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TOPLESS promotes plant immunity by repressing auxin signaling and is targeted by the fungal effector Naked1

Plant Communications 2022年第2期3卷 92-111页

作者： Fernando Navarrete Michelle Gallei Aleksandra EKornienko indira saado Mamoona Khan Khong-Sam Chia Martin A.Darino Janos Bindics Armin Djamei Gregor Mendel Institute(GMI) Austrian Academy of Sciences(OEAW)Vienna BioCenter(VBC)Dr.Bohr-Gasse 31030 ViennaAustria Leibniz Institute of Plant Genetics and Crop Plant Research(IPK) OT GaterslebenCorrensstraße 306466 Stadt SeelandGermany Present address:Institute of Science and Technology Austria Am Campus 13400 KlosterneuburgAustria Present address:Institute of Molecular Biotechnology Dr.Bohr-Gasse 31030 ViennaAustria Present address:Institute of Crop Science and Resource Conservation University of BonnBonnGermany

In plants,the antagonism between growth and defense is hardwired by hormonal *** perception of pathogen-associatedmolecularpatterns(PAMPs)frominvadingmicroorganismsinhibits auxin signalingand plant ***,pathogens manipulate auxin signaling to promote disease,but how this hormone inhibits immunity is not fully *** maydis is a maize pathogen that induces auxin signaling in its *** characterized a *** effector protein,Naked1(Nkd1),that is translocated into the host *** its native ethylene-responsive element binding factor-associated amphiphilic repression(EAR)motif,Nkd1 binds to the transcriptional co-repressors TOPLESS/TOPLESS-related(TPL/TPRs)and prevents the recruitment of a transcriptional repressor involved in hormonal signaling,leading to the derepression of auxin and jasmonate signaling and thereby promoting susceptibility to(hemi)biotrophic pathogens.A moderate upregulation of auxin signaling inhibits the PAMP-triggered reactive oxygen species(ROS)burst,an early defense ***,our findings establish a clear mechanism for auxin-induced pathogen *** Nkd1 variants with increased expression or increased EAR-mediated TPL/TPR binding trigger typical salicylic-acid-mediated defense reactions,leading to pathogen *** implies that moderate binding of Nkd1 to TPL is a result of a balancing evolutionary selection process to enable TPL manipulation while avoiding host recognition.

关键词： topless auxin pattern-triggered immunity PTI effector maize Ustilago maydis

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