PIF4 and PIF5 Transcription Factors Link Blue Light and Auxin to Regulate the Phototropic Response in Arabidopsis

被引：139

作者：

Sun, Jiaqiang ^{[1
]}

Qi, Linlin ^{[1
]}

Li, Yanan ^{[1
]}

Zhai, Qingzhe ^{[1
]}

Li, Chuanyou ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Genet & Dev Biol, Natl Ctr Plant Gene Res, State Key Lab Plant Gen, Beijing 100101, Peoples R China

来源：

PLANT CELL | 2013年 / 25卷 / 06期

基金：

中国国家自然科学基金;

关键词：

PHYTOCHROME INTERACTING FACTORS; DIFFERENTIAL GROWTH; NEGATIVE REGULATOR; GENOMIC ANALYSIS; CIRCADIAN CLOCK; PROTEIN; NPH1; PHOTORECEPTOR; BIOSYNTHESIS; DEGRADATION;

D O I：

10.1105/tpc.113.112417

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Both blue light (BL) and auxin are essential for phototropism in Arabidopsis thaliana. However, the mechanisms by which light is molecularly linked to auxin during phototropism remain elusive. Here, we report that PHYTOCHROME INTERACTING FACTOR4 (PIF4) and PIF5 act downstream of the BL sensor PHOTOTROPIN1 (PHOT1) to negatively modulate phototropism in Arabidopsis. We also reveal that PIF4 and PIF5 negatively regulate auxin signaling. Furthermore, we demonstrate that PIF4 directly activates the expression of the AUXIN/INDOLE-3-ACETIC ACID (IAA) genes IAA19 and IAA29 by binding to the G-box (CACGTG) motifs in their promoters. Our genetic assays demonstrate that IAA19 and IAA29, which physically interact with AUXIN RESPONSE FACTOR7 (ARF7), are sufficient for PIF4 to negatively regulate auxin signaling and phototropism. This study identifies a key step of phototropic signaling in Arabidopsis by showing that PIF4 and PIF5 link light and auxin.

引用

页码：2102 / 2114

页数：13

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