Heterosis and Combining Ability Estimates for Grain Yield and its Components in Maize Genotypes (Zea mays L.)

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Khalafalla, M.M
Abdalla, A. H.
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Faculty of Agriculture, University of Khartoum, Shambat, Sudan
Field experiments were carried out at two locations (Shambat and Wad Medani) to estimate heterosis and combining ability in maize in season 1992/93. A set of 45 genotypes, comprising nine parental genotypes and their 36 F1 hybrids, was used in the study. The experiments were conducted under irrigation in a randomized complete block design with three replications. Heterosis and general and specific combining abilities for seven characters were estimated. The highest magnitude of heterosis over mid-and better-parent was expressed for grain yield (kg/ha) at both sites. Grain yield/ha and 100-grain weight were controlled mostly by additive gene action, whereas cob weight and grain yield/plant were controlled by both additive and non-additive gene effects. The commercial cultivars Giza 2 and Variety 113 ranked high in general combining ability among the parents, indicating their value in future population improvement programmes.
Page(s): 5 (2), 70- 85, 22 Ref