Analysis and Estimate on Combining Ability of Inbred lines from Three Populations

Combining ability and heterosis of 18 inbred lines were analyzed using 4 inbred lines (444, B73, Mo17 and Dan340) as common testers in a NC-Ⅱ mating design. The inbred lines tested were selected from Pinzong1 population, Zhongzong 3 population and Shanzong 5 population. The results showed that highly significant differences existed in combining ability among inbred lines which were chosen from the same population and from different populations. Three inbred lines obtained from Shanzong 5 population and one line from Pinzong 3 population had high GCA (general combining ability). There was high SCA and heterosis in inbred lines obtained from Shanzong 5 crossed with Dan 340 and in lines from Zhongzong 3 crossed with Mo17and B73 and in lines from Pinzong 1 crossed with 444 and Dan 340.