WRKY2 and WRKY10 regulate the circadian expression of PIF4 during the day through interactions with CCA1/LHY and phyB  

作　　者：Shulei Wang Qingbin Sun Min Zhang Chengzhu Yin Min Ni 

机构地区：[1]National Key Laboratory of Crop Biology,College of Life Sciences,Shandong Agricultural University,Taian 271018,China [2]Department of Plant and Microbial Biology,University of Minnesota at Twin Cities,Saint Paul,MN 55108,USA

出　　处：《Plant Communications》2022年第2期121-137,共17页植物通讯（英文）

基　　金：This work was supported by Shandong Agricultural University,China,SDA-2014.

摘　　要：WRKY transcription factors are known mostly for their function in plant defense,abiotic stress responses,senescence,seed germination,and development of the pollen,embryo,and seed.Here,we report the regulatory functions of two WRKY proteins in photomorphogenesis and PIF4 expression.PIF4 is a critical signaling hub in light,temperature,and hormonal signaling pathways.Either its expression or its accumulation peaks in the morning and afternoon.WRKY2 and WRKY10 form heterodimers and recognize their target site in the PIF4 promoter near the MYB element that is bound by CCA1 and LHY under red and blue light.WRKY2 and WRKY10 interact directly with CCA1/LHY to enhance their targeting but interact indirectly with SHB1.The two WRKY proteins also interact with phyB,and their interaction enhances the targeting of CCA1 and LHY to the PIF4 promoter.SHB1 associates with theWRKY2 andWRKY10 loci and enhances their expression in parallel with the PIF4 expression peaks.This forward regulatory loop further sustains the accumulation of the two WRKY proteins and the targeting of CCA1/LHY to the PIF4 locus.In summary,interactions of two WRKY proteins with CCA1/LHY and phyB maintain an optimal expression level of PIF4 toward noon and afternoon,which is essential to sketch the circadian pattern of PIF4 expression.

关 键 词：CCA1 LHY light signaling PIF4 expression WRKY2 WRKY10 

分 类 号：Q94[生物学—植物学]