中国玉米LSC杂种优势群种质与美国BSSS种质间配合力分析

Analysis of combining ability between chinese LSC heterotic group and US BSSS in Maize

以我国兰卡斯特杂种优势群(LSC群)的5个代表性自交系和选自美国依阿华坚秆综合种(BSSS群体)的4个自交系为材料,对LSC和BSSS种质间的配合力进行了研究。结果表明,不同自交系的一般配合力和特殊配合力存在较大差异。选自BSSS群体的自交系中,B73和B109的一般配合力高于B94和B111;而LSC群的自交系中,4F1A和杂C546的一般配合力高于Mo17、自330和四446A。在BSSS群和LSC群的自交系互为测验种的情况下,不同自交系间的特殊配合力差异很大;其中,以产量特殊配合力效应值为核心的各性状配合力综合指标来说,特殊配合力超过内参对照Mo17×B73的组合占组合总数的35%;一般配合力高的自交系间的特殊配合力均高于其他自交系间的特殊配合力。

Abstract： Five inbreds from Chinese LSC heterotic group and four inbreds BSSS population respectively as materials, the combining ability between the two divergent germplasm was determined. The results showed that the general combining ability （GCA） and specific combi- ning ability （SCA） of diverse inbreds were obviously different. Among the inbreds from BSSS, GCA values of B73 and B109 were greater than those of B94 and Blll, whereas GCA values of 4FIA and ZAC456 were higher than the other inbreds which from Chinese LSC group. When the inbreds from Chinese LSC group and BSSS were used as mutual testers, SCA values between different inbreds were greatly divergent. Among these, under SCA for grain yield as the core assessment index combined with those for other traits, more than 35% of hybrids revealed greater SCA values than the inner control Mo17 × B73 for the hybrids produced by crossing LSC inbreds with BSSS inbreds. And, crossing between high-GCA in- breds could produce elite hybrids with higher SCA values comparing to crossing between low- er-GCA inbreds.