Progress on the biosynthesis and signal transduction of phytohormone salicylic acid
Xiao Yong Gu1, Yang Liu1, Li Jing Liu1
1School of Life Sciences, Shandong University, Qingdao 266237, China.
Abstract:
The phenolic phytohormone salicylic acid (SA) is widely produced in plants, and is a key player in many processes of plant physiology, especially in plant immunity. During pathogen infection, SA is accumulated and the SA signaling pathway is activated to induce the expression of defense-related genes. Recently, a series of SA-related studies have been published. These researches filled gaps in the two SA biosynthesis pathways: the isochorismate synthase (ICS) pathway and the phenylalanine ammonia-lyase (PAL) pathway. The NPR1 (nonexpresser of PR genes 1) and its paralogs, NPR3 and NPR4, were identified as SA receptors. The effect of type II TGAs (TGACG-binding factor) on SA downstream genes was shown to depend on the SA receptor they interacted with. This review will systematically introduce the progress on SA biosynthesis and signal transduction, aiming to provide a theoretical reference for in-depth study of SA regulation on plant development and defense responses.
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