万寿菊杀菌素Ⅰ抗菌性及其对西瓜枯萎病菌作用机理的初步研究

西瓜枯萎病又称萎蔫病或蔓割病,是一种世界性瓜类土传病害。自1894年在美国南卡罗来纳州首次发现以来,目前几乎发生于世界各个西瓜产区,严重威胁着西瓜的安全生产,是西瓜的主要病害之一1]。近几年来,由于西瓜种植面积不断扩大,造成轮作困难,致使枯萎病的危害也逐年加

Antifungal activity of marigold fungicide I and its mechanism on Fusarium oxysporum f. sp. niveum

Marigold fungicide I was studied about the antifungal activity on several pathogenic fungi and the mechanism against Fusarium oxysporum f.sp.niveum(FON),synthetic analogue of extracts of Tagetes patula root.The results showed that marigold fungicide I remarkably inhibited the mycelial growth of several pathogenic fungi,which possessed the content and time effects on Fusarium oxysporum schlecht.f.sp.niveum,Phytophthpra capsici Loen,Botrytis cinerea Pers.and Fulvia fulva(Cookee) Ciferri,threshold effects on Fusarium oxysporum f.sp.capsici and Gibberella zeae(Schw.)Petch and content effects on Glomerella gossypii(Southw.)Edgertin.Marigold fungicide I was applied on FON and manifested the following findings: reduced the dry weight of mycelium,amplified membrane permeability,shortly increased chitinase activity,but no change of POD isozyme.The electrophoresis of total protein by SDS-PAGE showed that marigold fungicide I apparently affected the species and expression amounts of protein of FON.