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IPA1 functions as a downstream transcription factor repressed by D53 in strigolactone signaling in rice
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IPA1 functions as a downstream transcription factor repressed by D53 in strigolactone signaling in rice
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IPA1 functions as a downstream transcription factor repressed by D53 in strigolactone signaling in rice
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Journal Article
IPA1 functions as a downstream transcription factor repressed by D53 in strigolactone signaling in rice
2017
Overview
Strigolactones （SLs）, a group of carotenoid derived terpenoid lactones, are root-to-shoot phytohormones sup- pressing shoot branching by inhibiting the outgrowth of axillary buds. DWARF 53 （D53）, the key repressor of the SL signaling pathway, is speculated to regulate the downstream transcriptional network of the SL response. However, no downstream transcription factor targeted by D53 has yet been reported. Here we report that Ideal Plant Architecture 1 （IPA1）, a key regulator of the plant architecture in rice, functions as a direct downstream component of D53 in reg- ulating tiller number and SL-induced gene expression. We showed that D53 interacts with IPA1 in vivo and in vitro and suppresses the transcriptional activation activity of IPA1. We further showed that IPA1 could directly bind to the D53 promoter and plays a critical role in the feedback regulation of SL-induced D53 expression. These findings re- veal that IPA1 is likely one of the long-speculated transcription factors that act with D53 to mediate the SL-regulated tiller development in rice.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ Biomedical and Life Sciences
/ Buds
/ Feedback
/ Gene Expression Regulation, Plant - drug effects
/ Lactones
/ Original
/ Promoter Regions, Genetic - genetics
/ Protein Binding - drug effects
/ Repressor Proteins - metabolism
/ Signal Transduction - drug effects
/ Trans-Activators - metabolism
/ Transcription Factors - metabolism
/ Transcription, Genetic - drug effects
/ Transcriptional Activation - drug effects
/ Transcriptional Activation - genetics
/ 信号通路
/ 有效分蘖数
/ 水稻
/ 理想株型
/ 类胡萝卜素
/ 萜类内酯
/ 转录因子
/ 转录激活活性
