Fundamental studies on rice breeding through hybridization between Japanese and foreign varieties. : VIII. On some genes modifying anthocyanin coloration and their suppressors.

Abstract

Anthocyanin coloration in stigma and stem internode of the rice plant was considered by Nagao (1951) to be due to the two basic genes responsible for the production of the pigment, C and A. Takahashi (1958) has, however, confirmed in variety that coloration in stigma i-s controlled by a gene, Ps, Ivhich distributes the piglnent produced by C and A to the site. Although he had found the Ps-gene, he stated that sometimes stigma coloration could occur without its presence. If the genotype for the basic gene is either C^BA or C^BpA in the presence of the dominant P-gene, colored stigma is dis played. The results of the present experiment has, however, shown that Ps is indispensable for colored stigma and another gene, Pin, for colored stem internode. It has also been proved that even a weak basic gene constitution, C^BrA, presents colored stigma in the presence of Ps, which is determined as colorless by Takahashi (1958) .