Strigolactone and gibberellin signaling coordinately regulate metabolic adaptations to changes in nitrogen availability in rice  

作　　者：Huwei Sun Xiaoli Guo Xiuli Zhu Pengyuan Gu Wei Zhang Wenqing Tao Daojian Wang Yunzhe Wu Quanzhi Zhao Guohua Xu Xiangdong Fu Yali Zhang 

机构地区：[1]National Key Laboratory of Crop Genetics&Germplasm Enhancement and Utilization,Key Laboratory of Plant Nutrition and Ferilization in Low-Middle Reaches of the Yangtze River,Ministry of Agriculture,Nanjing Agricultural University,Nanjing 210095,China [2]Key Laboratory of Rice Biology in Henan Province,Collaborative Innovation Center of Henan Grain Crops,Henan Agricultural University,Zhengzhou 450002,China [3]state Key Laboratoryof Plant Celland ChromosomeEngineering,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Bejing 100049,China [4]College of Life Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Molecular Plant》2023年第3期588-598,共11页分子植物（英文版）

基　　金：supported by the National Natural Science Foundation of China(grant nos.31830082,31972501,31672225,and 31601821);the National Key R&D Programme of China(2022YFD1200010-02 and 2022YFD1900702).

摘　　要：Modern semi-dwarf rice varieties of the“Green Revolution”require a high supply of nitrogen(N)fertilizer to produce high yields.A better understanding of the interplay between N metabolism and plant developmental processes is required for improved N-use efficiency and agricultural sustainability.Here,we show that strigolactones(SLs)modulate root metabolic and developmental adaptations to low N availability for ensuring efficient uptake and translocation of available N.The key repressor DWARF 53(D53)of the SL signaling pathway interacts with the transcription factor GROWTH-REGULATING FACTOR 4(GRF4)and prevents GRF4 from binding to its target gene promoters.N limitation induces the accumulation of SLs,which in turn promotes SL-mediated degradation of D53,leading to the release of GRF4 and thus promoting the expression of genes associated with N metabolism.N limitation also induces degradation of the DELLA protein SLENDER RICE 1(SLR1)in an D14-and D53-dependent manner,effectively releasing GRF4 from competitive inhibition caused by SLR1.Collectively,our findings reveal a previously unrecognized mechanism underlying SL and gibberellin crosstalk in response to N availability,advancing our understanding of plant growth–metabolic coordination and facilitating the design of the strategies for improving N-use efficiency in high-yield crops.

关 键 词：GRF4 nitrogen-use efficiency Oryza sativa SLR1 STRIGOLACTONES 

分 类 号：S511[农业科学—作物学]