Autophagy targets Hd1 for vacuolar degradation to regulate rice flowering  

作　　者：Zhi Hu Zhipan Yang Yi Zhang Aihong Zhang Qingtao Lu Ying Fang Congming Lu 

机构地区：[1]Key Laboratory of Photobiology,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]State Key Laboratory of Crop Biology,College of Life Science,Shandong Agricultural University,Taian,Shandong 271018,China

出　　处：《Molecular Plant》2022年第7期1137-1156,共20页分子植物（英文版）

基　　金：supported by the National Key Research and Development Program of China(2020YFA0907602);the National Natural Science Foundation of China(31730102).

摘　　要：Flowering time(heading date)is a critical agronomic trait that determines the yield and regional adaptability of crops.Heading date 1(Hd1)is a central regulator of photoperiodic flowering in rice(Oryza sativa).However,how the homeostasis of Hd1 protein is achieved is poorly understood.Here,we report that the nuclear autophagy pathway mediates Hd1 degradation in the dark to regulate flowering.Loss of autophagy function results in an accumulation of Hd1 and delays flowering under both short-day and long-day conditions.In the dark,nucleus-localized Hd1 is recognized as a substrate for autophagy and is subjected to vacuolar degradation via the autophagy protein OsATG8.The Hd1-0sATG8 interaction is required for autophagic degradation of Hd1 in the dark.Our study reveals a new mechanism by which Hd1 protein homeostasis is regulated by autophagy to control rice flowering.Our study also indicates that the regulation of flowering by autophagic degradation of Hd1 orthologs may have arisen over the course of mesangiosperm evolution,which would have increased their flexibility and adaptability to the environment by modulating flowering time.

关 键 词：AUTOPHAGY heading date RICE Hd1 homeostasis 

分 类 号：S51[农业科学—作物学]