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Dagne Wegary Gissa
Bullo Neda Tulu
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Bullo Neda Tulu
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International Journal of Plant Breeding and Crop Science

Combining ability of inbred lines in quality protein maize (QPM) for varietal improvement

Bullo Neda Tulu1 and Dagne Wegary Gissa2

1Addis Ababa University, Selale Campus, P.O.Box 245, Fiche, Ethiopia.

2International Livestock Research Institute, CIMMYT, Ethiopia.

Accepted 10 November, 2015.

Citation: Bullo NT, Dagne WG (2016). Combining ability of inbred lines in quality protein maize (QPM) for varietal improvement. International Journal of Plant Breeding and Crop Science, 3(1): 079-089.

Copyright: © 2016 Bullo and Dagne. 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 cited.


Information on the combining ability of elite germplasm is essential to maximize their use for variety development.  Sixty-six F1 crosses resulted from diallel crosses of 12 QPM inbred lines and two standard checks BHQP542 and Melkassa6Q were evaluated to determine general (GCA) and specific (SCA) combining ability for yield and yield related traits using alpha-lattice design with two replications during the 2013 cropping season at Mechara. Analysis of variance showed that mean squares due to entries were significant for most traits studied, indicates existence of variability among the materials. Mean squares due to crosses and crosses versus checks were also significant for most studied traits. GCA and SCA mean squares revealed highly significant (p<0.01) differences for grain yield and most yield related traits. Inbred lines P1, P3 and P12 were good general combiners as the lines showed significant and positive GCA effects for grain yield. Among the crosses, P2 x P11 and P6 x P8 manifested positive and significant SCA effects for grain yield, indicating high yielding potential of the cross combinations. In general, this study identified inbred lines and hybrid combinations that had desirable expression of important traits which will be useful for the development of high yielding varieties.

Key words: Combining ability, quality protein maize, traits, yield components.