Abstract:

The positive, effect-increasing and effect-decreasing loci (PL, IL, DL), which were screened from the parental AFLP polymorphic loci (TL) by the yield traits of two sets of half-dialell mating crosses designed used 13 cytoplasmic male sterile lines and 19 restorers of rice, respectively, together with TL, were utilized to estimate parental genetic distances (GDs), and the models were founded to predict the traits of hybrids derived from different parents. The results were as follows: 1) PL occupied a few number of the TL, and its correlations between the predictive and authentic values of yield traits (termed as briefly predictive coefficient as following) were too low, as same as TL. 2) But The predictions by IL, DL or IL/DL (founding duality models) were increased significantly, e.g. the predictive coefficients were all above 0.6 such as IL for grain setting percentage, IL, DL or IL/DL for grain weight per plant, therefore, these models could be used as prophecy of rice breeding. 3) In addition, the predictions based on IL, DL or IL/DL from intersection of two sets of crosses were higher enough, four of which above 0.5, and was more suitable in molecular breeding due to less predictive loci required.