Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China.
State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, China.
Plant Signal Behav. 2020 Mar 3;15(3):1726636. doi: 10.1080/15592324.2020.1726636. Epub 2020 Feb 11.
Phytochrome A (phyA) is the primary photoreceptor mediating various plant responses to far-red (FR) light. The defense-related phytohorme jasmonic acid (JA) has been shown recently to play a role in regulating phyA-mediated FR signaling. However, the detailed molecular mechanisms governing phyA- and JA-mediated signaling cross talks are still not well understood. Here, we uncover a molecular cascade in which JAZ1 inactivates phyA signaling through repressing the transcriptional activity of FHY3 on and . Furthermore, we demonstrate that the expression levels of and , and some FR response genes are reduced in the mutant. These findings unveil a previously unrecognized mechanism whereby JA modulates phyA signaling through repressing the activities of FHY3 by JAZs.
光敏色素 A（phyA）是介导植物对远红（FR）光各种反应的主要光受体。最近有研究表明，与防御相关的植物激素茉莉酸（JA）在调节 phyA 介导的 FR 信号转导中发挥作用。然而，调节 phyA 和 JA 介导的信号转导交叉对话的详细分子机制仍不清楚。在这里，我们揭示了一个分子级联反应，其中 JAZ1 通过抑制 FHY3 在 和 上的转录活性来失活 phyA 信号。此外，我们证明，在 突变体中， 和 以及一些 FR 反应基因的表达水平降低。这些发现揭示了一种以前未被识别的机制，即 JA 通过 JAZs 抑制 FHY3 的活性来调节 phyA 信号。
