Use of plant growth promoting rhizobacteria (PGPRs) with multiple plant growth promoting traits in stress agriculture: Action mechanisms and future prospects.
By H. Etesami, D. K. Maheshwari. Ecotoxicology and Environmental Safety, 2018
697 citations recorded by the source corpus.
Increased incidence of abiotic stresses impacting adversely plant growth and productivity in major crops is being witnessed all over the world. Therefore, as a result of such stress factors, plant growth under the stress conditions will be less than the non-stress conditions. Growing concerns and global demand for correct, environmentally-friendly techniques exist to reduce the adverse effects of plant stress. Under such stressful conditions, the role of interactions of plant and beneficial microorganisms is of great significance. Application of plant growth promoting rhizobacteria (PGPRs) is a useful option to decrease these stresses and is now widely in practice. Plants inoculated with PGPRs induce morphological and biochemical modifications resulting in increased tolerance to abiotic stresses defined as IST (induced systemic tolerance). PGPRs increase plant growth and resistance to abiotic stresses through various mechanisms (more than one mechanism of action) such as production of ACC (1-aminocyclopropane-1-carboxylate) deaminase, reducing production of stress ethylene, modifications in phytohormonal content, induction of synthezing plant antioxidative enzymes, improvement in the uptake of essential mineral elements, extracellular polymeric substance (EPS) production, decrease in the absorbtion of excess nutrients/heavy metals, and induction of abiotic stress resistance genes. Experimental evidence also suggests that stimulated plant growth by these bacteria is the net result of various mechanisms of action that are activated simultaneously. In this review paper, we reviewed the action mechanisms through which PGPRs could alleviate abiotic stresses (salinity, drought, heavy metal toxicity, and nutritional imbalance) in plants. Use of PGPRs is predicted to become a suitable strategy and an emerging trend in sustainable enhancement of plant growth. Generally, ACC deaminase and IAA-producing bacteria can be a good option for optimal crop production and production of bio-fertilizers in the future due to having multiple potentials in alleviating stresses of salinity, drought, nutrient imbalance, and heavy metals toxicity in plants. This review paper also emphasizes future research needs about the combined utilization of stress tolerant-PGPRs with multiple plant growth promoting (PGP) characteristics under environmental stresses.
Subfields: Plant Science
View Paper: https://www.semanticscholar.org/paper/5cc26ecae91c0ede99cf23a5b1f57d4801c5cad1
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Citations in the corpus
- Plant-Growth-Promoting Bacteria Mitigating Soil Salinity Stress in Plants (2020, background): “The bipolymers play an irreplaceable role in plant–microorganisms relationships, especially in the alleviation of plant salinity stress [17,36,55,137], as they are excreted out of the cells and bind cations like Na+ in decreasing bioavailable concentration, but also serve as signal molecules for the”
- Plant Growth Promoting Rhizobacterial Mitigation of Drought Stress in Crop Plants: Implications for Sustainable Agriculture (2019, background): “The quantity of abscisic acid in maize plants inoculated with Azospirillum Lipoferum increased, resulting in stomata closure arising from a low transpirational loss of water [2,120].”
- Plant Growth Promoting Rhizobacteria (PGPR) as Green Bioinoculants: Recent Developments, Constraints, and Prospects (2021, background): “They can act as biofertilizers that promote plants’ growth and development by facilitating biotic and abiotic stress tolerance and supporting host plants’ nutrition [64,86,91,92].”
- Plant growth-promoting root-colonizing bacterial endophytes (2021, positive): “For example, Rhizobacter spp. and other nitrogen fixers have been employed in agricultural management (Etesami, 2018).”