EVALUATION AND DEVELOPMENT OF RICE BREEDING METHOD USING DNA MARKERS.

利用重组自交系(RI系)、F2群体和回交群体，对抽穗期、茎长、穗长等性状进行了QTL分析。检测到许多可能控制某些性状的QTL。在对抽穗期的QTL分析中，进行了反复细致的检验。此外，利用染色体片段替换和近等基因系的衍生品进行了抽穗期QTL的连锁和替换定位，提供了QTL的清晰信息。通过监测Asominori和IR24杂交F3、F4和F5代的RFLP基因频率，评价了冲绳地区水稻杂交育种中的快速高级世代。在半矮秆基因(SD1)附近观察到明显的切面压力。

Using recombinant inbred lines (RI lines), F2 population and backcross population, QTL analysis for several traits, such as heading date, culm length, panicle length and etc., was performed. Many putative QTLs for some traits were detected. In QTL analysis specially for heading date, repeated and detailed examination was done. In addition, the linkage and substitution mapping of QTLs for heading date were done using the derivatives of the chromosome segment substitution and near-isogenic lines and gave the clear information about the QTLs.The rapid advanced generation at Okinawa in rice cross breeding was evaluated through monitoring the RFLP gene frequency in F3, F4 and F5 generations from the cross of Asominori and IR24. Section pressure near the region of semidwarf gene (sd1) was apparently observed.