不同稻区稻瘟病菌致病型变异及基于MAS的品种对稻瘟病的抗性鉴定

Pathotypes of Magnaporthe oryzae in different rice regions and the blast resistance identification of cultivars by MAS

稻瘟病是影响水稻生产的重要病害。监测田间稻瘟病菌菌群致病型的组成是有效推行利用抗病品种抗瘟策略的必须环节。本研究采集2015年湖北省10个稻作区的穗颈瘟标本,以单基因鉴别品系对分离得到的菌群进行致病型的测定,并分区进行品种的抗瘟性鉴定,结果表明,不同稻作区菌群致病型的组成存在差异,品种对不同稻作区菌群的抗性明显不同,单基因品系中9个抗性基因在湖北稻区受侵染程度也存在明显差异。

Rice blast is an important disease which influences rice production. The field monitoring on the configuration of rice blast pathotypes is essentially needed for effective disease controlling by growing resistant varieties. In the present study, blast panicle specimens were collected from 10 rice areas in Hubei province in 2015. The pathogenicity of each single spore strain was determined on a series of single-gene differential lines. Also, blast resistances of 25 rice cultivars were identified by inoculating with spore solution from l0 rice regions. The results showed that the pathotypic structure from different rice regions was diverse, and the resistances of 25 cultivars were significantly different. The infection degrees of the 9 resistance genes among singlegene lines in Hubei were also different.