The PHYB–FOF2–VOZ2 module functions to finetune flowering in response to changes in light quality by modulating FLC expression in Arabidopsis  

作　　者：Lina Qu Ming Zhong Feifei Duan Xinmei Li Jiaxin Yang Quanyu Zhou Dongying Tang Reqing He Xuanming Liu Xiaoying Zhao 

机构地区：[1]College of Biology,Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation,Hunan Engineering and Technology Research Center of Hybrid Rapeseed,Hunan University,Changsha 410082,China [2]Shenzhen Institute,Hunan University,Shenzhen 518057,China [3]These authors contributed equally to this article

出　　处：《Plant Communications》2024年第7期231-250,共20页植物通讯（英文）

基　　金：supported by the National Natural Science Foundation of China(32170252,U20A2029);the Natural Science Foundation of Guangdong Province(2022A1515010968);the Natural Science Foundation of Hunan Province(2021JJ30097,2022JJ30127);the Natural Science Foundation of Changsha City(kq2202150).

摘　　要：Proper timing of flowering under different environmental conditions is critical for plant propagation.Light quality is a pivotal environmental cue that plays a critical role in flowering regulation.Plants tend to flower late under light with a high red(R)/far-red(FR)light ratio but early under light with a low R/FR light ratio.However,how plants fine-tune flowering in response to changes in light quality is not well understood.Here,we demonstrate that F-box of Flowering 2(FOF2),an autonomous pathway–related regulator,physically interacts with VASCULAR PLANT ONE-ZINC FINGER 1 and 2(VOZ1 and VOZ2),which are direct downstream factors of the R/FR light receptor phytochrome B(PHYB).We show that PHYB physically interacts with FOF2,mediates stabilization of the FOF2 protein under FR light and end-of-day FR light,and enhances FOF2 binding to VOZ2,which leads to degradation of VOZ2 by SCF^(FOF2) E3 ligase.By contrast,PHYB mediates degradation of FOF2 protein under R light and end-of-day R light.Genetic interaction studies demonstrated that FOF2 functions downstream of PHYB to promote FLC expression and inhibit flowering under both high R/FR light and simulated shade conditions,processes that are partially dependent on VOZ proteins.Taken together,our findings suggest a novel mechanism whereby plants fine-tune flowering time through a PHYB–FOF2–VOZ2 module that modulates FLC expression in response to changes in light quality.

关 键 词：PHYB FOF2 VOZ proteins FLC light quality flowering time 

分 类 号：Q94[生物学—植物学]