生长素
同源异型基因
生物
花瓣
抑制因子
雄蕊
细胞生物学
组蛋白脱乙酰基酶
抄写(语言学)
恶毒的
HDAC1型
异位表达
MADS箱
遗传学
组蛋白
基因
拟南芥
转录因子
植物
花粉
突变体
哲学
语言学
作者
Jiwei Chen,Yang Li,Yonghong Li,Yuqi Li,Yi Wang,Chuyan Jiang,Patrick Choisy,Xu Tao,Youming Cai,Dong Pei,Cai‐Zhong Jiang,Susheng Gan,Junping Gao,Nan Ma
出处
期刊:Plant Physiology
[Oxford University Press]
日期:2021-03-17
卷期号:186 (2): 1074-1087
被引量:32
标识
DOI:10.1093/plphys/kiab130
摘要
Abstract The phytohormone auxin plays a pivotal role in floral meristem initiation and gynoecium development, but whether and how auxin controls floral organ identity remain largely unknown. Here, we found that auxin levels influence organ specification, and changes in auxin levels influence homeotic transformation between petals and stamens in rose (Rosa hybrida). The PIN-FORMED-LIKES (PILS) gene RhPILS1 governs auxin levels in floral buds during floral organogenesis. RhAUXIN RESPONSE FACTOR 18 (RhARF18), whose expression decreases with increasing auxin content, encodes a transcriptional repressor of the C-class gene RhAGAMOUS (RhAG), and controls stamen–petal organ specification in an auxin-dependent manner. Moreover, RhARF18 physically interacts with the histone deacetylase (HDA) RhHDA6. Silencing of RhHDA6 increases H3K9/K14 acetylation levels at the site adjacent to the RhARF18-binding site in the RhAG promoter and reduces petal number, indicating that RhARF18 might recruit RhHDA6 to the RhAG promoter to reinforce the repression of RhAG transcription. We propose a model for how auxin homeostasis controls floral organ identity via regulating transcription of RhAG
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