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

• DOI: 10.1016/j.xplc.2024.100833
• Publication Date: 2024-02-07T02:13:31Z
• Authors: Hui Li; Mande Xue; Huairen Zhang; Fengyue Zhao; Xiaoyi Li; Shuancang Yu; Danhua Jiang
• Keywords: Transcription; Phytochrome; Positive feedback

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 temperature-induced TOC1. Genetic analyses suggest GI prevents excessive inhibiting PIF4, with this regulatory mechanism being partially reliant on repressed ELF3 HY5, concurrently inhibit PIF4 expression activity. Temperature elevation causes deactivation or degradation leading to activation relief transcriptional repression at temperatures. This allows further activate in response elevated turn, inhibits establishing negative feedback loop fine-tunes addition, demonstrate ELF3, regulate modulating enrichment histone variant H2A.Z locus. Together, our findings thermal release finely adjusts plant thermomorphogenesis.