Potential of plant growth-promoting rhizobacteria-plant interactions in mitigating salt stress for sustainable agriculture: A review

Kumawat, Kailash Chand; Nagpal, Sharon; Sharma, Poonam

doi:10.1016/s1002-0160(21)60070-x

Cited by 72 publications

(45 citation statements)

References 257 publications

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“…It is a phenomenon of soil degradation caused by the enrichment of salt ions in the soil due to a combination of natural factors and human activities ( Abbas et al, 2019 ). Low rainfall, high evaporation, native rocks, saline irrigation water, and poor water management are increasingly causing salinization problems in agricultural areas ( Singh, 2021 ; Kumawat et al, 2022 ). In saline areas, the natural growth and development as well as the physiological metabolism of plants are severely disturbed by saline stress ( Liu et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

“…Soil leaching requires relatively low soil moisture and a low water table, making this a difficult approach for agro-ecosystems, and important nutrients in the soil are lost during the leaching process ( Kumar Arora et al, 2020 ). Traditional genetic breeding and plant genetic engineering to produce salt-tolerant crops are widely considered to be effective strategies, but these methods usually require a lengthy selection and validation process ( Kumawat et al, 2022 ). Moreover, it is still uncertain whether transgenic crops will be universally accepted ( Qin et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

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The Endophytic Strain ZS-3 Enhances Salt Tolerance in Arabidopsis thaliana by Regulating Photosynthesis, Osmotic Stress, and Ion Homeostasis and Inducing Systemic Tolerance

Shi

et al. 2022

Front. Plant Sci.

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Soil salinity is one of the main factors limiting agricultural development worldwide and has an adverse effect on plant growth and yield. To date, plant growth-promoting rhizobacteria (PGPR) are considered to be one of the most promising eco-friendly strategies for improving saline soils. The bacterium Bacillus megaterium ZS-3 is an excellent PGPR strain that induces growth promotion as well as biotic stress resistance and tolerance to abiotic stress in a broad range of host plants. In this study, the potential mechanisms of protection against salinity stress by B. megaterium ZS-3 in Arabidopsis thaliana were explored. Regulation by ZS-3 improved growth in A. thaliana under severe saline conditions. The results showed that ZS-3 treatment significantly increased the biomass, chlorophyll content and carotenoid content of A. thaliana. Compared to the control, the leaf area and total fresh weight of plants inoculated with ZS-3 increased by 245% and 271%, respectively; the chlorophyll a, chlorophyll b, and carotenoid contents increased by 335%, 146%, and 372%, respectively, under salt stress. Physiological and biochemical tests showed that ZS-3 regulated the content of osmotic substances in plants under salt stress. Compared to the control, the soluble sugar content of the ZS-3-treated group was significantly increased by 288%, while the proline content was significantly reduced by 41.43%. Quantification of Na+ and K+ contents showed that ZS-3 treatment significantly reduced Na+ accumulation and increased the K+/Na+ ratio in plants. ZS-3 also isolated Na+ in vesicles by upregulating NHX1 and AVP1 expression while limiting Na+ uptake by downregulating HKT1, which protected against Na+ toxicity. Higher levels of peroxidase and catalase activity and reduced glutathione were detected in plants inoculated with ZS-3 compared to those in uninoculated plants. In addition, it was revealed that ZS-3 activates salicylic acid (NPR1 and PR1) and jasmonic acid/ethylene (AOS, LOX2, PDF1.2, and ERF1) signaling pathways to induce systemic tolerance, thereby inducing salt tolerance in plants. In conclusion, the results of this study indicate that ZS-3 has the potential to act as an environmentally friendly salt tolerance inducer that can promote plant growth in salt-stressed environments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Endophytic Strain ZS-3 Enhances Salt Tolerance in Arabidopsis thaliana by Regulating Photosynthesis, Osmotic Stress, and Ion Homeostasis and Inducing Systemic Tolerance

Shi

et al. 2022

Front. Plant Sci.

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“…Therefore, we also observed that the inoculated plants showed a significant increase in biomass. Proline, a plant intracellular substance, which played a role in water conservation and improved the ability of plants to resist salt stress ( Kumawat et al, 2022 ). In our study, we also observed that the proline content of plant leaves increased significantly under salt stress after inoculating strains BG-5, the plant showed a strong salt tolerance after inoculating strain BG-5.…”

Section: Discussionmentioning

confidence: 99%

Soil Microbes Drive the Flourishing Growth of Plants From Leucocalocybe mongolica Fairy Ring

Wang

Wang²,

Wei

et al. 2022

Front. Microbiol.

