The Relationship of the Fertility of F1 Hybrid Rice with Cheng''s Index Difference and Isozyme Genetic Distance
水稻杂种F1结实率与亲本程氏指数差异和同工酶遗传距离的关系及其预测研究

Three hundred and sixty hybrid F1s from 4 indica (IR36 and Nanjing 11) and japonica (Balila andAkihikara) rice as female parents crossed with the rest male parents were used to study the spikelet fertility inrelation to Cheng's index difference (ID) and to isozyme genetic distance (GD). The results showed that ID and GD significantly negatively correlated with F1 spikelet fertility (r=-0.540, p<0.01; r=-0.316, p<0.01), but thedeterminative coefficient was low, which was 0.2916, 0.0999, respectively. The correlation between F1 spikelet fertility and ID or GD were influenced by both male and female parents. ID and GD were useful for predicting F1 spikelet fertility in varieties of non-wide compatibility, but were not effective for fertility prediction in wide compatiblevarieties and in Nanjing 11. Therefore, ID and GD used for prediction of F1 spikelet fertility are effective only in certain types of rice materials, and ID is more efficient than GD.