QTL and Its Effect for Fertility of Indica-Japonic Hybrids in Rice
The F2 population of Zhenshan 97B / xiushui 13 were used for the material to test the effect of the fertility QTL to provide a theoretical basis for the utilization of heterosis between Indica and japonica, based on the F1fertility phenotypes of Indica-compatible Male Sterile Line. The results showed that: There was a QTL qPF5 controlling the pollen fertility with a value of additive effect-8.65 and a contribution rate of phenotype11.25%. Two QTLs conferring spikelet fertility were detected( qSF5 and qSF6). qSF5, with a value of additive effect-5.95 and a contribution rate of phenotype 9.11%, was the same fertility QTL with the control of pollen fertility of qPF5. qSF6, with a value of additive effect-8.55 and a contribution rate of phenotype 16.31%, was considered to be a wide compatible gene S5n. Breeding of indica type Male Sterile Lines of QTL(qSF6) derived from the indica alleles or wide compatibility gene could effectively improve the spikelet Indica-Japonica Hybrids fertility. qSF5 also had obvious influence. The sterility of Indica and japonica hybrid was affected not only by the fertility QTL, but also with the Indica-Japonica components of the parents and other factors.