8个玉米自交系主要性状的配合力及遗传参数分析

Analysis of combining ability and genetic parameters of main characters of eight maize inbred lines

按照P_1×P_2不完全双列杂交设计,用NCⅡ分析方法,分析了8个玉米自交系的株高、穗位高、穗粗、穗长、穗行数、行粒数、秃尖、百粒重和小区产量9个性状的GCA、SCA及遗传参数。结果表明:这9个性状主要受加性基因效应控制,非加性基因效应作用较少。C_1、C_3和C_5的一般配合力高,是有利用价值的亲本。C_6穗部性状的一般配合力高,可根据育种目标有针对性的选用。C_2和C_7综合性状较差,需改良后利用。ZH3、ZH16和ZH24等组合具有很强的杂交优势和增产潜力,在实际生产中应加强利用。在育种工作中,应对玉米株高、穗位和产量等8个性状进行早代选择,对百粒重应进行中代或晚代选择。

The eight maize inbred lines have been tested with the design of p1×p2incomplete diallel crossing of NCII method to study on general combining ability（GCA）,special combining ability（SCA） and hereditary parameter of nine character which were plant heigh, hight from ground to ear, ear length,ear thickness, ear rows, row grains, bald tip length, weigh of hundred grain and plot yield. The result showed those nine character were majorly controlled by the effects of additive gene with less action of non-additive gene effects.The lines of C1,C3 and C5with the higher common combining ability, its use value of the parent. The lines of W46 with higher common combining ability of ear character, which could be selected according to the breeding targeted. The lines of C2 and C7with less comprehensive character must be modified before used. The three combination of ZH3,ZH16 and ZH24 with heterosis and Yield potential is very strong, In the actual production we should strengthen to use it. In maize breeding program. The eight character such as plant heigh,ear heigh and plot yield per plant should be selected earlier and the character such as weigh of hundred grain per plant should be selected interim or later.