Abstract
There are quite noticeable discrepancies between the linkage groups of Japonica and Indica rices. Many kinds of genes concerning anthocyanin coloration are not identical between the both groups even though the same gene symbols are assigned arbitrarily. It is estimated that the gene system on coloration in the Japonica group is partly different Lrom in the Indica group. In this report, the authors carried out the genic analysis on the coloration using intervarietal crosses between Japonica and Indica rices. Though the gene system on the fundamental coloration in Japonica rice fitted in those crosses studied here without any alteration, a new distribution gene for the coloration was needed for explaining the mode of inheritance on the coloration of plant body. Namely, a single dominant gene, Pin1 was responsible for the coloration of a part of leaf and stem nodes, and the entire surface of internode under the existence of the high ranking genes of C-A groups. In addition, the causal gene, Pin1 belonged to the 2 nd linkage group showing the recombination values, 30.9% and 40.O% with Pl and lg, respectively. Although the genes such as Pin1 showing a complementary effect were reported in Indica group, it was quite difficult to compare their loci with Pin1 owing to the discrepancies between Japonica and Indica linkage groups.
