中国部分杂交稻和常规早籼、晚粳品种(系)的抗瘟性

 选用来自中国18个省、市,12个小种分属于9个不同谱系的30个具有广谱毒性的稻瘟病菌株,人工接种于已知抗瘟基因型的品种(系)及中国20世纪90年代新育成的部分杂交稻和常规早籼、晚粳品种上进行水稻抗病性鉴定。通过具有广谱毒性并能识别抗病基因的30个菌株,与具有不同抗性类型并携带有不同或与之相连锁的抗性基因的品种及已知抗性基因的国际鉴别品种进行比较,以期推测某些中国品种的抗性基因。结果表明,部分优异抗瘟材料及新育成的杂交稻组合和常规早籼、晚粳稻品种(系)能抗多数近年采集分离的田间致病菌株,是育种和大面积推广种植

Evaluation of Resistance of Some Hybrid Rices, Conventional Early Indica and Late Japonica Rice to Magnaporthe grisea in China

Thirty isolates of Magnaporthe grisea collected from 18 provinces/cities of China representing 12 pathotypesand 9 different lineages were chosen for pathogenicity test with artificial inoculation on some rice varieties with knownresistance genes, of hybrid rice, and conventional early indica and late japonica varieties cultivated in China since the1990's. Virulence spectrum of the 30 isolates tested was very different, showing that they recognize numerous differentresistance genes. Varieties also revealed very different resistance patterns showing that they carry different resistancegenes or combinations of resistance genes. On the basis of comparisons with international differential varieties with knownresistance genes, the presence of these resistance genes in certain Chinese varieties could be speculated. The resultsindicated that some varieties were resistant to most of the isolates tested and that they could be of interest as resistancesources for hybrid parents or to be planted in the field directly.