Analysis on the Heterosis and Combining Ability among Some Cotton Germplasms(Gossypium hirsutum L.)

The crosses were made by using transgenic Bt cotton, colored cotton et al to analyze high parent heterosis, mid parent heterosis and competitive heterosis and combining ability effects for 10 characters. The results showed that the heterosis for yield and fiber properties were obvious. The average high parent heterosis of pre frost lint yield, was 2.91%,and 10 crosses had positive heterosis; The average mid parent heterosis of this character was 22.45%,and 21 crosses had positive heterosis; The average competitive heterosis of the trait was 14.21%, and 4 crosses had positive heterosis.High heterosis of boll number per plant was observed among other yield traits. 2.5% Span length possessed a significant heterosis, while negative heterosis of Micronaire value was also significant among the fiber quality traits. Nutn 33B, 6802 and 94AP14 of the female,96 67,99 16 and 96 55 of the male were good perants with high genetic combining ability for most of characters,While A1B3,A4B1 and A5B3 were good crosses with high SCA for most of traits.