Pleiotropy and linkage in rice (Oryza sativa L.). III. Linkage involving basic and inhibitory genes for pigmentation: leaf blade, sheath pulvinus, glume (empty), nodal septum and blackening of lemma/palea

Inheritance pattern of anthocyanin pigmentation in leaf blade, sheath pulvinus, glume (empty) and nodal septum and a nonanthocyanin pigmentation character, namely, blackening of lemma/palea, was studied ina cross between the upland rice cultivars D 6-2-2 and HY-256 Purple. Three to five pairs of interacting genes have been found to govern pigmentation in these plant parts. An anti-inhibitory gene for pigment synthesis in leaf blade is pleiotropic - by producing pigment in glume (empty) and nodal septum also. Linkage has been established between the basic genes for pigmentation in leaf blade, nodal septum and sheath pulvinus and the inhibitory genes for pigmentation in glume (empty) and blackening of lemma/palea. This linkage group (PI-Pm_a-Pu-I-H-I-Pg) probably forms a part of the II (lg) linkage group of Misro et al. In that case, the four genes Pm_a, Pu, I-H and I-Pg are new additions to this linkage group.