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

Frontiers in Microbiology

卷:8

Dilfuza Egamberdieva²  Stephan J. Wirth²  Abeer Hashem³  Abdulaziz A. Alqarawi⁴  Elsayed F. Abd_Allah⁴ 

[1] Botany and Microbiology Department, College of Science, King Saud University, Riyadh, Saudi Arabia;

[2] Leibniz Centre for Agricultural Landscape Research, Institute of Landscape Biogeochemistry, Müncheberg, Germany;

[3] Mycology and Plant Disease Survey Department, Plant Pathology Research Institute, Giza, Egypt;

[4] Plant Production Department, College of Food and Agricultural Sciences, King Saud University, Riyadh, Saudi Arabia;

关键词: abiotic stress;    plant microbiome;    metabolites;    phytohormones;   

DOI  :  10.3389/fmicb.2017.02104

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown