Arabidopsis phytochromes A and B synergistically repress SPA1 under blue light  

作　　者：Xiaolin Jia Meifang Song Shaoci Wang Tong Liu Lijian Wang Lin Guo Liang Su Yong Shi Xu Zheng Jianping Yang 

机构地区：[1]State Key Laboratory of Wheat and Maize Crop Science,and Center for Crop Genome Engineering,Longzi Lake Campus,College of Agronomy,Henan Agricultural University,Zhengzhou 450046,China [2]Institute of Radiation Technology,Beijing Academy of Science and Technology,Beijing 100875,China [3]Institute of Crop Sciences,Chinese Academy of Agricultural Sciences,Beijing 100081,China [4]Henan Police College,Zhengzhou 450046,China [5]Beijing Genseed Technology Co.,Ltd.,Beijing 100080,China

出　　处：《Journal of Integrative Plant Biology》2023年第4期888-894,共7页植物学报（英文版）

基　　金：supported by funds from the National Natural Science Foundation of China 31871709,31570268,31400259,and 31170267。

摘　　要：In Arabidopsis,although studies have demonstrated that phytochrome A(phyA)and phyB are involved in blue light signaling,how blue light-activated phytochromes modulate the activity of the CONSTITUTIVELY PHOTOMORPHOGENIC1(COP1)-SUPPRESSOR OF PHYA-105(SPA1)E3 complex remains largely unknown.Here,we show that phyA responds to early and weak blue light,whereas phyB responds to sustainable and strong blue light.Activation of both phyA and phyB by blue light inhibits SPA1 activity.Specifically,blue light irradiation promoted the nuclear import of both phytochromes to stimulate their binding to SPA1,abolishing SPA1’s interaction with LONG HYPOCOTYL 5(HY5)to release HY5,which promoted seedling photomorphogenesis.

关 键 词：ARABIDOPSIS blue light PHYTOCHROME SPA1 

分 类 号：Q945[生物学—植物学]