Linkage Analysis by Reciprocal Translocation Method in Rice Plants (Oryza sativa L.) : III. Marker Genes Located on Chromosomes 2, 3, 4 and 7

The reciprocal translocation method was employed, for the most part, to conduct linkage studies in rice plants. Thirty reciprocal translocation lines, thirteen marker genes and the C type trisomics were use in this study. A gene for round kernel was identified and designated as rk2. It was found that the marker genes, d1 (linkage group VI), nl1 (IX) and ri (IX) were associated with chromosome 2. Therefore, the results supported the early studies on the integration of the linkage groups VI and IX by the trisomic method. The linkage group III to which eg, spl6' lax and d10 belong corresponded to chromosome 3. It was found that a gene, d18' was located also on chromosome 3. A gene for spotted leaf, spl1' which was found as one of the genes composing a new linkage group by IWATA and OMURA (1975), was located on chromosome 4, and it was also suggested that rl1 and nal2 were located on the same chromosome. The three genes, fl, pgl and rk2, were shown to be located on chromosome 7.