Abstract
ldentification of genotypes in respect to anthocyanin coloration in 23 rice varieties including 7 Japanese, 5 Indian, 3 Chinese, 2 Indonesian, 2 North American, 2 South American, I Viet-Namese and 1 Hawaiian variety was made. The gene system controlling anthocyanin coloration in Japanese rice plant assumed by NAGAO (1951) and TAKAHASHI (1957) is considered to be the most appropriate one among the gene schemes postulated by other workers. They assumed two complementary basic genes, C and A, responsible for the production of anthocyanin pigment together with some other genes which distribute the pigment to various sites of plant body. It has been confirmed from the results of testcrosses of the varieties used with the tester ones of known genotype that NAGAO and TAKAHASHI'S gene scheme is also applicable in the case of foreign varieties. In explaining C-A complementary action in one Indonesian and one South American variety, however, postulation of sotne new alleles in both the C- and A-gene series must be considered. A dominant gene, Pr, which controls the distribution of pigments over the whole surface of glumes has been found in each two Japanese and Indian varieties. Also an inhibitor. Ip, which lightens the color hue of apiculus and awn has been identified in 5 foreign varieties. It lightens blackish purple color due to CB A to the purple, making to show apparently the phenotype of Cˆ<Bp> A.
