Heterosis and Parentage Regression Relation Analysis of Seed Reserve Utilization Efficiency in Sh2 Sweet Corn

Abstract:

To reveal the genetic effect of parents on F₁ seeds reserve utilization of Zea mays L. var. saccharata Bailey, the heterosis and regression relation between parents and F₁ hybrid seeds from 19 inbred lines and 10 hybrid combinations were studied. The results showed that there were obvious differences in contents of starch, protein, fat, 100-seed weight, the weight of mobilized seed reserve and seed reserve utilization efficiency between inbred lines and F₁ hybrid seeds. There were significant differences in starch content, fat content and 100-seed weight between parents on F₁ seeds. The starch content and 100-seed weight of F₁ hybrid seeds were higher than those of parents, while other traits were lower. However, the 100-seed weight and seed reserve utilization efficiency in F₁ seeds from the combinations of FH14, Q26, GT22 and GT2 had strong heterosis by cluster analysis, which had significant difference in characters. Regression analysis showed that female parent had positive effects on the mobilized seed reserve and seed reserve utilization efficiency, but have negative influences on starch content and 100-seed weight of F₁ seeds, while male parent have negative effects on starch content and have positive effect on seed reserve utilization efficiency.