根据产量特殊配合力分析玉米自交系杂种优势群

Study on Heterotic Groups Among Maize Inbred Lines Based on SCA

采用NCII设计 ,以Mo17、B73、黄早四、丹 340、K12、K2 2为测验种 ,12个自交系为被测系 ,通过两年、两点完全区组试验设计 ,分析了 18个玉米自交系的配合力和杂种优势群。结果表明 ,18个自交系可分为 5群 ,即兰卡斯特 (Mo17和P138)、瑞得 (B73、8112、铁 792 2和掖 10 7)、四平头 (黄早四、K12和 5 15 )、旅大红骨 (丹 340、E2 8、自 330、S37和 8 93)和PA群 (K2 2、CA15 6、掖 4 78和沈 5 0 0 3)。在 72个杂交组合中 ,K12× 8 93、B73×S37、B73× 8 93、K2 2×S37、Mo17× 8 93、Mo17×S37、丹 340×铁 792 2、丹 340×P138、丹 340×S37为 9个强优势组合。K12、S37、8 93和丹340的产量一般配合力高 ,参与组配的强优势组合较多。因此 ,这 4个自交系及其衍生系在我国玉米育种和生产中会有较大的应用潜力。

The combining ability and heterotic groups of 18 maize inbred lines used predominantly in China were analyzed based on the data from 2 year and 2 location experiments. Design II and testers of Mo17, B73, Huangzao4, Dan340, K12, K22 were adopted. The results indicated that 18 inbred lines were classified into 5 heterotic groups, i.e. Lancaster (Mo17 and P138), Reid (B73, 8112, Tie7922 and Ye107), Sipingtou (Huangzao4, K12 and 515), Lüda Red Cob ( Dan340, E28, Zi330 and 8 93) and PA group (K22, CA156, Ye478 and Shen5003). The combinations of K12×8 93, B73×S37, B73×8 93, K22×S37, Mo17×8 93, Mo17×S37, Dan340×Tie7922, Dan340×P138 and Dan340×S37 performed best among 72 entries. Inbred lines K12, S37, 8 93 and Dan340 were good combiners and are involved to produce high yielding hybrids. They will be the predominant lines in maize breeding and commercial production in China.