Prasad, S.C.SINGH, AMRENDRA PRASAD2023-03-252023-03-251988https://krishikosh.egranth.ac.in/handle/1/5810195791GENETIC STUDIES IN RICEIn the present investigation two pigmented varieties Purple gora and V-20A were crossed with two non pigmented varieties R.A.U.4045-10 and IR 62. Two crosses R.A.U.4045-10 x purple gore and V 20 x IR 62 were used. The purpose of the present study was to find out the numbers of genes involved in the expression of anthocyanin pigmentation in twelve different plant parts in cross R.A.U. 4045-10 x Purple gora and nine plant parts in cross V-20A x IR 62. The pleiotropic gene action and linkage studies between genes governing the pigmentation in different plant parts in both the crosses were studies. The investigation revealed that from one to four pair of gene are involved in the expression of anthocyanin pågnen - tation in different plant parts in both the crosses. The anthocyanin pigmentation of leaf sheath, leaf axil, apiculus and stigma were found to be tetragenic (162 purple 94 green), leaf blade, leaf margin and tip, ligule, auricle and Junctura were governed by three complementary genes (27 purple : 37 green). The pigmentation in node and internode were controllled by two complementary genes (9 purple : 7 green), and hull color by two homozygous recessive gene ( 1 brown : 15 straw) in cross R.A.U.4045-10 x Purple gora. In second cross V-20A X IR 62. anthocyanin pigmentation of leaf sheath, leaf margin and tip, node, apiculus and stigns were governed by four complementary genes in a ratio of 162 purple 94 green, ligule colour by one recessive gene (1 purple 3 green), auricle, and junctura by four genes (117 purple : 139 green) and the inter node by four genes ( 27 purple 229 green). The joint segregation study between character has given evidence of pleiotropy, complete linkage and incomplete linkage. In cross R.A.U.4045-10 x Purple gora, the genes governing anthocyanin pigmentation in leaf sheath and leaf axil were found to have pleiotropic effects on leaf blade, leaf margin and tip auricle, ligule, juncture and apiculus. The genes governing anthocyanin pigmentation of leaf blade, leaf margin and tip and ligule were found to have pleiotropic effect on the pigmentation of node,stigma and hull colour. The genes for pigmentation in auricle were found to have the pleiotropic effects on the pigmentation of junctura, stigma and hall colour. The genes governing pigmentation of junctura were found to have the pleio tropic effects on the pigmentation of leaf blade, leaf margin and tipe ligule, stigns and hull colour. similarly gene for pigmentation in apiculus affected the expression of pigmentation in stigne. In the second cross V-20A x IR 62 the genes goveming pigmentation of leaf sheath had the pleiotropic effect on the leaf margin and tip, internode, apiculus and stigns. The genes for pigmented leaf margin and tip showed the pleiotropic effects on the pigmented auricle, ligule, juncture, node and internode. The genes for pigsented auricle ligule and junctura showed the pleiotropic effect on the pigmentation of apiculusand stigns. The genes governing the pigmentation of node was found to have the pleiotropic effects on the pigmented inter node. The genes for pigmented apiculus and stigns were found have pleiotropic effects on node and internode. The Leaf sheath with leaf axil, leaf sheath with stigna, leaf axil with stigna, leaf blade with leaf margin and tip, leaf blade with ligule and leaf margin and tip with ligula vere found completely linked in cross R.A.U.4045-10 x Purple gore. In cross V-20A x IR 62 the leaf margin and tip dthapiculus and stigns and apiculus with stigns were found completely linked. In cross R.A.U.4045-10 x Purple gora leaf sheath and leaf axil were found to be linked dth node, internode end hull colour. Leaf blade, leaf margin, tip and ligule were found to be linked d th internode and apiculus. Jucicle was found to be linked with leaf blade leaf margin and tip, ligule, node, internode and apiculus. Junctura was found to be linked with node, internode and apiculus. Node was found to be linked with internode apiculus and stigna. Internode was found to be linked with apiculus and stigna. Apiculum and stigma were found to be linked with hull colour. In the second cross V-20 x IR-62 leaf sheath was found to be linked dth auricle, junctura and node. Auricle was found to be linked with node. Ligule was found to be linked with node. Ligule was also found to be linked with auricle juncture and internode. linked with auricle and node. Juncture was alsoEnglishThesis