Abstract:

The genetic segregation analysis of stalk sugar content (Brix) was made with the parents of LR625, a grain sorghum variety (P1), Rio, a sweet sorghum variety (P2) and their F1 and F2 population using the mixed major gene plus poly-gene inheritance model. The results suggested that stalk sugar content (Brix) was controlled by two major genes with additive-dominant-epistatic effects and poly-genes with additive-dominant effects. The additive effects of the two major genes were -4.004 and -2.116 respectively, and the dominant effects of the two major genes were 0.084 and -0.426 respectively. The heritability of major genes was 83.27% and the heritability of poly-genes was 7.38%. This study indicated that the trait of stalk sugar content (Brix) is mainly affected by two major genes through additive effects. And the results can provide reference for QTL mapping and selection of stalk sugar content.