| Screening out strong heterosis combinations from 36 F1 combinations, with P1, P2, F1 in randomized block,
repeated 3 times, plant traits, Verticillium wilt, yield components and quality changes of cotton in growth period were
determined. By analysis on heterosis relationship between F1 hybrid cotton and their parents, the change trend of F1 was
revealed. The results showed that, compared to parents, plant heights and number of fruit branches of F1 hybrid exceeded
the high value parent Y5-1; the growth period was consistent with the early parent; high nods order of fruits and height of
first fruit branches were close to the mean values of two parents; disease resistance was over the seriously ill parent, but
lower than the parent of mild disease; weight of cotton bolls was significantly greater than parents; seed cotton yield showed
obvious positive mid-parent heterosis and transgressive heterosis, their strengths were 76.6% and 25.4%, respectively. In
quality traits, those hybrids showed no signs of transgressive heterosis; fiber length and maturity index were as the same as
P2, the other traits were close to the value of mid-parents. The research indicated that hybrid and selection play important
role in heterosis ultilization, and according to Xinjiang actual situation, more research should be done in the future, to
enhance the F2 hybrid breeding research. |
