Strigolactones and Brassinosteroids Antagonistically Regulate the Stability of the D53-OsBZR1 Complex to Determine FC1 Expression in Rice Tillering
作者机构：National Key Laboratory of Crop Genetic Improvement and Center of Integrative BiologyCollege of Life Science and TechnologyHuazhong Agricultural UniversityWuhan 430070 China College of Agricultural SciencesGuizhou UniversityGuiyang 550025 China Department of GeneticsSchool of Life SciencesFudan UniversityShanghai 200438 China
出 版 物：《Molecular Plant》 (分子植物（英文版）)
年 卷 期：2020年第13卷第4期
页 面：586-597页
核心收录：
学科分类：0710[理学-生物学] 09[农学] 0901[农学-作物学] 0902[农学-园艺学]
基 金：This work was supported by grants from NNSFC(31430046 to X.W.),NKRDP(2016YFD0100403 to S.S.,2016YFD0100700 to Z.F.),ICPNNSFC(31661143024 to X.W.),MAITP(0120150092 to X.W.) School Independent Scientific and Technological Innovation Foundation and Research Startup Foundation of Huazhong Agricultural University(2662015PY020,2014RC002 to X.W.).
主 题：rice tillering,strigolactones brassinosteroids D53 OsBZFM FCY
摘 要：Rice tillering,a key architecture trait determ ining grain yield,is highly regulated by a class of newly identified phytohorm ones,strigolactones(SLs).How ever,the whole SL signaling pathw ay from the receptor to dow nstream transcription factors to finally inhibit tillering remains unrevealed.In this study,we first found that brassinosteroids(BRs)strongly enhance tillering by prom oting bud outgrow th in rice,which is largely different from the function of BRs in Arabidopsis.Genetic and biochem ical analyses indicated that both the SL and BR signaling pathw ays control rice tillering by regulating the stability of D53 and/or the OsBZR1 RLA1-DLT module,a transcriptional complex in the rice BR signaling pathway.We further found that D53 interacts with OsBZR1 to inhibit the expression of FC1,a local inhibitor of tillering,and that this inhibition depends on direct DNA binding by OsBZR1,which recruits D53 to the FC1 promoter in rice buds.Taken together,these findings uncover a mechanism illustrating how SLs and BRs coordinately regulate rice tillering via the early responsive gene FC1.
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