7个玉米合成群体选系的杂优类群分析

Analysis on Heterotic Group of Inbred Lines from 7 Synthetic Maize Populations

以7个玉米人工合成群体的21个新选自交系和西南地区常用的6个骨干玉米自交系以及代表我国玉米核心种质的S37、黄早四、丹598和478四个标准测验种为材料,利用SSR标记,进行了杂优类群划分,以21个新选系和6个常用骨干系按不完全双列杂交组配的126个杂交组合为材料,通过单株产量测定、杂种优势估算,分析了杂优模式。结果表明:31个自交系间遗传相似系数变幅为0.520～0.808,以相似系数0.655为阈值,可将31个自交系划分为5个大类群,其中第Ⅲ类群又可分为3个亚群;7个玉米人工合成群体的21个新选系有6个划入热带种质,2个划入Lancaster群,3个划入四平头群,1个划入Reid群,9个划入其他类群;在各类群组配中,热带种质群分别与Reid群、Lancaster群和旅大红骨群组配可产生较强的杂种优势;部份群体选系聚类出现交叉的原因可能是由于具有相同的遗传背景所致。

In this article,the materials were 21 new inbred lines derived from 7 synthesized maize populations,6 elite inbred lines in southwest regions and 4 temperate inbred lines including S37,Huangzaosi,Dan598,and Ye478.Study their heterotic groups by SSR markers.Use 126 combinations which were crossed with 21 new maize inbred lines and the 6 tester by the incomplete dialel cross design as materials study heterotic patterns.The results showed that：genetic similarity coefficients among the 31 inbred lines ranged from 0.520-0.808,the 31 inbred line were divided into 5 groups,and the group 3 can be divided into three sub-groups;21 new inbred lines had 6 been assigned to tropical germplasm,2 been assigned to Lancaster group,3 been assigned to Tangsipingtou,1been designated Reid group,9 been classified other group;The tropical germplasm group cross respectively with Reid Group,Lancaster group and Luda Red Cob group can produce strong heterosis in various combinations.Part of the newly selected lines crossed in the dendrogram by cluster analysis for 31 inbred based on SSR data,which indicated that they have same genetic background partly.