Role of BRs in Plant Response to Abiotic Stress

doi:10.13560/j.cnki.biotech.bull.1985.2021-0448

Abstract

Abstract:

BRs（brassinosteroids）are polyhydroxylated phytosteroid that are common in the plant kingdom,and they not only regulate plant growth and development,but also play important roles in biotic and abiotic stress responses. Here the biosynthesis and signal transduction pathways of BRs are summarized,focusing on the molecular mechanism of BRs in plant response to abiotic stress response. And the future research direction of BRs is prospected. It provides theoretical basis for further understanding BR-mediated regulatory network of abiotic stresses and improving stress resistance of crops to abiotic stresses.

Key words: brassinosteroid, signal transduction, abiotic stress

LI Wen-jiao, ZHANG Zhong-feng, LIU Qing, SUN Jie, YANG Li, WANG Xing-jun, ZHAO Shu-zhen. Role of BRs in Plant Response to Abiotic Stress[J]. Biotechnology Bulletin, 2022, 38(1): 228-235.

Figures/Tables 2

Fig. 1 Biosynthetic pathway pattern of BRs[6,7] During BR biosynthesis,a unique precursor molecule known as brassinosterol（CR）,which can be converted into the bioactive form of CS and BL via several pathways[6]. These pathways consist of the early C-6 oxidation pathway,the late C-6 oxidation pathway at C-6,as well as the early C-22 hydroxylation pathway at C-22. Amidst these pathways,DWF4 and CPD were identified as C-22 hydroxylase and C-3 oxidase respectively in Arabidopsis thaliana followed by ROT3 and CYP90D1 as C-23 hydroxylases,PsDDWF1 as C-2 hydroxylase,BR6ox1 and BR6ox2 as C-6 oxidases,and DET2 as the reductase. In addition,OsD2 and OsD11 were identified as the C-3 dehydrogenase and C-3 hydroxylase respectively

Fig. 2 Response of BRs to abiotic stress BR1 and BAK1 were identified as BR receptors and co-receptors,respectively. BIN2 was reported as the negative regulator during the signaling pathway BRs. Moreover,BZR1 and BES1 were identified as important transcription factors,which controlled their expression by interacting with downstream target genes in the BRs signaling pathway. Plants may be synergistically antagonized with other transcription factors to be involved in the abiotic stresses when they are exposed to various abiotic stresses

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