Genetical studies on rice plant.XIII. : Further studies on the gene PI responsible for the development of anthocyanin coloration in leaf rice.

Abstract

The full purple leaf character of rice designated as Murasaki-Ine (Purle rice). develobs in the presence of the gene P1 in combination with apiculus color genes C Sp. The gene C is concerned with the formatioh of chromogen and five allles CB, CBp, Cp and c are know at C-locus. The gene Sp has CBt to do with the formation of reducer ior C and three alleles Sp, Sp1 and sp at Sp-locus are known. The phenotypic expression of 'che Pl is dependent on the constitution of these nes of apiculus coloring. Thus Pl Inay be said to be one of the modifying gene which in responsible for distributing the pigment substance produced in apiculus over the. whole sufarse on leaf blade, Ieaf sheath, purvinus, auricle, liule, stem and stem node. The effect of Pl is diminished by the presence of the inhibitor for Pl (genic symbol ll) that inhibits the coloration at the centre of leaf blade. Pl gene links with the genes d2 ior "Ebisu " dwarf and lg for liguleless. The recombination values are as follows 38-39 per cent for d, and Pl, 18-16 per cent for PI and lg and 42-50 per cent for d, and lg, suggesting that the order of these genes is dPling. Histologically the coloration of Murasaki-Ipe is due to the coloring cell sap in epidermis, paren-chyma, sclerenchyma and motor cells.