湖南推广杂交稻品种的稻瘟病抗性评价及不同评价指标的相关性分析

Evaluation on Blast Resistance of Widely-used Hybrid Rice Varieties in Hunan and Correlation among Different Evaluating Indexes

2012年收集湖南推广种植的92个杂交稻品种,在湖南桃江稻瘟病鉴定中心病圃鉴定了它们的稻瘟病抗性。结果表明,供试92个杂交稻品种依据抗性综合指数评价,表现抗病(中抗至高抗)的品种有43个,感病的品种有49个;相关性分析表明,苗叶瘟病情指数、穗颈瘟病情指数、穗颈瘟损失指数和抗性综合指数这4个指标相互间均呈极显著正相关,可以通过苗叶瘟来初步判断品种的抗瘟性及预防穗颈瘟的发生。

92 hybrid rice varieties collected from the widelyused rice cukivars in commercial production in Hunan Province in 2012 were evaluated on their resistance to rice blast in the disease nursery of the Rice Blast Identification Center at Taojiang, Hunan. The results showed that, among 92 tested varieties, 43 were resistant （ MR to HR） and 49 susceptible （ MS to HS） based on the scales and evaluation of resistance composite index. The corre lation analysis showed that there was a very significant （at 1% level） positive correlation among all 4 indexes inclu ding disease index of leaf blast, disease index of panicle blast, yield loss index of panicle blast and resistance com posite index. It is concluded that the blast resistance of a hybrid rice variety could be primarily judged by its resist ance of leaf blast in seedling stage, and its panicle blast could be prevented and controlled according to its inci dence of leaf blast.