Bacterial endophyte mediated plant tolerance to salinity: growth responses and mechanisms of action

Kushwaha, Prity; Kashyap, Prem Lal; Bhardwaj, Ajay Kumar; Pandiyan, Kurinji; Srivastava, Alok Kumar; Tiwari, Rajesh Kumar

doi:10.1007/s11274-020-2804-9

Cited by 71 publications

(50 citation statements)

References 142 publications

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“…The association between PGPR and plants has long been established. Recent reviews have also revealed some possible mechanisms of PGPR for salinity tolerance by acting as endophytes and serving the plant host with the plant growth-promoting characteristics, along with improving osmolytes, anti-oxidant, and phytohormonal signalling and enhancing plant nutrient uptake efficiency [19,20]. However, there are still other mechanisms to explore as not all PGPR can enter the plant host as endophytes.…”

Section: Introductionmentioning

confidence: 99%

Characterization of salt-tolerant plant growth-promoting rhizobacteria and the effect on growth and yield of saline-affected rice

et al. 2020

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In this study, we characterized, identified, and determined the effect of salt-tolerant PGPR isolated from coastal saline areas on rice growth and yield. A total of 44 bacterial strains were isolated, and 5 were found to be tolerant at high salt concentration. These isolates were further characterized for salinity tolerance and beneficial traits through a series of quantitative tests. Biochemical characterization showed that bacterial survivability decreases gradually with the increase of salt concentration. One of the strains, UPMRB9, produced the highest amount of exopolysaccharides when exposed to 1.5M of NaCl. Moreover, UPMRB9 absorbed the highest amount of sodium from the 1.5M of NaCl-amended media. The highest floc yield and biofilm were produced by UPMRE6 and UPMRB9 respectively, at 1M of NaCl concentration. The SEM observation confirmed the EPS production of UPMRB9 and UPMRE6 at 1.5M of NaCl concentration. These two isolates were identified as Bacillus tequilensis and Bacillus aryabhattai based on the 16S rRNA gene sequence. The functional group characterization of EPS showed the presence of hydroxyl, carboxyl, and amino groups. This corresponded to the presence of carbohydrates and proteins in the EPS and glucose was identified as the major type of carbohydrate. The functional groups of EPS can help to bind and chelate Na + in the soil and thereby reduces the plant's exposure to the ion under saline conditions. The plant inoculation study revealed significant beneficial effects of bacterial inoculation on photosynthesis, transpiration, and stomatal conductance of the plant which leads to a higher yield. The Bacillus tequilensis and Bacillus aryabhattai strains showed good potential as PGPR for salinity mitigation practice for coastal rice cultivation.

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Section: Introductionmentioning

confidence: 99%

Characterization of salt-tolerant plant growth-promoting rhizobacteria and the effect on growth and yield of saline-affected rice

et al. 2020

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“…Endophytes' population in a specific environment or within a single plant may differ with tissue type, plant growth stage and dimension of the ecological niches. Several studies comparing rhizosphere and endophytic microbial communities showed how species assemblages are significantly different but also that endophytic bacteria and their communities have some peculiar, commune, traits (Kushwaha et al, 2020).…”

Section: Bacterial and Fungal Communities Associated With Roots And Rmentioning

confidence: 99%

“…Recent studies illustrated some main mechanisms that emerged as capable of supporting directly or indirectly plant growth under saline stress (Kushwaha et al, 2020). Plants' strategy to survive under salinity conditions comprises the synthesis and accumulation of osmolytes, as free amino acids (i.e.…”

Section: Bacterial and Fungal Communities Associated With Roots And Rmentioning

confidence: 99%

“…Plants' strategy to survive under salinity conditions comprises the synthesis and accumulation of osmolytes, as free amino acids (i.e. proline) and sugars to sustain an adequate osmotic cellular pressure needed for the functioning of cellular metabolism (Kushwaha et al, 2020). Endophytes in plants living in saline soils proved to help them accumulating osmolytes and antioxidant compounds (Vaishnav et al, 2019).…”

Section: Bacterial and Fungal Communities Associated With Roots And Rmentioning

confidence: 99%

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When Salt Meddles Between Plant, Soil, and Microorganisms

Migliore²,

et al. 2020

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“…The understanding of the microbial diversity and function in complex plant–soil environments has increased significantly as a consequence of the application of next-generation sequencing (NGS) methods [ 31 , 32 ]. It is well recognized that every plant species possesses its own endo-microbiome that works commensally or beneficially for the host [ 33 , 34 , 35 ]. Endophytic bacteria serve as rich sources of phytohormones and diverse secondary metabolites with a wide spectrum of biological activities [ 24 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ].…”

Section: Introductionmentioning

confidence: 99%

Bacterial Endophytes of Spring Wheat Grains and the Potential to Acquire Fe, Cu, and Zn under Their Low Soil Bioavailability

Makar

Kuźniar

Patsula

et al. 2021

Biology

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Wheat grains are usually low in essential micronutrients. In resolving the problem of grain micronutritional quality, microbe-based technologies, including bacterial endophytes, seem to be promising. Thus, we aimed to (1) isolate and identify grain endophytic bacteria from selected spring wheat varieties (bread Oksamyt myronivs’kyi, Struna myronivs’ka, Dubravka, and emmer Holikovs’ka), which were all grown in field conditions with low bioavailability of microelements, and (2) evaluate the relationship between endophytes’ abilities to synthesize auxins and the concentration of Fe, Zn, and Cu in grains. The calculated biological accumulation factor (BAF) allowed for comparing the varietal ability to uptake and transport micronutrients to the grains. For the first time, bacterial endophytes were isolated from grains of emmer wheat T. turgidum subsp. dicoccum. Generally, the 12 different isolates identified in the four varieties belonged to the genera Staphylococcus, Pantoea, Sphingobium, Bacillus, Kosakonia, and Micrococcus (NCBI accession numbers: MT302194—MT302204, MT312840). All the studied strains were able to synthesize the indole-related compounds (IRCs; max: 16.57 µg∙mL−1) detected using the Salkowski reagent. The IRCs produced by the bacterial genera Pantoea spp. and Bacillus spp. isolated from high-yielding Oksamyt myronivs’kyi and Holikovs’ka grains may be considered as one of the determinants of the yield of wheat and its nutritional characteristics.

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Bacterial endophyte mediated plant tolerance to salinity: growth responses and mechanisms of action

Cited by 71 publications

References 142 publications

Characterization of salt-tolerant plant growth-promoting rhizobacteria and the effect on growth and yield of saline-affected rice

Characterization of salt-tolerant plant growth-promoting rhizobacteria and the effect on growth and yield of saline-affected rice

When Salt Meddles Between Plant, Soil, and Microorganisms

Bacterial Endophytes of Spring Wheat Grains and the Potential to Acquire Fe, Cu, and Zn under Their Low Soil Bioavailability

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