Analysis Of Genetic Potential Of Six Synthetic Maize Populations

Lack of germplasm resource is one of the major factors restricting corn breeding in China. Study of the genetic diversity among germplasms is important for broadening the basis of corn breeding. The objectives of our study were to investigate the genetic potentiality in the six synthetic maize populations. Which were analyzed with SSR markers and field experiments.1 Field results of the six synthetic populations observed in two seasons (spring and summer) showed that variances were significant in all the observed traits except green leaves at dough stage and kernels/row.2 Table 3 showed that plant height and ear height were lower in P₁ and P₅ with shorter parenting time; Rows/ear were better in P₁ and P₂ than in other populations; Most traits in all the populations were not as good as those in the controls.3 Normal distribution was observed in yield per plant within the five populations. The frequencies of plants with an average yield per plant higher than 153.3 g, in the six populations were different, which in P₁, P₂, P₃, P₄, P₅ and P₇ were 25.2%, 27.7%, 27.4%, 19.5%, 12% and 24.7%, respectively. In the populations P₃, P₄ and P₅, comparatively greater coefficient of variation (CV) was detected for economic traits.4 The objectives of this Study were to analysis is the combining ability through incomplete diallel cross design. The results showed that the GCA of most traits observed were significant among 6 synthetic populations. The SCA of many economic characters were detected that it was significant between combinations. The results of GCA showed that most major economic traits of P₄, P₂ and P₇ were higher. Some combinations were more than CK in yield per plant and the traits of plant heights were better in P₂ and P₇, which were excellent in breeding potential. The economic traits of P₁, P₃ and P₅ were lower in GCA and their excellent combinations in SCA were fewer in yield per plant. The breeding potentialities were lower for P₁, P₃ and P₅.5 At the same time, we analyzed the six populations with their SSR markers. The genetic diversities of all the six maize populations were detected by 26 SSR primers, which were distributed on the 10 maize chromosomes. In these populations, totally 246 alleles...