Two central circadian oscillators OsPRR59 and OsPRR95 modulate magnesium homeostasis and carbon fixation in rice  

作　　者：Chun-Qu Chen Xin-Yue Tian Jian Li Shuang Bai Zhuo-Yan Zhang Yuan Li Hong-Rui Cao Zhi-Chang Chen 

机构地区：[1]Root Biology Center,Fujian Agriculture and Forestry University,Fuzhou 350002,China [2]College of Biological and Environmental Engineering,Binzhou University,Binzhou 256603,China

出　　处：《Molecular Plant》2022年第10期1602-1614,共13页分子植物（英文版）

基　　金：the National Nat-ural Science Foundation of China(nos.32022077 and 31872171).

摘　　要：Photosynthesis,which provides oxygen and energy for all living organisms,is circadian regulated.Photosynthesis-associated metabolism must tightly coordinate with the circadian clock to maximize the efficiency of the light-energy capture and carbon fixation.However,the molecular basis for the interplay of photosynthesis and the circadian clock is not fully understood,particularly in crop plants.Here,we report two central oscillator genes of circadian clock,OsPRR95 and OsPRR59 in rice,which function as transcriptional repressors to negatively regulate the rhythmic expression of OsMGT3 encoding a chloroplast-localized Mg2+transporter.OsMGT3-dependent rhythmic Mg fluctuations modulate carbon fixation and consequent sugar output in rice chloroplasts.Furthermore,sugar triggers the increase of superoxide,which may act as a feedback signal to positively regulate the expression of OsPRR95 and OsPRR59.Taken together,our results reveal a negative-feedback loop that strengthens the crosstalk between photosynthetic carbon fixation and the circadian clock,which may improve plan adaptation and performance in fluctuating environments.

关 键 词：OsPRR OsMGT3 PHOTOSYNTHESIS MAGNESIUM RICE 

分 类 号：S511[农业科学—作物学]