Analysis on the Combining Ability and the Correlation of the Main Maize Characters of Several New Inbred Lines Bred by Our-self and Inbred Lines Used Normally

Fifty five crosses were made by NCⅡ(11×5) design,including 5 new maize inbred lines bred by ourselves and 11 inbred lines which were normally used in current maize cultivation.All crosses were studied for combining ability of 7 main characters,and studied GCA correlation between another 6 maize characters’ GCA with kernel weight of single ear’s GCA.The results showed that eight higher GCA of kernel weight of single ear inbred line were selected,which were Xi-ang7298,Xiang2178,Xiang706,Xiang329,Lx9801,PH6WC,Zheng58 and Y8G.The combinations of Xiang2178 ×Xi-ang7298,Xiang706×Xiang7298,PH6WC×Xiang7298,Y8G×Xiang7298,Xiang329×Xiang7298,9041×Xiang7298,Xiang4887× Lx9801,Lim50×Xiang7298,Xiang706×Chang7-2 and Xiang706×Xun926 performed best among 55 crosses.The increase in kernel weight of single ear’s GCA is an important foundation for increasing productivity,it is very possible that breed in-bred lines with higher kernel weight of single ear GCA so as to get new high yielding group.The GCA increase of ear length,kernels per row,1000-kernel weight can be effective in raising kernel weight of single ear’s GCA