Abstract: A two year field test of inoculation for introduced resources of resistance to rice sheath blight was done on the experimental farm of Yangzhou University from 1996 to 1997. The other characters of the resources were investigated in 1998. Highly significant differences in sheath blight resistance level were showed among the resources and between them and susceptible check. The interaction of variety×year was not significant. Correlation coefficients between resistance and plant height (including characters related to plant type), and between resistance and heading date were also not significant. The results indicated that resistance to sheath blight was a really inheritable character. Most of the sources had the same expression of resistance both in China and the United States. Furthermore, most of them were semidwarf varieties or even extended cultivars, which possessed good agronomic and economic characters. Rice breeders may prefer using them to traditional resources of resistance.

Key words: rice, sheath blight, resistance resource, agronomic character, correlationship

摘要： 对引自美国的水稻纹枯病抗源进行了2 年的田间接种试验和1 年的田间性状考察。结果显示, 抗源与感病对照以及抗源间, 在抗性水平上存在极显著的差异, 且品种与年份间的互作不显著, 抗性与株型性状及生育期的相关也不显著, 表明抗性是一个真实存在的遗传性状。多数抗源在中美两地的抗性表现大体一致, 且多数引进抗源为半矮秆品种(系) 或推广品种, 具有较好的农艺性状和经济性状, 较易为育种家所利用。

关键词: 水稻, 纹枯病, 抗源, 农艺性状