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Genetic variability for grain yield and some grain quality characters and genetic correlation among these traits in white and yellow maize (Zea mays L.) populations
Dissertation Abstract:
Genetic variabilities for grain yield and other agronomic traits were determined in white (IPB Var6) and yellow (IPB Var13) maize populations using 100 half sibgenerated by nested genetic design or Design I and 100 S1 families.
Significant genetic variabilities were observed for all traits in both sets of families in each population. However, in the Design I materials wherein it was possible to separately estimate additive and dominance variabilities, it was only the dominance variability that was significant for grain yield in both populations. This means that it may not be possible to improve those populations by half-sib selection.
Grain nutritional quality traits were also analyzed in some of the general half-sib and S1 families, namely: total starch, amylose, amylopectin, and lysine contents in the white variety and total carotenoid and beta carotene in the yellow population. Additive and dominance variabilities were highly significant in all the grain quality traits studied in both sets of families in each population.
Genetic (additive) correlations were also determined between the grain quality traits and grain yield in the Design I materials and were found not significant. This non-significance of additive genetic variability in the half-sib families could be the reason for the non-significant genetic correlation. It is recommended that more maize populations be studied to confirm this lack of genetic relationship between grain yield and quality traits.