Construction of inducing disease resistance by Heteroconium chaetospira

毛螺异孢菌诱导抗病的构建

基本信息

批准号：
14360025
负责人：
HASHIBA Teruyoshi
金额：
$ 9.54万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

Root endophytic fungus Heteroconium chaetospiura is known to induce strong antagonistic responses in host plants and the phenomenon can be applied to provide resistance to different species of plants and pathogens. We found that, when used as a preinoculum, H.chaetospira suppressed the incidence of clubroot and Verticillium yellows when test plants were post-inoculated with the causal agents of these diseases.Furthermore, colonization of roots by H.chaetospira could induce systemic resistance in Chinese cabbage and reduce the incidence of bacterial leaf spot and Alternaria leaf spot. H.chaetospira penetrates through the outer epidermal cells of its host, passes into the inner conxtex, and grows throughout the cortical cells, including those of the root tip region. H.chaetospira can grow and persist for long periods and may be less affected by microbial interactions outside the root then other biocontrol agents. Basic environmental conditions, including temperature, moisture, sunlight, and soil physical and chemical characteristics, can greatly affect the physiology of the host plant and subsequent disease development, as well as alter interactions among the plant, pathogen, and biocontrol agents in various ways. H.chaetospira is an effective bioconrol agent against clubroot in Chainese cabbage at low to moderate soil moisture range and a pathogen resting spore density of 10 resting spores per gram of soil in situ.

众所周知，根部内生真菌杂种Chaetospiura在宿主植物中诱导强烈的拮抗反应，并且该现象可用于对不同种类的植物和病原体提供抗性。 We found that, when used as a preinoculum, H.chaetospira suppressed the incidence of clubroot and Verticillium yellows when test plants were post-inoculated with the causal agents of these diseases.Furthermore, colonization of roots by H.chaetospira could induce systemic resistance in Chinese cabbage and reduce the incidence of bacterial leaf spot and Alternaria leaf spot. H. chaetospira穿过宿主的表皮外细胞，进入内部串联，并在整个皮质细胞中生长，包括根尖端区域的细胞。 H.Chaetospira可以长期生长和持续存在，并且与根以外的微生物相互作用的影响少于其他生物防治剂。基本的环境条件，包括温度，水分，阳光以及土壤物理和化学特征，可以极大地影响宿主植物的生理和随后的疾病发展，并以各种方式改变植物，病原体和生物控制剂之间的相互作用。 H.Chaetospira是一种在低至中等土壤湿度范围内的链球卷心菜中针对Clubroot的有效杀菌剂，并且每克土壤原位的病原体静孢子密度为10个静息孢子。