Background

The initiation of flowering transition in rice (Oryza sativa) is a complex process regulated by genes and environment. In particular, drought can interfere with flowering; therefore, many plants hasten this process to shorten their life cycle under water scarcity, and this is known as drought-escape response. However, rice has other strategies; for example, drought stress can delay flowering instead of accelerating it. RICE CENTRORADIALIS 1 (RCN1) is a TERMINAL FLOWER-like gene that influences rice flowering transition and spike differentiation. It interacts with 14–3-3 proteins and transcription factor OsFD1 to form a florigen repression complex that suppresses flowering transition in rice.

Results

In this study, we explored the role of RCN1 in the molecular pathway of drought-regulated flowering transition. The rcn1 mutant plants displayed early heading under both normal water and drought stress conditions, and they were more insensitive to drought stress than the wild-type plants. Abscisic acid (ABA) signaling-mediated drought-induced RCN1 is involved in this process.

Conclusions

Thus, RCN1 plays an important role in the process of drought stress inhibiting flowering transition. It may worked by suppressing the protein function rather than transcription of HEADING DATE 3a.

中文翻译：

---

水稻TCENT1基因CENTRORADIALIS 1对干旱胁迫作出反应并调节水稻开花期。

背景

水稻（Oryza sativa）的花期开始是一个受基因和环境调控的复杂过程。特别是干旱会干扰开花。因此，许多植物在缺水的情况下加快了这个过程，缩短了它们的生命周期，这就是所谓的逃旱反应。但是，大米还有其他策略。例如，干旱胁迫会延迟开花而不是加速开花。水稻中央RO1（RCN1）是一种类似终端花的基因，可影响水稻的开花过渡和穗分化。它与14–3-3蛋白和转录因子OsFD1相互作用，形成抑制水稻开花过渡的荧光原抑制复合物。

结果

在这项研究中，我们探索了RCN1在干旱调节花期过渡的分子途径中的作用。该RCN1突变植物显示抽穗早，正常水和干旱胁迫条件下，他们更不敏感，比野生型植物干旱胁迫。脱落酸（ABA）信号介导的干旱诱导的RCN1参与此过程。

结论

因此，RCN1在干旱胁迫抑制花期过渡过程中起着重要作用。它可以通过抑制蛋白质功能而不是HEADING DATE 3a的转录来起作用。