Twelve hybrids crossed among 3 cytoplasmic male sterile lines(MsYZ206-9, MsYZ203-6 and MsYZ216-1) with 4 varieties of flue-cured tobacco(Honghuadajinyuan, Yunyan 87, GS0, G28) were studied on their genetic effects and heterosis in thefollowingchemical quality characters: TS, Nic, TN, K20, CI, TS/Nic, TN/Nic, K20/Cl by use ofsimple additive and dominant genetic mnode. The results showed: (1)TS with high additive effect and low dominant effect had small potency in hetemsis, while the other traits, which were mainly controlled by dominant ...