17个玉米地方种质选系的育种潜势分析

以西南地区生产上常用的11个玉米骨干自交系为测验种，采用不完全双列杂交设计，测定17个玉米地方种质新选自交系主要性状的配合力和杂种优势，并对杂优类群、性状遗传参数进行分析。结果表明，单株产量GCA表现突出，且构成产量因子性状GCA表现也较好的新选系有P1-1、P1-16和P1-14；SCA值高、杂种优势强的组合是P1-10×P2-4，四平头群×Lancaster群在川南地区可产生较强的杂种优势；在穗行数、行粒数等4个性状中，亲本的基因加性效应对F1性状形成起主导作用，可早代进行选择，而百粒生、单株产量等5个性状的遗传变异主要来自于基因非加性效应，宜晚代进行选择。

Analysis on Breeding Potential of 17 Maize Inbred Lines from landraces

The primary objective of this study was to estimate combining ability and its genetic parameters of as et of 17 newly inbred lines.The materials included 11 testers,which used commonly in southwest regions,17n ewly inbred lines obtained from landraces maize germplasms,and 187（11×17）combinations which werec rossed with 17 new maize inbred lines and the 11 testers by NC II mating design.The combining ability of 17i nbred lines was analyzed based on the date for the experiment.The genetic parameters and heterotic groupw ere done basing on combining ability.The results showed that P1-1,P1-16 and P1-14 with the betterc omprehensive characters could be directly used in maize breeding program.The SCA of P1-10×P2-4 wash igh in most traits,it brought out strong heterosis.It was more possible to obtain high field hybrid combinationsb y the pattern Sipingtou×Lancaster.GCA variance was bigger than SCA variance in rows per ear,kernels perr ow etc four characters,they were affected by the environments slightly and should be selected at earlyg enerations,yet SCA variance of 100-kernel weight and plant weight etc five characters was bigger than GCAv ariance,they were accessible to the environment,so they were not to be selected in early generations.