黄淮海稻区水稻品种的穗颈瘟抗性

目的]为明确黄淮海稻区育成水稻品种的稻瘟病抗性及其基因型,方法]收集了来自本稻区5个不同地区的水稻品种,连续两年通过稻瘟病菌接种鉴定和田间病圃自然诱发对供试品种进行了稻瘟病抗性鉴定,并利用4个抗病基因Pita, Pib, Pi54和Pikm的分子标记,对水稻品种基因型进行了统计分析,并以抗性等级为表型值对品种资源进行聚类分析。结果]黄淮海稻区水稻品种发病率较高,分别达 85.2%和 65.9%。Pi54和Pib检出率分别达 84%、65%。同时抗性聚类分析表明Pi54和Pib在本稻区的抗性贡献率却很低。结论]黄淮海稻区水稻品种稻瘟病抗性弱,携带的抗瘟基因的抗性在不断减弱或丧失,需加强稻瘟病主效抗性的发掘、开发与利用。

Genetic Analysis of Rice Neck Blast Resistance in Huang-Huai-Hai Region

【Objective】 To identify the rice blast resistance and the genotype of rice varieties in Huang-Huai-Hai Region, 【Method】the rice blast resistance of the rice varieties collected from five districts of this region was identified for two consecutive years through artificial injection and natural induction in rice blast nursery. The genotypes were analyzed with the functional markers of Pita, Pib, Pi54 and Pikm. And the cluster analysis was carried out according to the rice blast resistance level. 【Result】 85.2% and 65.9% of the tested varieties were sensitive to rice blast through artificial identification and the blast nursery identification, respectively. 84% and 65% of the tested varieties carry Pi54 and Pib, respectively. But the cluster analysis result showed that Pi54 and Pib have low contribution rate of rice blast resistance in this region.【Conclusion】 The rice varieties in the region have low resistance to rice blast, as these genes confer weaker or lost resistance to rice blast. It is crucial to screen new resistant varieties and utilize new resistant genes for breeding.