1. 首页 > 资源库 > 中文 > 植物所论文库

Antagonistic HLH/bHLH Transcription Factors Mediate Brassinosteroid Regulation of Cell Elongation and Plant Development in Rice and Arabidopsis

作　　者：Zhang LY, Bai MY, Wu JX, Zhu JY, Wang H, Zhang ZG, Wang WF, Sun Y, Zhao J, Sun XH, Yang HJ, Xu YY, Kim Soo-Hwan, Shozo Fujioka, Lin WH, Chong, Lu TG, and Wang ZY
影响因子：9.296
刊物名称：The Plant Cell
出版年份：2009
卷：21  期：12  页码：3767-3780

论文摘要：

 In rice (Oryza sativa), brassinosteroids (BRs) induce cell elongation at the adaxial side of the lamina joint to promote leaf bending. We identified a rice mutant (ili1-D) showing an increased lamina inclination phenotype similar to that caused by BR treatment. The ili1-D mutant overexpresses an HLH protein homologous to Arabidopsis thaliana Paclobutrazol Resistance1
(PRE1) and the human Inhibitor of DNA binding proteins. Overexpression and RNA interference suppression of ILI1 increase
and reduce, respectively, rice laminar inclination, confirming a positive role of ILI1 in leaf bending. ILI1 and PRE1 interact
with basic helix-loop-helix (bHLH) protein IBH1 (ILI1 binding bHLH), whose overexpression causes erect leaf in rice and
dwarfism in Arabidopsis. Overexpression of ILI1 or PRE1 increases cell elongation and suppresses dwarf phenotypes
caused by overexpression of IBH1 in Arabidopsis. Thus, ILI1 and PRE1 may inactivate inhibitory bHLH transcription factors
through heterodimerization. BR increases the RNA levels of ILI1 and PRE1 but represses IBH1 through the transcription
factor BZR1. The spatial and temporal expression patterns support roles of ILI1 in laminar joint bending and PRE1/At IBH1 in the transition from growth of young organs to growth arrest. These results demonstrate a conserved mechanism of BR
regulation of plant development through a pair of antagonizing HLH/bHLH transcription factors that act downstream of
BZR1 in Arabidopsis and rice.
全文链接：
版权所有 © 中国科学院植物研究所　备案号：京ICP备16067583号-24　文保网安备案号：1101080078
地址：北京市海淀区香山南辛村20号　邮编：100093
电话：010-62590835