INTERFERENCE BY NON-HOST PLANT ROOTS AND ROOT EXUDATES IN THE INFECTION PROCESSES OF PHYTOPHTHORA NICOTIANAE  

作　　者：Yuxin YANG He ZHANG Yuting FANG Ying LI Xinyue MEI Huichuan HUANG Fei DU Shusheng ZHU Min YANG Yixiang LIU 

机构地区：[1]State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan,Yunnan Agricultural University,Kunming 650201,China [2]Key Laboratory for Agro-Biodiversity and Pest Control(Ministry of Education),College of Plant Protection,Yunnan Agricultural University,Kunming 650201,China [3]Key Laboratory of Pest Monitoring and Green Management(Ministry of Agriculture and Rural Affairs of China),College of Plant Protection,China Agricultural University,Beijing 100193,China

出　　处：《Frontiers of Agricultural Science and Engineering》2021年第3期447-459,共13页农业科学与工程前沿（英文版）

基　　金：This study was supported by the National Natural Science Foundation of China(31972328,31601682);the Natural Science Foundation of Yunnan Province(2018FG001-046);the Major Program in Yunnan Province(202002AE320012-02-03);the key Yunnan provincial programs of Yunnan Eco-Friendly Food International Cooperation Research Center(2019ZG00901-03);the Yunnan Academician Workstation of Chinese Academy of Engineering(2018IC063);the Program for Innovative Research Team in Science and Technology in University of Yunnan Province.

摘　　要：Crop rotations are widely used because they can significantly reduce the incidence of pests and diseases.The interactions between non-host roots and pathogens may be key in the inhibition of soilborne pathogens in crop rotations.Interactions between fennel(Foeniculum vulgare)roots/root exudates and Phytophthora nicotianae were investigated because of the known allelopathy between fennel and tobacco(Nicotiana tabacum).The effects of the key compounds in the fennel rhizosphere on the mycelial growth and zoospore behavior of P.nicotianae were assessed.The roots of fennel attracted P.nicotianae zoospores and inhibited their motility and the germination of cystospores,with some cystospores rupturing.4-ethylacetophenone,vanillin and N-formylpiperidine were consistently identified in the fennel rhizosphere and were found to interfere with the infection of P.nicotianae,especially vanillin.Hyphae treated with these compounds produced more abnormal branches and accumulated reactive oxygen species.These interspecific interactions between non-host roots and pathogens were found to be an important factor in the inhibition by fennel of infection by P.nicotianae.

关 键 词：fennel and tobacco rotation infection behavior Phytophthora nicotianae reactive oxygen species VANILLIN 

分 类 号：S435.72[农业科学—农业昆虫与害虫防治] S573.9[农业科学—植物保护]