Linkage studies in rice (Oryza sativa L.): Flowering,growth habit and pigmentation

Summary Genetic analysis of ten characters in a rice cross M 18 × T979 revealed the interaction of duplicate, complimentary, inhibitory and anti-inhibitory genes in conditioning pigment in eight characters and in determining flowering and growth habit. The action of genes and their interactions indicated by complex ratios for all the ten characters are claimed to be the first reports. pleiotropic action of two complementary genes and four duplicate genes has been detected. Two linkage groups, one with three genes (Ai-Plg-Ai-Pau-Pja) and the other with nine genes (Plg_a-Pin_a-Er_a-Ef_a-I-Plg-Pg₁-Pn₁-Pr₁-Pnr₁) have been constituted. The three-gene group is tentatively placed in the IV mp group and the other with nine genes is assigned to the X fh group. As a result of the present investigation Ai-Plg is an addition to the IV mp group and Plg_a, Pin_a, Er_a, I-Plg, Pg₁, Pn₁ Pr₁ and Pnr₁ are contributions to the X fh group.