GENETIC ANALYSIS OF PLANT HEIGHT AND BRIX VALUE BY USING MAJOR GENE AND POLYGENE INHERITANCE MODEL IN A CROSS BETWEEN COMMON SORGHUM AND SWEET SORGHUM

The method of major gene and polygene inheritance model was used to analyze the inheritance of plant height and brix value in a cross between common sorghum Shihong137 and sweet sorghum L-Tian.P1,P2,F1 and F2 of the cross were applied in this sutdy.The optimum model for plant height was two pairs of complete dominant major genes and additive and dominant polygene inheritance model.The inheritance rate of major genes was 74.4% and that of polygene was 22.1%.The optimum model of brix value was one pair of additive and dominant major genes and additive-dominant-epistasis polygene mixed inheritance model.The inheritance rate of major genes was 65.72% and that of polygene was 20.43%.The number of major genes and genetic effects were consistent with those of QTLs identified in the same cross.