A tug-of-war to control plant emission of an airborne alarm signal  

作　　者：Jie Hao Junfei Ma Hua Shi Ying Wang 

机构地区：[1]Plant Pathology Department,University of Florida,Gainesville 32611,USA [2]State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan,Yunnan Agricultural University,Kunming 650201,China

出　　处：《Stress Biology》2023年第1期526-529,共4页逆境生物学（英文）

基　　金：supported by the US National Science Foundation(MCB-1906060 and MCB-2145967 to Y.W.)。

摘　　要：Aphids represent a major threat to crops.Hundreds of different viruses are aphid-borne.Upon aphid attack,plants release volatile organic compounds(VOCs)as airborne alarm signals to turn on the airborne defense(AD)of neighboring plants,thereby repelling aphids as well as reducing aphid fitness and virus transmission.This phenomenon provides a critical community-wide plant protection to fend off aphids,but the underlying molecular basis remains undetermined for a long time.In a recent article,Gong et al.established the NAC2-SAMT1 module as the core component regulating the emission of methyl-salicylate(MeSA),a major component of VOCs in aphid-attacked plants.Furthermore,they showed that SABP2 protein is critical for the perception of volatile MeSA signal by converting MeSA to Salicylic Acid(SA),which is the cue to elicit AD against aphids at the community level.Moreover,they showed that multiple viruses use a conserved glycine residue in the ATP-dependent helicase domain in viral proteins to shuttle NAC2 from the nucleus to the cytoplasm for degradation,leading to the attenuation of MeSA emission and AD.These findings illuminate the functional roles of key regulators in the complex MeSA-mediated airborne defense process and a counter-defense mechanism used by viruses,which has profound significance in advancing the knowledge of plant-pathogen interactions as well as providing potential targets for gene editing-based crop breeding.

关 键 词：Salicylic acid Methyl-salicylate NAC2 SAMT1 SABP2 Airborne defense 

分 类 号：S433[农业科学—农业昆虫与害虫防治]