根据杂种优势值划分粳型水稻杂种优势生态型

Study on Heterotic Ecotypes of Japonica Rice Based on the Heterosis

利用9个不同生态类型的50份水稻亲本材料,以生态型为单位进行双列杂交,配制杂交组合.研究杂种一代的对照优势和超亲优势.以杂种优势值作为划分优势生态型的依据.结果表明:西北粳、台湾粳、日本粳和韩国稻为优势生态类型.根据各生态型间的杂种优势值可以推测台湾粳、日本粳和韩国粳具有穗数上的优势基因,西北粳具有粒数上的优势基因,非洲IRAT粳具有粒重上的优势基因.最佳优势组配模式为韩国粳×日本粳、西北粳×美国粳和台湾粳×日本粳.杂种优势与亲本形态指数差异的相关分析表明,各生态型间形态指数差异与其F1杂种优势相关不显著.表明依据亲本形态差异不能预测杂种优势.

The heterotic ecotypes were studies by analysis of heterosis of the F_1 hybrids which were created in a diallel set of cross between 9 ecological types.The heterotic patters of japonica rice were also established.The result indicated that Japonica ecotype of North-China,Taiwan,Japanese and Korea rice were considered as heterotic ecotypes in this study.The heterotic patterns in this study were Japonica ecotype of Korea×Japanese Japonica ecotype,Japonica ecotype of Northwest × American rice and Taiwan japonica rice × Japonica varieties of Japanese.It was suggested that Northwest Japonica varieties exist heterotic genes of number of grains,and Taiwan japonica varieties,Japanese japonica varieties and Korean japonica varieties exist heterotic genes of number of panicle,and IRAT varieties have heterotic gene of grain weight.It was also found that the correlation coefficient between heterosis and the divergence of parents in morphological traits were not significant different.