(1) In the present study, three genes for anthocyanin colour in various parts of the plant have been reported. The two basic genes, A (anthocyanin) and C (chromogen), produce colour in the apiculus and both are required, along with another specific gene, Lsc, for the development of colour in sheath and stigma.
(2) The black colour of lemma and palea is dominant to brown and is caused by four complementary genes, Hba, Hbb, Hbc and Hbd.
(3) The round shape of spikelet was found to be dominant to oval shape and was caused by four complementary genes Kra, Krb, Krc and Krd.
(4) Two duplicate genes, C1 and G2 cause short glumes.
(5) The anthocyanin gene A was linked with a glume gene, G1, with 17 per cent cross over while the spikelet shape gene, Kra, was located at a distance of 23 morgans from A; the latter two genes showed about 8 per cent cross over. The sequence of the three genes is A-G1-Kra. This linkage most probably belongs to the fourth linkage group in rice.
