Abstract:

As an important resistant gene in tomato, Mi-1  gene shows potential for resistance to Meloidogyne spp., Macrosiphumeuphorbiae and Bemisia tabaci. The principle of such resistance should be attributed to an encoded protein, which is of CC-NBS-LRR structure, being of broad spectrum for resistance towards plant diseases and pests. In this paper, we reviewed its characteristics of insect-resistance; discussed the gene structure and the insect-resistant types of its products; analyzed the genes resistant ability towards Meloidogyne spp., Macrosiphum euphorbiae and Bemisia tabaci; and further studied the resistant mechanisms of Mi-1  by means of gene mutation and salicylic acid pathway. Through objective evaluation on the functional mechanism of plant endogenous Mi-1  gene for plant diseases and pests, this study definitudes the application value of Mi-1  in agricultural production, thus provides scientific reliance for biological resistance control towards plant diseases and pests.

Key words: Mi-1 gene, insect resistance of tomato, root-knot nematode, potato aphid, sweet-potato whitefly

摘要：

Mi-1基因是重要的番茄抗病虫基因,编码蛋白质具有CC-NBS-LRR结构,抗性谱广,可有效防治根结线虫、马铃薯长管蚜和烟粉虱。综述了Mi-1抗性基因的抗虫特点,讨论了Mi-1基因的结构及其产物的抗虫类型,分析了Mi-1抗性基因对根结线虫、马铃薯长管蚜和烟粉虱的抗性功能,并进一步探讨了Mi-1基因通过突变基因和水杨酸等途径对植物病虫害的抗性机制。通过客观评价植物内源Mi-1抗性基因对植物病虫害的作用途径,明确了植物Mi-1抗性基因在农业生产中的应用价值,可为植物病虫害的生物抗性防治提供科学依据。

关键词: Mi-1抗病虫基因；番茄抗虫性；根结线虫；马铃薯长管蚜；烟粉虱