20份玉米新材料在东北地区的育种潜力分析

In this paper, in order to germplasm innovation, 20 new maize materials were created from the U.S. maize inbred lines as donor and elite inbred lines as recipient. The 20 new materials were crossed to four testers including CA667, PH4CV, CA331 and Jing725 adopting NCⅡgenetic design. The crosses and one check Xianyu335 were evaluated in Liaoyuan and Tonghua of Jilin province and Tieling of Liaoning province to analyze the combining abilities and heterosis. The results indicated that the nine new materials including L1, L3, L7, L9, L11, L14, L15, L18 and L19 showed the high general combining abilities (GCA) effects for grain yield. The donor inbred line E8501 had significant potential for shortening the date to silking, reducing plant height, ear height, percent stalk lodging and grain moisture at harvest and increasing grain yield, which can be further used. The two crosses L6×CA667 and L16×CA331 showed the similar growing period with the check Xianyu335, and higher grain yield (2.40% and 2.75%) than that. In addition, these crosses also had goodperformance in other agronomic traits, and could be further tested in multi-environment. The above results could provide reference for future breeding utilization.??