摘要
中籼迟熟水稻品系８９８７含未知的长生育期基因，在杂交水稻育种中有重要的利用价值，应用该品系与４个不同生态类型的水稻品种杂交，对其Ｆ１和Ｆ２群体进行生育期调查和遗传分析，确认８９８７的长生育期受１对隐性主效基因控制。以（８９８７Ｘ地谷）Ｆ２群体为基础，应用ＲＦＬＰ和微卫星标记结合群分法，发现第７染色体的ＲＦＬＰ标记Ｃ２１３与该基因连锁；进一步应用Ｆ２分离群体将该基因定位于第７染色体上，暂定名为ｌｆ－３。此基因的发现和定位将有助于分子标记辅助选择和杂交水稻的改良。
8987 is a fare flowering (lf) indica cultivar. In this study, genetic analysis for lf was carried out in the crosses between 8987 and four varieties with different heading time. Inheritance of lf in F1, plants and F2 populations clearly revealed that the lf of 8987 is controlled by one recessive gene. Bulked--segregant method and cosegregation analysis in Fi population were used to screen molecular markers, which were linked with lf gene. The results showed that the lf gene was mapped between the two RFLP marker C213 and RG404 on chromosome 7. The tagged gene will be utilized in molecular marker assisted selection in the future rice breeding program for new varieties.
