Analysis on the Utilization Potentiality of 16 American Materials from Germplasm Enhancement of Maize
Combining ability of 16 GEM maize materials from CIMMYT and 5 self-bred inbred lines was analyzed.Eighty hybrids in NC-Ⅱ mating design were evaluated in field using randomized block design in triplicate, the heterotic groups were clarified and their utilization potentiality was analyzed.The results indicated that significant or highly significant differences were observed in GCA for most 8 parental characters.Highly significant differences were observed in SCA except bald top length.Among them, the integrated GCA in each trait of GH358 was the highest, and higher in GR9, GR15 and GH291, GH302, both the yield SCA and TCA were the highest in cross GH281×GR15.Clustering diagram indicated that 16 American GEM maize materials were divided into Ⅱ heterotic groups and 5 sub-groups.GH358 was the most ideal parent material GR9, GR15 and GH291, GH302 proved to be valuable maize materials, the probability of high yield combination is greater using them as parents.GH281 ×GR15 was the strong heterosis combination selected, GH230×GR2, GH358×GR22 and GH266×GR9 could be used as a combination of superiority for further screening and identification, yield combining ability in GH219 × GR10, GH266×GR2, GH283×GR 10 were better and should focus on the improvement and utilization.
MaizeGEM germplasmCross combinationCombining abilityHeterotic group