Millets Research Station

Rāwalpindi, Pakistan

Millets Research Station

Rāwalpindi, Pakistan
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Haq M.I.U.,Millets Research Station | Ajmal S.,Pmas Arid Agriculture University | Kamal N.,Maize Breeding Sub Station | Khanum S.,Millets Research Station | And 2 more authors.
Journal of Animal and Plant Sciences | Year: 2013

The present study was conducted to evaluate genetic and epistatic effects governing the inheritance of grain yield and yield components. Parental material comprising of six genetically different maize inbred lines were crossed to produce F1, F2 and backcross generations. The analysis of variance showed significant differences among generations. Generation mean analysis revealed the preponderance of non-additive effects for all the characters under study. Please revisit. l (dom×dom) component was significant in all three traits with exceptions of few crosses. While i (ad × ad) was significant only for grain yield and in only one cross for 100-grain weight. The opposite of sign of h and l indicated the presence of duplicate epistasis. Significant role of dominance variance along with duplicate epistasis in the inheritance of said characters favours the use of research material (maize inbred lines) for the development of single cross hybrids.


Irshad-Ul-Haq M.,Millets Research Station | Ajmal S.U.,Pmas Arid Agriculture University | Munir M.,Pmas Arid Agriculture University | Gulfaraz M.,Pmas Arid Agriculture University
Pakistan Journal of Botany | Year: 2010

The present study was carried out to determine the type of gene action, genetic parameters of yield and other quantitative traits by crossing 8 diverse maize inbred lines in complete diallel fashion. Seed of F1 population along with their parents was planted in randomized complete block design replicated thrice. Analysis of variance showed that inbred lines differed significantly among each other for all traits. The estimates of components of genetic variation revealed that non additive genetic effects were more pronounced in the inheritance of plant height, days to 50% tasseling, days to 50% silking, ear height and grain yield per plant. Directional dominance was observed for all the characters under study. Asymmetrical gene distribution was observed for all the attributes except ear height for which parental lines contained equal number of dominant and recessive genes. The graphic analysis showed that all the characters were under the genetic control of over dominance type of gene action, therefore, the material can easily be exploited for heterotic effect.

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