The AMS/DYT1-MYB module interacts with the MED25-MYC-MYB complexes to inhibit jasmonateregulated floral defense in Arabidopsis  

作　　者：Junqiao Song Shihai Pang Bingjie Xue Deqing Rong Tiancong Qi Huang Huang Susheng Song 

机构地区：[1]College of Life Sciences,Capital Normal University,Beijing 100048,China [2]School of Life Sciences,Tsinghua University,Beijing 100084,China [3]Plant Science and Technology College,Beijing University of Agriculture,Beijing 102206,China

出　　处：《Journal of Integrative Plant Biology》2025年第2期408-422,共15页植物学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(32270765)。

摘　　要：The phytohormone jasmonates(JAs)regulate plant growth and defense responses.The reproductive organs of flowers are devastated by insect herbivores.However,the molecular mechanisms of floral defense remain largely unknown.Here,we found that the Arabidopsis JA receptor CORONATINE INSENSITIVE1(COI1)and its substrates JA ZIMdomain(JAZ)repressors,and the mediator subunit MEDIATOR25-based MED25-MYC-MYB(MMM)complexes,including MYC2/3/4/5 and MYB28/29/76,mediated floral defense against the insects Helicoverpa armigera,Spodoptera exigua,and Spodoptera frugiperda.The flower-specific IIIa b HLH factors ABORTED MICROSPORES(AMS)and DYSFUNCTIONAL TAPETUM 1(DYT1)were JAZ-interaction proteins.They interacted with members of the MMM complexes,inhibited the transcriptional activity of MYC2 and MYB28,and repressed floral defense against insects.AMS and DYT1 recruited the flower-specific MYB21/24,and these MYBs interacted with members of MMM complexes,inhibited the MYC2-MYB28 function,and suppressed floral defense against insects.Our study revealed that the JA-COI1-JAZ-MMM pathway mediated flower defense,and the AMS/DYT1-MYB21/24 module antagonized the MMM complexes to repress floral defense against insects.

关 键 词：floral defense jasmonate JAZs the AMS/DYT1-MYB module the MED25-MYC-MYB complexes 

分 类 号：G63[文化科学—教育学]