AUXIN RESPONSE FACTOR 18-HISTONE DEACETYLASE 6 module regulates floral organ identity in rose (Rosa hybrida).

AUXIN RESPONSE FACTOR 18-HISTONE DEACETYLASE 6 module regulates floral organ identity in rose (Rosa hybrida).
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生长素反应因子 18-组蛋白脱乙酰酶 6 模块调节玫瑰 (Rosa Hydra) 的花器官特性

DOI:
10.1093/plphys/kiab130
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发表时间:
2021-06-11
期刊:
影响因子:
7.4
通讯作者:
Ma N
Ma N
中科院分区:
生物学1区
文献类型:
--
作者:
Chen J;Li Y;Li Y;Li Y;Wang Y;Jiang C;Choisy P;Xu T;Cai Y;Pei D;Jiang CZ;Gan SS;Gao J;Ma N

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生长素的局部分布控制着玫瑰花分生组织中花瓣和雄蕊的同一性。植物激素生长素在花分生组织的发生和雌蕊群的发育中起着关键作用,但生长素是否以及如何控制花器官的特性仍不清楚。在这里,我们发现,生长素水平的影响器官规格,生长素水平的变化影响花瓣和雄蕊之间的同源异型转化玫瑰(月季)。PIN-FORMED-LIKES(PILS)基因RhPILS 1在花器官发生期间控制花芽中的生长素水平。生长素反应因子18(RhARF 18),其表达随生长素含量的增加而降低,编码C类基因RhAGAMOUS(RhAG)的转录阻遏物,并以生长素依赖的方式控制雄蕊花瓣器官特化。此外,RhARF 18与组蛋白脱乙酰基酶(HDA)RhHDA 6物理相互作用。RhHDA 6的沉默增加了RhAG启动子中与RhARF 18结合位点相邻的位点处的H3 K9/K14乙酰化水平,并减少了花瓣数,表明RhARF 18可能将RhHDA 6募集到RhAG启动子以加强对RhAG转录的抑制。我们提出了一个生长素稳态如何通过调节RhAG的转录来控制花器官身份的模型
The local distribution of auxin controls petal and stamen identity in the floral meristem of rose. 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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