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本试验以美国种质坚杆综合种BSSSC9(B)、Lancaster(Lan)、热带种质墨黄九(M)、亚热带种质苏湾(S)4个国外群体和中国西南种质巫溪(W_(14))、兰花早(L)2个地方群体为主体,掺和含有它们血缘的优良自交系,品种群体,首次合成了WBMCo、WLSCo、LBMCo、LLSCo 4个轮回选择育种基础群体(代号的第一字母为国内西南地区种质,第二个字母为北美种质,第三个字母为热带、亚热带种质),并与6个主体亲本种质群体进行了比较.研究表明,按一定比例,经充分遗传重组组建的4个合成群体,其穗长、穗粗、穗行数、行粒数、百粒重、出籽率等主要产量组成性状的均值和标准差均大于对应亲本种质群体.4个合成群体单株粒重的频率分布向高产方向偏移,变异范围也比亲本群体大.所有群体的穗重对单株粒重的贡献最大.影响单株粒重的其他各因素,其大小和方向,在4个合成群体和对应亲本群体中各不一样.为此,讨论并提出了各群体改良途径和利用价值.
In this study, four foreign populations of the United States, such as BSSSC9 (B), Lancaster (Lan), Triticum aestivum (M), subtropical germplasm Suwan (S) WLC (14) and Lanhuazao (L) were selected as the main populations, and four elite inbred lines (WBMCo, WLSCo, LBMCo and LLSCo) The first letter of the code is the germplasm in southwestern China, the second one is North American germplasm, and the third one is tropical and subtropical germplasm), and compared with the six main parent germplasm populations. The mean and standard deviation of the major yield traits such as ear length, ear diameter, ear number, grain number per line, grain weight per plant, seed yield and other four yield groups were all higher than those of the corresponding parents Germplasm groups.The frequency distribution of grain weight per plant in the four synthetic groups shifted toward higher yield and the variation range was also larger than that of the parental group.The ear weight of all groups had the greatest contribution to grain weight per plant The factors, their size and direction, are among the 4 synthetic and corresponding parental groups Like To this end, various groups to discuss and propose ways to improve and value in use.