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

查看全文 作　　者：Huwei [1,2]Sun;Xiaoli [2]Guo;Xiuli [2]Zhu;Pengyuan [1]Gu;Wei [1]Zhang;Wenqing [1]Tao;Daojian [1]Wang;Yunzhe [3]Wu;Quanzhi [2]Zhao;Guohua [1]Xu;Xiangdong [3,4]Fu;Yali [1]Zhang 高影响力作者 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高影响力机构 出　　处：《Molecular Plant》索引2023年第16卷第3期,共11页高影响力期刊 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
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