关于大白菜—软腐欧文氏菌互作的某些新观点  

ADVANCED VIEWS ON HOST-PATTHOGEN INTERACTIONS IN PATHOSYSTEM OF CHINESE CABBAGE SOFT ROT

作　　者：董汉松[1] 吕士恩[1] 杨合同 

机构地区：[1]山东农业大学,泰安271018 [2]山东省生物研究所

出　　处：《山东科学》1993年第2期57-60,共4页Shandong Science

摘　　要：以病菌根系侵入、系统性潜伏侵染为主要环节的病害循环;寄主—病菌接触识别;潜伏侵染和致病或发病状态转变中的寄主—病菌互作;互作的阶段性和专化性等,是近10年来对大白菜软腐病重新研究和认识的主要观点。这些观点对探讨和实施病害控制的新途径已产生重要的指导作用。The advancement in the studies on host—pathogen interactions in pathosystem of chinese cabbage soft rot is summarized, with emphasis on new view—points related. The observations on root ivasion and systemically latent infection of the host by Erwinia carotovora subsp, carotovora have led to the establishment of a new model of the disease circulation, and the application of new methods for the disease control in which the prevention from root invasion is fundamental. This also has led to the observations about the host—pathogen interactions at the stage of bacterial adsorption to root surfaces of the plant. The contact recognition between the bacteria and host occurs when the pathogen adsorbs, which is a continuous process of molecular binding followed by cell to cell cohering of pathogen with host. The molecular recognition is completed by the specific binding of the bacterial lipopolysaccharide(LPS) with agglutinin (Agin—SD60) of the plant, which induces the cell recognition showed by the specific adsorption of the pathogen to the plant root. The study advancement has also been obtained on the physiological adn biochemical mechanisms of pathogenesis, which is specialized by the transformation from latent infection to pathogenicity and pathogenesis. During the transformation, the host shows active resistance to pathogenicity, mainly including inhibitory regulation to polygalacturonic acid lyase (PGTL) activity of the bacteria by changing Ca^(2+) contents and PH in vivo, by the existence and content increase of a cell wall protein (CWP) which is able to inhibit PGTL activity of the bacteria, and by the defence from pathogen via changing binary phenyl contents. At the same time of these resistance responses, the host gives some reactions benifitial to the bacterial pathogenicity, including supply of soluble sugars and free amino acids for the pathogen as nitrition sources, and increase of Ca^(2+) release and PH values which are able to enhance the PGTL activity. The theoretical and practical significance we

关 键 词：大白菜 软腐欧文氏菌 互作 软腐病 

分 类 号：S436.341.1[农业科学—农业昆虫与害虫防治]