50个常用玉米自交系配合力的聚类分析

Cluster Analysis Method of Combining Abililty in Fifty Main Maize Inbred Lines

对50个玉米自交系,4个测验种中的NC—Ⅱ交配组合进行了试验.以50个自交系的一般配合力及特殊配合力为指标,采用系统聚类法进行聚类分析.结果表明,利用配合力为指标将50个自交系分为13类,这13类在一般配合力和特殊配合力方面各具特点.A类的特点是,与BSSS遗传背景有较高的特殊配合力;B类的特点是,与Syn3和BSSS二种遗传背景均有较高的特殊配合力;C类的特点是,与5003、BSSS二种遗传背景具有较高的特殊配合力,并具较高的一般配合力.因此,认为此法在杂种优势预测及利用方面较通常所用的表型聚类法更可靠实用.

Fifty maize (Zea mays L. ) inbred lines and their crosses mated with fourtesting lines were evaluated in 1989 in Beijing. Classification of the inbred lines was done by using the general combining ability and the specific combining ability. 50 lines were divided into13 groups according to the combining ability. Every group had its own characteristic on the combining ability and the specific combining ability. Such as , group A had high specific combining ability if it crossed with lines that came from BSSS. Group B had high specific combining ability if it mated with lines that came from Syn3 or BSSS. Group C had high specific ability if it crossed with lines that came from 5003 or BSSS and had high general ability. So we thought classification of inbred by using the combining ability was very helpful to predicting heterosis.