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Hindi Research Article
Test Cross Mean Performance and Combining Ability Study of Elite Lowland Maize (Zea mays L.) Inbred Lines at Melkassa, Ethiopia
| Tessema Tamirat1, Sentayehu Alamerew1, Dagne Wegary2 and Temesgen Menamo1* | ||
| 1Jimma University, Collage of Agriculture and Veterinary Medicine, P.O.Box: 307, Jimma, Ethiopia | ||
| 2CIMMYT–Ethiopia, ILRI Campus, P.O. Box 5689, Addis Ababa, Ethiopia | ||
| Corresponding Author : | Temesgen Menamo Jimma University, Collage of Agriculture and Veterinary Medicine P.O.Box: 307, Jimma, Ethiopia Tel: 251919118568 E-mail: temesgen2008@hotmail.com |
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| Received August 26, 2014; Accepted September 16, 2014; Published September 16, 2014 | ||
| Citation: Tamirat T, Alamerew S, Wegary D, Menamo T (2014) Test Cross Mean Performance and Combining Ability Study of Elite Lowland Maize (Zea mays L.) Inbred Lines at Melkassa, Ethiopia. Adv Crop Sci Tech 2:140. doi: 10.4172/2329-8863.1000140 | ||
| Copyright: © 2014 Tamirat T, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. | ||
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Abstract
In Ethiopia, there are several maize production constraints, among which shortage of improved varieties is the major one. The objective of this study was to observe the mean performance of crosses and estimate combining abilities for grain yield and other agronomic traits in thirty six maize inbred lines using Line x Tester mating design. Seventy-two lines x test crosses (L1xT1, L1xT2, L2xT1, L2xT2… L36xT1 and L36xT2) and three standard checks were evaluated for 11 traits in alpha lattice design at Melkassa, Ethiopia. Analyses of variances showed significant mean squares due to crosses for all traits. Among the crosses, L34xT2, L36xT2, L30xT1, L19xT1 and L33xT2 crosses were the top five highest grain yield mean performance. While L35xT1, L23xT1, L13xT1, L24xT2 and L15xT1 crosses were lowest mean grain yield performance. GCA Mean squares were significant, but SCA mean squares were non-significant for all traits. The ratio of GCA/SCA mean square was high which exhibited the preponderance of additive gene effects in the inheritance of all traits. Furthermore, the GCA sum of square component was greater than the SCA sum of square for all traits, supported that variation among crosses was mainly due to additive rather than non-additive gene effect. Inbred lines L15, L25, L27, L33, L34 and L35 were the best general combiners for
grain yield, and hence were promising parents for hybrids as well as for inclusion in breeding programmes for yield improvements. Inbred lines L2, L3, L4, L6, L10, L27, L30, L31 and L32 had negative and significant GCA effects for the days to anthesis, indicating that the lines had gene combinations that can enhance early maturity.
