Abstract
In order to analyse the genic system for purple coloration of the pericarp and its linkage relations, the F2 ratios for the purple coloration of pericarp were investigated with particular attention to its linkage relations to the anthocyanic pigmentation of various other organs. When strains with colored and colorless pericarps are crossed, 9 purple : 3 brown : 4 colorless ratios were found in the F2. It was assumed that two genes Pp and Pb are concerned with the purple coloration of the pericarp; Pp is epistatic to Pb, and Pp was found to be closely linked with A, one of apiculus-coloration genes, with a recombination fraction of 5.1-9.4 %. They belong to the linkage group III of NAGAO and TAKAHASHI.
