Phytohormones and Beneficial Microbes: Essential Components for Plants to Balance Stress and Fitness

By D. Egamberdieva, S. Wirth, Abdulaziz A. Alqarawi, E. F. Abd_Allah, A. Hashem. Frontiers in Microbiology, 2017

628 citations recorded by the source corpus.

Plants are subjected to various abiotic stresses, such as drought, extreme temperature, salinity, and heavy metals. Abiotic stresses have negative impact on the physiology and morphology of plants through defects in the genetic regulation of cellular pathways. Plants employ several tolerance mechanisms and pathways to avert the effects of stresses that are triggered whenever alterations in metabolism are encountered. Phytohormones are among the most important growth regulators; they are known for having a prominent impact on plant metabolism, and additionally, they play a vital role in the stimulation of plant defense response mechanisms against stresses. Exogenous phytohormone supplementation has been adopted to improve growth and metabolism under stress conditions. Recent investigations have shown that phytohormones produced by root-associated microbes may prove to be important metabolic engineering targets for inducing host tolerance to abiotic stresses. Phytohormone biosynthetic pathways have been identified using several genetic and biochemical methods, and numerous reviews are currently available on this topic. Here, we review current knowledge on the function of phytohormones involved in the improvement of abiotic stress tolerance and defense response in plants exposed to different stressors. We focus on recent successes in identifying the roles of microbial phytohormones that induce stress tolerance, especially in crop plants. In doing so, this review highlights important plant morpho-physiological traits that can be exploited to identify the positive effects of phytohormones on stress tolerance. This review will therefore be helpful to plant physiologists and agricultural microbiologists in designing strategies and tools for the development of broad spectrum microbial inoculants supporting sustainable crop production under hostile environments.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/c81806f52dbee27fc4a1002c6dd294a44452d476

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Citations in the corpus

Beneficial fungal communities from different habitats and their roles in plant growth promotion and soil health (2020, background): “2015) have been reported for auxin production, whereas, Fagus sylvatica(Egamberdieva et al. 2017), Rhizopus stolonifer, Pencillium funiculosum, P.”
A Review on Practical Application and Potentials of Phytohormone-Producing Plant Growth-Promoting Rhizobacteria for Inducing Heavy Metal Tolerance in Crops (2020, background): “Although very small amounts of phytohormones are produced by soil microbes, they are very crucial for plant metabolic processes [20,147,148].”
Plant-Growth-Promoting Bacteria Mitigating Soil Salinity Stress in Plants (2020, background): “Both cytokinins and gibberellic acid play important roles in plant physiological processes in the regulation of protein synthesis, seed germination and cell division and elongation, and chlorophyll accumulation, among others [11,60,70].”