Abstract:

Analysis on seed, cytoplasmic and maternal genetic effects for the contents of Hg was conducted by using genetic models for quantitative traits of seed in cereal crops. According to incomplete diallel cross design(6×5), parents and F1 generations derived from six different types of rice varieties (parental lines), were used for this experiment. The main results were as follows. Analysis on genetic variance showed that the trait of Hg contents involved were not only controlled by genes of seed, cytoplasmic and maternal plant simultaneously, but also affected obviously by genetic effects and GE interaction effects. The genetic main effect of Hg content were mainly affected by GE interaction effect. In genetic systems, dominant effect and dominant interaction effectsof Hg content were main, the genetic effect of seed had some effects on it. The results of heritability and selective response analysis indicated that the content of Hg content was high, single seed descent method is better. Different methods of screening and identification were used in breeding program according to genetic relationship which was controlled by different genetic system, in this way the breeding objective of decreasing Hg contents can be reached.