FT5a interferes with the Dt1-AP1 feedback loop to control flowering time and shoot determinacy in soybean,Journal of Integrative Plant Biology

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FT5a interferes with the Dt1-AP1 feedback loop to control flowering time and shoot determinacy in soybean
Journal of Integrative Plant Biology ( IF 9.3 ) Pub Date : 2021-01-17 , DOI: 10.1111/jipb.13070
Lin Yue ₁ , Xiaoming Li ₂ , Chao Fang ₁ , Liyu Chen ₁ , Hui Yang ₁ , Jie Yang ₂ , Zhonghui Chen _{2,

3} , Haiyang Nan ₁ , Linnan Chen ₁ , Yuhang Zhang ₁ , Haiyang Li _{1,

4} , Xingliang Hou ₅ , Zhicheng Dong ₁ , James L Weller ₅ , Jun Abe ₆ , Baohui Liu _{1,

7} , Fanjiang Kong _{1,

7}

Affiliation

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 bZIP transcription factor FDc1 physically interacts with Dt1, and the FDc1-Dt1 complex directly represses the expression of APETALA1 (AP1). We propose that FT5a 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 FT5a in controlling the stem growth habit and flowering time in soybean, which determine the adaptability and grain yield of this important crop.

中文翻译：

FT5a 干扰 Dt1-AP1 反馈环路以控制大豆开花时间和芽决定性

开花时间和茎生长习性决定大豆的花序结构，进而影响种子产量。 Dt1是拟南芥终端花1 （ TFL1 ）的同源物，是茎生长习性的主要控制者，但其潜在的分子机制仍不清楚。在这里，我们证明Dt1在长日照条件下影响大豆的节数和株高以及开花时间。 bZIP 转录因子 FDc1 与 Dt1 发生物理相互作用，FDc1-Dt1 复合物直接抑制APETALA1 ( AP1 ) 的表达。我们认为 FT5a 通过与 FDc1 竞争性相互作用抑制 Dt1 活性并直接上调AP1 。此外，AP1通过直接结合Dt1启动子来抑制Dt1表达，表明AP1和Dt1形成抑制性调节反馈环来决定茎尖分生组织的命运。这些发现为 Dt1 和 FT5a 在控制大豆茎生长习性和开花时间中的作用提供了新的见解，这决定了这种重要作物的适应性和谷物产量。

更新日期：2021-01-17

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