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Fairy ring is a natural phenomenon in which fungal fruiting bodies occur as a ring on a spot. This ring is produced due to spore ejection by Basidiomycetous fungi and forms a lush growing plant belt. However, the drivers for such formations and the potential plant growth-promoting rhizobacteria in fairy ring soils remain unknown. Fairy rings formed by Leucocalocybe mongolica were selected in this study. Soil characteristics and microbial (bacteria and fungi) community structures between beneath and outside the fairy rings were compared through high-throughput sequencing. Beneficial bacterial resources were excavated using dependent culturable methods. Soil electrical conductivity and available potassium were higher in the soil beneath the ring than outside it. These parameters were positively correlated with the dominant microbial community, but microbial diversity was lower. In the soil beneath the fairy ring, Bacteroidetes and Basidiomycota were more abundant, whereas Verrucomicrobia was less prevalent. Bacillus pumilus (strain BG-5) was isolated from the soil beneath the ring. Strain BG-5 can solubilize phosphorus and produce indole-3-acetic acid, NH4+, and siderophores. Furthermore, strain BG-5 enhanced salt tolerance and promoted the growth of Arabidopsis thaliana, wheat (Triticum aestivum), and cotton (Gossypium hirsutum) seedlings. This study indicated the presence of abundant beneficial microbes driving the flourishing growth of plants in the fairy ring soil and provided bio-resources for agricultural growth-promoting agents.

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“…Increased synthesis of photosynthetic pigments occurred as a result of microbial inoculation. Plants with more chlorophyll have a higher photosynthetic rate, which transforms more carbon dioxide and water into glucose, increases metabolic activity and subsequently improves plant development (Kumawat et al 2022). Achromobacter sp.…”

Section: Discussionmentioning

confidence: 99%

Application of Soil Bacteria as Bioinoculants to Promote Growth of Cowpea (Vigna unguiculata)

et al. 2022

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This work aimed to evaluate the capacity of soil bacteria as bioinoculants (biofertilizers) to promote cowpea (Vigna unguiculata) growth. Three pure bacterial cultures namely Acinetobacter pittii PT1.3.4 (AP), Achromobacter sp.C2.23 (AS), and Achromobacter xylosoxidans N3.4 (AX) were used as bioinoculants to enhance germination and development of cowpea seeds. Pre-decide formulations of single or mixed cultures were prepared, soaked with cowpea seeds, and cultivated on agar in a growth chamber for 7 days at 25°C. Shoot and root length were measured and percentage germination was determined. Similarly, bacterial formulations were prepared in talcum powder and were used as bioinoculants to adhere to cowpea seeds. The inoculated seeds were cultivated in pots for 28 days for the shoot and root length, fresh and dry weight, and percentage germination. Among the tested various formulations, treatment has A. pittii (AP) displayed the highest shoot length (14.67 cm) and fresh weight (0.58 g/plant) of cowpea under laboratory conditions after seven days of inoculation. Similarly, cowpea plants treated with A. pittii (AP) also have the tallest shoots (14.25 cm) under natural conditions after 7 days of inoculation, while the highest root length (10.5 cm) and fresh weight (1.57 g/plant) were recorded from the treatment of Achromobacter sp. (AS). Further, the results of the study also revealed that soil bacteria can survive for one month in talcum powder at 4°C and room temperature storage. These bioinoculants can be used for agricultural application by local farmers to mitigate the cost of chemicals that cause environmental concerns to promote sustainable agriculture in Thailand.

show abstract

Potential of plant growth-promoting rhizobacteria-plant interactions in mitigating salt stress for sustainable agriculture: A review

Cited by 72 publications

References 257 publications

The Endophytic Strain ZS-3 Enhances Salt Tolerance in Arabidopsis thaliana by Regulating Photosynthesis, Osmotic Stress, and Ion Homeostasis and Inducing Systemic Tolerance

The Endophytic Strain ZS-3 Enhances Salt Tolerance in Arabidopsis thaliana by Regulating Photosynthesis, Osmotic Stress, and Ion Homeostasis and Inducing Systemic Tolerance

Soil Microbes Drive the Flourishing Growth of Plants From Leucocalocybe mongolica Fairy Ring

Application of Soil Bacteria as Bioinoculants to Promote Growth of Cowpea (Vigna unguiculata)

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