing sustainable methods which increase the productivity of saline soil without harming the environment are necessary. Since long, breeding of salt-tolerant plants and development of salt-resistant crop varieties have also been tried, but these and aforesaid conventional approaches are not able to solve the problem. Salt tolerance and dependence are the characteristics of some microbes. Salt-tolerant microbes can survive in osmotic and ionic stress. Various genera of salt-tolerant plant growth promoting rhizobacteria (ST-PGPR) have been isolated from extreme alkaline, saline, and sodic soils. Many of them are also known to mitigate various biotic and abiotic stresses in plants. In the last few years, potential PGPR enhancing the productivity of plants facing salt-stress have been researched upon suggesting that ST-PGPR can be exploited for the reclamation of saline agro-ecosystems. In this review, ST-PGPR and their potential in enhancing the productivity of saline agro-ecosystems will be discussed. Apart from this, PGPR mediated mechanisms of salt tolerance in different crop plants and future research trends of using ST-PGPR for reclamation of saline soils will also be highlighted.

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Section: Osmoprotectantsmentioning

confidence: 99%

Section: Future Prospectsmentioning

confidence: 99%

Salt-Tolerant Plant Growth Promoting Rhizobacteria for Enhancing Crop Productivity of Saline Soils

et al. 2019

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“…Iron sequestration, plant hormone production, nitrogen fixation and phosphate solubilization are direct mechanisms for plant growth enhancement. Examples of the indirect mechanisms are antibiosis against microbial phytopathogens and improvement of abiotic stresses such as salt stress (Shameer and Prasad, 2018;Mishra, et al,2018) An important mechanism of PGPR-mediated plant growth enhancement is the production of 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase, which deaminases ACC, a precursor of ethylene in plants, and thereby reduces the ethylene content. Different bacterial groups inhabiting rhizospheric soil commonly consume ACC as the sole source of nitrogen.…”

Section: Introductionmentioning

confidence: 99%

“…Different bacterial groups inhabiting rhizospheric soil commonly consume ACC as the sole source of nitrogen. Arthrobacter, Bacillus, Burkholderia phytofirmans, Pseudomonas fluorescens, Pseudomonas putida, Klebsiella, Serratia, Enterobacter and Microbacterium are examples of ACC deaminase-containing bacterial species that have been reported to promote growth of different plants species (e.g., Brassica napus (canola), Oryza sativa (rice), and Triticum aestivum (wheat) (Sarkar et al, 2018, Zhang et al, 2018, Shameer and Prasad, 2018Mishra, et al, 2018). Salinity is an important obstacle limiting agricultural production and expansion of cultivated areas, which affects most areas of Saudi Arabia and other arid regions.…”

Section: Introductionmentioning

confidence: 99%

ACC Deaminase-Containing Rhizobacteria from Rhizosphere of Zygophyllum coccineum Alleviate Salt Stress Impact on Wheat (Triticum aestivum L.)

Khalifa¹

2020

SJKFU

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Plant growth-promoting bacteria are present in the rhizosphere, a soil zone around plant roots. An important mechanism of plant growth enhancement is the production of 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase. Three ACC deaminase-producing bacterial strains were isolated from the rhizosphere of the halophytic plant Zygophyllum coccineum growing in Al-Uqair, Al-Ahsa, Saudi Arabia. The strains were identified as Bacillus filamentosus, Janibacter indicus, and Brevibacterium casei based on 16S rRNA sequence, and their taxonomic position was determined. Furthermore, the strains exhibited catalase and indoleacetic acid production and phosphate solubilization. The highest ACC deaminase activity was observed in B. filamentosus (~ 449 nmole α-ketobutyrate mg-1 h-1), followed by J. indicus and B. casei (~ 66 nmole α-ketobutyrate mg-1 h-1). Inoculation of wheat grains with each strain significantly enhanced growth. Z. coccineum rhizosphere harbors growth-promoting bacteria and ameliorated the negative effects of salt stress on wheat plants and may be used as an eco-friendly biofertilizer.

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“…Biofertilizers contain living cells of PGPR that increase plant growth directly through N2-fixation, production of phytohormones, lowering of ethylene concentration and solubilization of inorganic Phosphate (Ahmad & Kibert, 2014;Mishra et al, 2018). These bacteria secrete an organic acid like gluconic acid which solubilize the phosphate complexes converting them into ortho-phosphate which is available for plant uptake and utilization (Otieno et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Role of PGPR in the reclamation and revegetation of saline land

Ullah¹,

Bano²

2018

PAK.J.BOT.

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A field experiment was conducted to investigate the effect of PGPR inoculation on growth and yield of maize as well as on reclamation of saline sodic soil of Soil Salinity Research Institute Pindi Bhattian Pakistan, during 2015-16. Seed of maize genotype "Islamabad Gold" were soaked (2-3 h) prior to sowing in the broth culture of 4 bacterial strains i.e. Pseudomonas putida (accession no. KX580766), Pseudomonas fluorescens (accession no. KX644132), Exiguobacterium aurantiacum (accession no. KX580769), Bacillus pumilus (accession no. KX580768) and Lysinibacillus sphaericus (accession no. KX580767). In vitro analysis of bacteria confirmed that they metabolize ACC deaminase, solubilize insoluble phosphate and produce significant quantity of auxin in the presence of L-tryptophan. Inoculation of maize with bacteria along with application of 1L inocula / treatment in the field gave a significant (P = 0.05) increase in germination (76%), leaf chlorophyll (24%), proline (65%), anthocyanin (38%) and soluble sugar content (56%). P. putida inoculation resulted in maximum increase in plant height, leaf area, no of grains cob -1 (459.8), 1000 grain weight (330.9 g) and grain yield (3.25 tha -1 ). P. fluorescens was least effective. The rhizosphere soil analysed after harvesting exhibited significant decrease in electrical conductivity (49%), sodium absorption ratio (98%), and cation exchange capacity (94%) concomitant with a significant increase in organic matter (52%), NO3-N (37%), available P (48%) and K (31%). The highest efficiency of P. putida may be attributed to the maximum ACC deaminase activity, higher production of indole acetic acid and greater potential for Phosphate solubilization. The favorable effects of PGPR were more pronounced in the successive year 2016.

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Role of Secondary Metabolites from Plant Growth-Promoting Rhizobacteria in Combating Salinity Stress

Cited by 56 publications

References 253 publications

Salt-Tolerant Plant Growth Promoting Rhizobacteria for Enhancing Crop Productivity of Saline Soils

Salt-Tolerant Plant Growth Promoting Rhizobacteria for Enhancing Crop Productivity of Saline Soils

ACC Deaminase-Containing Rhizobacteria from Rhizosphere of Zygophyllum coccineum Alleviate Salt Stress Impact on Wheat (Triticum aestivum L.)

Role of PGPR in the reclamation and revegetation of saline land

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