Angarawai, I.I. and Kadams, A.M. and Bello, D. and Mohammed, S.G. (2009) Interaction of gene effect and number of loci on heritability and heterosis for downy mildew resistance in Nigerian elite pearl millet lines. American-Eurasian Journal Agricultural & Environmental Science, 5 (1). pp. 106-114.
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Abstract
The inter-relationship among genetic parameter is of great importance as this tells on the phenotypic selection. Five pearl millet parental lines; BUDUMA, SOSAT-C88, LCICDMR36-4, 20B-2 and 25B-4 were obtained from Lake Chad Research Institute Maiduguri. From the five parents 6F s, 6F s 6BC P s and 6BC P s 1 2 1 1 1 2 were generated using factorial mating design of North Carolina Design II, during November, 2004 and May, 2005 Off-season at Lake Chad Research Institute Maiduguri. The five parents, twenty-four crosses and one check (7042S) were evaluated using Randomized Complete Block Design (RCBD) with three replications at the downy mildew field nursery of Lake Chad Research Institute and the Experimental Farm of Federal University of Technology, Yola during 2005 and 2006 seasons. Results from this studies suggest that while dominance gene effects is important in expressing especially heterosis with 34.05% contribution, for resistance to downy mildew incidence and severity, it is higly limited by number of loci involved. Number of loci contributes 17.4% and 47.7% to total inheritance of resistance to downy mildew incidence and severity and about 8.39% and 7.33% to heterosis for resistance to downy mildew incidence and severity, respectively. Crosses involving SOSAT-C88, which had high estimates for number of loci (6, 7) controlling resistance for incidence expressed high narrow-sense (93.00%, 78.46%) heritability estimates and high significant negative higher-parent [(-79.78% and -94.79%), (-90.04% and -89.08%)] heterosis (considered advantageous) for downy mildew resistance.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Lake Chad Research Institute, P.M.B. 1293, Maiduguri, Nigeria |
| Subjects: | Plant Production |
| Divisions: | Millet |
| Depositing User: | Mr T L Gautham |
| Date Deposited: | 05 Jan 2011 19:43 |
| Last Modified: | 05 Jan 2011 19:43 |
| Official URL: | http://www.idosi.org/aejaes/jaes5(1)/17.pdf |
| URI: | http://eprints.icrisat.ac.in/id/eprint/1264 |
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