早稻品种对水稻纹枯病的抗性评比

Comparison of Resistance to Rice Sheath Blight Caused by Rhizoctonia solani in Early Rice Cultivars

在湖北省公安县、湖南省华容县、江西省瑞昌市对 17个早稻品种进行了抗感纹枯病的性能评比 ,结果表明 :嘉育 948(病指 7.86 )、中辐 95 5 (15 .99)在湖北公安表现出较好的抗性 ;浙辐 910 (13.3)、中组 1号 (15 .7)、HB14(15 .8)、中辐 95 5 (16 .0 3)、9818(16 .5 )在江西瑞昌表现出较好抗性。鉴于中组 1号、9818、988在瑞昌表现抗病 (平均病指 17.37) ,在公安表现为感病 (平均病指 34.94) ,而 944和浙 92 48在瑞昌表现为感病 (平均病指41.0 0 ) ,在公安表现为抗病 (均病指 19.6 8) ,说明稻纹枯病菌的群体致病力存在显著地域性差异。

The resistance to Rice Sheath Blight caused by Rhizoctonia solani in 17 early rice cultivars were compared in the experimental plots in Gong'an of Hubei Province,Huarong of Hunan Province and Ruizhong. of Jiangxi Province. The results showed that Jiayu 948 [IOD (index of the disease) 7.86], Zhefu 910 (13.30), Zhongfu 955(15.99) showed much more higher resistance in Gong'an of Hubei Province and Zhefu 910(13.30), Zhongzu 1( 15.70 ),HB14(15.80),Zhongfu 955(16.03) and 9818(16.50) showed much more higher resistance in Ruichang of Jiangxi Province than others in their tested plots.In the view of the fact that Zhongzu1, 9818 and 988 manifested a better resistance to RSB (the mean of IOD was 17.37) in Ruichang but a higher sensitivity in Gong'an (the mean of IOD was 34.96), while 944 and 9248 manifested a higher sensitivity in Ruichang (the mean of IOD was 41.00) but a better resistance in Gong'an (the mean of IOD was 19.68), Which indicated that there were notably regional differentiations in the virulence of natural groups of Rhizoctonia solani causing RSB.