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

作　　者：Hui Li Mande Xue Huairen Zhang Fengyue Zhao Xiaoyi Li Shuancang Yu Danhua Jiang 

机构地区：[1]Key Laboratory of Seed Innovation,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Beijing,China [2]University of Chinese Academy of Sciences,Beijing,China [3]Beijing Vegetable Research Center,Beijing Academy of Agriculture and Forestry Sciences(BAAFS),Beijing,China [4]National Center for Soybean Improvement,State Key Laboratory of Crop Genetics and Germplasm Enhancement,College of Agriculture,Nanjing Agricultural University,Nanjing,China

出　　处：《Plant Communications》2024年第5期208-224,共17页植物通讯（英文）

基　　金：supported by the National Natural Science Foundation of China (32150610472);the National Key R&D Program of China (2019YFA0903903).

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 be-ing 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,es-tablishing a negative feedback loop thatfine-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 lo-cus.Together,ourfindings suggest that thermal release of a negative feedback loopfinely adjusts plant thermomorphogenesis.

关 键 词：TEMPERATURE thermomorphogenesis PIF4 GI TOC1 feedback loop 

分 类 号：Q94[生物学—植物学]