Genetics of morphological characters in rice (Oryza sativa)

Abstract

An experiment was conducted at the NBPGR, Ranchi and rice research farm, BAU, Ranchi during 1989-94 using
six cultivars; 'NIC 40484', 'NIC 10514', 'CR 3001', 'AC 1225', 'Blackgora' and 'Browngora' rice (Oryza sativa L.) were
used to study the inheritance and linkage relationship of some morphological traits. It was found that presence of
normal ligule was dominant over ligule less, normal auricle over auricleless, normal junctura over rudimentary junctura,
awning over awnless, unipistillate ovary over multi pistillate ovary, short glume over long glume and normal culm over
brittle culm in the 'CR 3001' x 'AC 1225' cross. The characters-ligule, auricle, junctura, glume, pistil number, awn and brittle culm were found to be governed by one pair of major genes. The pigmentation in F, was observed in leaf axil
and apiculus but pigmentation in leaf blade and internode was dominant but inhibited. The pigmentation was found to
be governed by four dominant genes in leaf axil (162P:94G), 2 gene pairs in leaf blade and internode (3P: 13G).and 3
major gene pairs in apiculus (45P: 19G) in 'CR 3001 'x 'AC 1225' cross. The sheathed panicle was found to be governed
by single dominant gene (3S:1E) in 'NIC 40484' and inhibitory genes (13S:3E) in 'NlC 10514'. The gene for sheathed panicle in 'NIC 40484' was found to be located on chromosome 12. The red kernel in 'Browngora' was controlled by 3 dominant complementary genes. The linkage studies was carried out in 'CR 3001' x 'AC 1225' cross only. The genes lg, Pin, PI and Px were found to be linked. Based on crossover values, gene order on the linear scale was found to be Ig-Pin-Pl and Px in linkage group II.