寄主专一性

文中分析了自然界和农田生态系统中天敌的多样性和寄主专一性，并从外来种的治理、濒危物种和栖境的保护等几个方面探讨了生物防治对于保护生物多样性的作用。

It reported briefly the diversity of natural enemies and their host specificity in natural and agricultural ecosystem , and the roles of biological control in management of exotic species as well as conservation of endangered species and habitats .

根瘤菌可在几种豆科植物上成瘤，结瘤基因（nod基因）赋予这些细菌以寄主专一性的方式诱导瘤的形成。

Rhizobia can cause the formation of nitrogen-fixing nodules on the roots of several leguminous plants . The nodulation ( nod ) genes enable bacteria to induce nodule formation in a host-specific manner .

杂草生物防治中天敌昆虫寄主专一性测定及其风险分析

Host - specificity Test for Weed Biological Control Agents and Potential Risk Analysis

另一类是寄主专一性基因，这类基因具有种属或菌株的专一性，它们决定了细菌的寄主范围；

Host-specificity genes , which are strain-or species-specific and determine the bacterial host range ;

但其寄主专一性高、发酵与制剂加工困难等限制了其在生产上的广泛应用。

But the difficulties of fermentation and formulation , the high host-specifity and other problems are limiting its application in production .