杂交水稻苗瘟抗性的配合力和遗传力分析

Analysis of Combining Ability and Inheritability of Resistance to Leaf Blast during Seedling Stage of Hybrid Rice

采用7×7不完全双列杂交设计，对反映杂交水稻苗瘟抗性的5个指标进行了配合力和遗传力分析．结果表明，杂交水稻苗瘟抗性遗传力高，受加性和非加性基因效应共同控制，但以加性效应为主；恢复系的苗瘟抗性一般配合力效应明显相对重要于不育系，不育系苗瘟抗性一般配合力效应对F1代的抗性有显著的影响；14个供试亲本中，多恢1号、成恢149、K42A、K40A具有较好的苗瘟抗性一般配合力效应．因此，在杂交水稻抗苗瘟育种中，对恢复系的抗性GCA选择和对亲本的抗性GCA评鉴至关重要，但不应忽视不育系对组合的抗性贡献和对组合的抗性评鉴；多恢1号、成恢149、K42A和K40A可作为优良抗苗瘟亲本加以利用．

Analysis of the combining ability and the inheritability of 5 indexes of resistance to leaf blast during seedling stage of hybrid rice was conducted with a set of 7 × 7 incomplete diallel crosses. The results as follow:(1) The resistance, which had a great inheritabillty, was controlled by both addltive heredity and non-additive heredity,but the former was more important than the later.(2) Restorer's GCA was more important than CMS line's,but the later had slgnificant effect on the resistance of its crosses. (3) K42A、 K40A、 Duohui No.l and Chenghui 149 had better GCA of resistance to leaf blast than the other tested parents.So in the hybrid rice breeding forresistance to leaf blast, the evaluation of parent's GCA and the selection of restorer with great GCA were very important, but the assession of crosses' resistance and CMS line's controbution toits crosses shouldn't be ignored, and 2 CMS lines(K42A、 K40A) and 2 restorers (Duohui No.l、Chenghui 149) should be utilized as fine parents.