<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Genetics of grain iron and zinc concentration in pearl millet (Pennisetum glaucum (L.) R. Br.)"^^ . "Pearl millet (Pennisetum glaucum (L.) R. Br.) is an important staple crop for\r\nmillions of poor rural households in the semi-arid tropics of Asia and Africa. Owing\r\nto its importance for addressing micronutrient malnutrition problem, especially iron\r\n(Fe) and zinc (Zn) concentration, considerable global efforts are under way to\r\nimprove its Fe and Zn levels through genetic enhancement. Hence, this dissertation\r\nwas aimed at investigating some of the factors that have direct bearing on breeding\r\nefficiency. These includes gene action, combining ability and heterosis for Fe and Zn,\r\nintra-population variance, efficiency of single plant selection, association of grain Fe\r\nand Zn concentration with grain yield and key agronomic traits (1000-grain mass and\r\nflowering), and response to recurrent selection.\r\nIn two sets of line x tester studies, parents were observed having a\r\nwide range of genetic variability for both grain Fe (34 -102 mg kg-1) and Zn\r\n(34 - 84 mg kg-1) concentration and this was also reflected in both sets of\r\nhybrids. over two season, ICMB 93222, ICMB 98222, 863 B, ICMB 95333,\r\nICMB 96333 among seed parents (lines) and IPC 774, IPC 616, IPC 1650,\r\nIPC 1178, IPC 536 and IPC 735 amongst pollen parents (testers) were found\r\nto have >60 mg kg-1 Fe and >55 mg kg-1 Zn concentration. All these inbreds\r\nare designated seed/pollinator parents in elite genetic backgrounds, indicating\r\ngood scope for their effective use in hybrid and hybrid parents breeding.\r\nThe predictability ratio was around unity for all traits, revealing the\r\npredominance of GCA (additive) variance controlling these traits in both the\r\nsets. Highly significant positive correlation between mid-parent value and per\r\nse performance of hybrids further confirmed the predominant role of additive\r\ngene action for these traits. using both parameters (per se performance and\r\npositive significant gca effect), ICMB 93222, ICMB 98222, 863b, ICMB\r\n91222, IPC 1650, IPC 843, IPC 774, IPC 1178, IPC 689 and IPC 735 were\r\nidentified as good general combiners for grain Fe and Zn in hybrid breeding.\r\nsimilarly, 863 B x IPC 404 and ICMB 95333 x IPC 404 for both grain Fe and\r\nZn, while ICMB 94111 x IPC 1178 and ICMB 89111 x IPC 843 for grain Zn\r\nhad positive significant sca effects. Low level of heterosis over mid-parent\r\nfor grain Fe and Zn, no hybrid with significant heterosis over better-parent,\r\nand largely additive genetic variances would imply that there would be little\r\nopportunity, to exploit heterosis for these traits. In fact, to breed hybrids with\r\nhigh Fe and Zn levels, these micronutrients will have to be incorporated in\r\nboth parental lines.\r\nHigher degree of positive and highly significant correlation between S0\r\nplants and their respective S1 progenies both for grain Fe and Zn in all four\r\npopulations indicated that individual plant performance for these\r\nmicronutrients can be as effectively used for selection as the S1 progeny\r\nperformance. Highly significant positive correlation between Fe and Zn revealed\r\ngood prospects of concurrent genetic improvement for both micronutrients. Recurrent\r\nselection for high grain Fe and Zn in two populations increased Fe concentration by 2.4%\r\nto 8.0% and Zn concentration by 5.4% to 7.9%. It also increased 1000-grain mass by\r\n4.8% and 14.2%, changed flowering time from -2.3% to 0.8% and had no adverse effect\r\non grain yield. This would indicate that selection for Fe and Zn concentration can be\r\nmade without compromising on grain yield and other agronomic traits such as large seed\r\nsize and earliness."^^ . "2011" . . . . "Tamil Nadu Agricultural University"^^ . . . "Centre for Plant Breeding and Genetics, Tamil Nadu Agricultural University"^^ . . . . . . . . . "M"^^ . "Govindaraj"^^ . "M Govindaraj"^^ . . . . . . "Genetics of grain iron and zinc concentration in pearl millet (Pennisetum glaucum (L.) R. Br.) (PDF)"^^ . . . . . . . . . . . "PhD_Thesis_MGOVINDARAJ_1.pdf"^^ . . . "Genetics of grain iron and zinc concentration in pearl millet (Pennisetum glaucum (L.) R. Br.) (Image (JPEG))"^^ . . . . . . "Genetics of grain iron and zinc concentration in pearl millet (Pennisetum glaucum (L.) R. Br.) (Indexer Terms)"^^ . . . . . "HTML Summary of #996 \n\nGenetics of grain iron and zinc concentration in pearl millet (Pennisetum glaucum (L.) R. Br.)\n\n" . "text/html" . . . "Millets"@en . .