A warm temperature-released negative feedback loop fine-tunes PIF4-mediated thermomorphogenesis in Arabidopsis

文献类型： 外文期刊

第一作者： Li, Hui

作者： Li, Hui;Xue, Mande;Zhao, Fengyue;Li, Xiaoyi;Jiang, Danhua;Li, Hui;Xue, Mande;Zhang, Huairen;Zhao, Fengyue;Li, Xiaoyi;Jiang, Danhua;Yu, Shuancang;Zhao, Fengyue

作者机构：

关键词： temperature; thermomorphogenesis; PIF4; GI; TOC1; feedback loop

期刊名称：PLANT COMMUNICATIONS （ 影响因子：10.5； 五年影响因子：10.5 ）

ISSN： 2590-3462

年卷期： 2024 年 5 卷 5 期

页码：

收录情况： SCI

摘要： Plants can sense temperature changes and adjust their growth accordingly. In Arabidopsis , high ambient temperatures stimulate stem elongation by activating a key thermoresponsive regulator, PHYTOCHROME INTERACTING FACTOR 4 (PIF4). Here, we show that warmth promotes the nighttime transcription of GI , which is necessary for the high temperature -induced transcription of TOC1 . Genetic analyses suggest that GI prevents excessive thermoresponsive growth by inhibiting PIF4, with this regulatory mechanism being partially reliant on TOC1. GI transcription is repressed by ELF3 and HY5, which concurrently inhibit PIF4 expression and activity. Temperature elevation causes the deactivation or degradation of ELF3 and HY5, leading to PIF4 activation and relief of GI transcriptional repression at high temperatures. This allows PIF4 to further activate GI transcription in response to elevated temperatures. GI, in turn, inhibits PIF4, establishing a negative feedback loop that fine-tunes PIF4 activity. In addition, we demonstrate that ELF3, HY5, and PIF4 regulate GI transcription by modulating the enrichment of histone variant H2A.Z at the GI locus. Together, our findings suggest that thermal release of a negative feedback loop finely adjusts plant thermomorphogenesis.

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