机制(生物学)
非生物胁迫
非生物成分
化学
生物化学
细胞生物学
生物
生态学
物理
基因
量子力学
作者
Ankush Ashok Saddhe,Kumar Kundan,Padmanabh Dwivedi
标识
DOI:10.1002/9781118889022.ch8
摘要
The productivity and development of plants are severely affected by numerous abiotic stresses. Plants are endowed with adaptive strategies to combat unfavorable conditions by modulating their fate of transcription, signal transduction, ion transport, and metabolic pathways. Plants regulate and coordinate towards growth and stress tolerance to promote their survival. They also avoid environmental stress by modification in the production, distribution, and signal transduction of various plant hormones. Abscisic acid (ABA) is acclaimed as a stress modulator phytohormone and one of the foremost endogenous signaling molecules. The intracellular ABA receptor family, called the pyrabactin resistance 1/pyrabactin like/regulator component of ABA receptor (PYR/PYL/RCAR), protein phosphatase PP2C, and SnRK2 kinase, are considered as crucial regulatory components of ABA dependent signaling pathways. During stress conditions, the PYL receptor blocks PP2C phosphatase activity by forming a ternary complex with ABA and allows phosphorylation of SnRK2 kinase, thereby phosphorylating AREB/ABF transcription factors. In the present chapter, we summarize and investigate the participation of ABA and its downstream signaling components with a view towards understanding plant responsive mechanisms against various abiotic stresses.
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