8个玉米自交系配合力分析及应用评价

The Analysis of Combining Ability and Applied Evaluation of 8 Corn Inbred Lines

按P1×P2不完全双列杂交设计,用NCⅡ分析方法,对8个玉米自交系的9个性状的配合力及其群体遗传参数进行研究。结果表明:红系331、红系327和红系326的一般配合力高,可直接利用;而红系325和红系328综合性状较差,需改良后利用;红系326×K10等4个组合具有较强的杂种优势,有一定的增产潜力。在育种工作中,对玉米的生育期等6个性状宜早代选择,而对单株粒重等3个性状应进行晚代选择。

The 8 maize inbred lines have been tested on the paper with the de sign of P1 × P2 uncomplete diallel crossing of NCⅡ method to study on combinin g ability and its genetic parameters of 9 characters. The result indicated that the lines of Hongxi 331, Hongxi 327 and Hongxi 326 with the higher common combin ing ability can be directly used, the lines of Hongxi 325 and Hongxi328 with les s comprehensive character must be modified before use. The 4 combinations with h igher heterosis have potentiality of increasing yield production. In maize breed ing program, the 6 characters such as growing period should be selected earlier and the 3 characters such as kernel weight per plant should be selected later.