几个主要玉米自交系的配合力及聚类分析
Combining Ability and Cluster Analysis of Some Maize Inbred Lines
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摘要: 利用16个自交系按8×8不完全双列杂交法配成64个组合,研究其株高、穗位高、生育期、穗长、穗粒数、小区籽粒产量等14个农艺性状的一般配合力(GcA)、特殊配合力(SCA)和遗传参数.结果表明:14个农艺性状的GCA和SCA均达极显著水平;控制这14个性状的基因效应中主要以加性基因效应为主,非加性基因效应较少;本试验材料中561、B603-6-1、8954、4781tl41、268、549、478C4等7个自交系GCA综合性状较优,为组配强优势杂交组合的优良自交系.根据离差平方和法进行聚类分析表明16个自交系划分成6个类群:549、8954为一类;268、478C4、冬4011、N7931、478G为一类;4781tl41、苏11为一类;561、B603-6-1为一类;WJ01、石79、1058为一类;吉1037、200H为一类.
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关键词:
- 玉米,自交系,配合力,聚类分析
Abstract: Sixteen maize inbred lines were used in an 8×8 incomplete diallel cross experiment to form 64cross combinations and their general combining ability(GCA),special combing ability(SCA)and genetic parameters of 14 agronomic traits were recorded,including plant height,ear height,growth duration,ear length,kernels per ear,grain yield per plot.The results showed that the GCA and SCA of all the agronomic traits studied were significantly high and were controlled mainly by additive genes.Considered comprehensively,7 inbred lines(561,B603-6-1,8954,4781tl41,268,549 and 478C4)had relatively good GCA characters and they would be useful in developing the crosses with strong heterosis.Cluster analysis divided the 16 maize inbred lines into 6 groups,i.e.[1]549 and 8954;[2]268,478C4,Dong4011,N7931and 478G;[3]4781tl41 and Sull;[4]561 and B603-6-1;[5]WJ01,Shi79 and 1058;and(6)Ji1037 and200H. -
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