FT5a interferes with the Dt1-AP1 feedback loop to control flowering time and shoot determinacy in soybean  

作　　者：Lin Yue Xiaoming Li Chao Fang Liyu Chen Hui Yang Jie Yang Zhonghui Chen Haiyang Nan Linnan Chen Yuhang Zhang Haiyang Li Xingliang Hou Zhicheng Dong James LWeller Jun Abe Baohui Liu Fanjiang Kong 

机构地区：[1]School of Life Sciences,Innovative Center of Molecular Genetics and Evolution,Guangzhou University,Guangzhou 510006,China [2]Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement&Guangdong Provincial Key Laboratory of Applied Botany,South China Botanical Garden,the Chinese Academy of Sciences,Guangzhou 510650,China [3]University of the Chinese Academy of Sciences,Beijing 100049,China [4]National Key Laboratory of Crop Genetics and Germplasm Enhancement,National Center for Soybean Improvement,Nanjing Agricultural University,Nanjing 210095,China [5]School of Natural Sciences,University of Tasmania,Hobart,Tasmania 7001,Australia [6]Research Faculty of Agriculture,Hokkaido University,Sapporo 060‐8589,Japan [7]The Innovative Academy of Seed Design,Key Laboratory of Soybean Molecular Design Breeding,Northeast Institute of Geography and Agroecology,the Chinese Academy of Sciences,Harbin 1500000,Chin

出　　处：《Journal of Integrative Plant Biology》2021年第6期1004-1020,共17页植物学报（英文版）

基　　金：funded by the Major Program of Guangdong Basic and Applied Research(2019B030302006);supported by the National Natural Science Foundation of China(31930083,31901567,31901499,31801384);the China Postdoctoral Science Foundation(2019M662843,2019M652839,2019M662842)。

摘　　要：Flowering time and stem growth habit determine inflorescence architecture in soybean, which in turn influences seed yield. Dt1, a homolog of Arabidopsis TERMINAL FLOWER 1(TFL1), is a major controller of stem growth habit, but its underlying molecular mechanisms remain unclear.Here, we demonstrate that Dt1 affects node number and plant height, as well as flowering time,in soybean under long-day conditions. The b ZIP transcription factor FDc1 physically interacts with Dt1, and the FDc1-Dt1 complex directly represses the expression of APETALA1(AP1). We propose that FT5 a inhibits Dt1 activity via a competitive interaction with FDc1 and directly upregulates AP1. Moreover, AP1 represses Dt1 expression by directly binding to the Dt1 promoter, suggesting that AP1 and Dt1 form a suppressive regulatory feedback loop to determine the fate of the shoot apical meristem. These findings provide novel insights into the roles of Dt1 and FT5 a in controlling the stem growth habit and flowering time in soybean, which determine the adaptability and grain yield of this important crop.

关 键 词：AP1 Dt1 FDc1 FLOWERING FT5a SOYBEAN stem growth habit 

分 类 号：S565.1[农业科学—作物学]