番茄根结线虫病抗性基因的研究进展

Research progress in genes controlling root-knot nematode disease on tomato

已发现的番茄根结线虫病的抗病基因有9个,命名为Mi-1、Mi-2、……Mi-9。其中,只有Mi-1基因被克隆,并且成功转育到栽培番茄材料中,在番茄抗根结线虫病方面发挥了重大作用。但是该基因在土壤温度高于28℃时就会丧失抗性,而且突破Mi-1基因抗性的线虫群体也对番茄造成了威胁,而有些番茄抗根结线虫的基因可以较好地弥补Mi-1基因的不足,选育含有这些抗病基因的番茄材料十分必要。此外,对于Mi-1基因作用机理方面的研究也取得了很多成果。本文主要介绍番茄根结线虫抗病基因及其作用原理方面所取得的研究进展。

There are 9 genes controlling root-knot nematode disease on tomato,named Mi-1,Mi-2,…Mi-9.But only one gene,Mi-1,has been cloned and transferred into cultivated tomatoes successfully,playing an important role in the root-knot nematode disease control of cultivated tomatoes.However,this gene becomes inactive when soil temperature is above 28 ℃,and tomato has been threatened by the nematode population who lost sensitivity to the Mi-1 gene resistance.Since these shortages can be patched by other resistance genes in tomato,breeding of new tomato lines with novel resistance genes is necessary.In this paper,the research progress in genes controlling root-knot nematode disease and their mechanisms were reviewed.