Brassinosteroids promote anthocyanin biosynthesis under low nitrogen conditions in Arabidopsis
作者单位：School of Life Sciences and State Key Laboratory of AgribiotechnologyShenzhen Research InstituteThe Chinese University of Hong Kong
会议名称：《2016年全国植物生物学大会》
会议日期：2016年
学科分类：0710[理学-生物学] 071001[理学-植物学] 07[理学]
关 键 词：brassinosteroids nitrogen stress anthocyanin biosynthesis Arabidopsis thaliana
摘 要：Brassinosteroids(BRs) are steroid plant hormones that regulate many developmental and physiological processes in pants including responses to stress. However,little is known about BR regulation of plant responses to mineral nutrients. Our recent studies indicate that BR can induce plant tolerance to low nitrogen(N) stress in Arabidopsis and enhance low N-induced anthocyanin biosynthesis,which seem to be both mediated by the BR-activated transcription factor BZR1. BZR1 physically interacts with PAP1,a key transcription factor controlling anthocyanin biosynthesis in Arabidopsis,and enhances PAP1′s transcriptional regulatory activity on its target genes in anthocyanin biosynthesis. BZR1 can also bind the promoters of some of the anthocyanin biosynthetic genes but the binding appears to be not specific,suggesting that BR promotes anthocyanin biosynthesis under low N mainly through BZR1-PAP1 interaction. As a conclusion,our study indicates that BR is capable of promoting low N-induced anythocyanin biosynthesis,which may help plants survive the low N stress conditions.