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University of Khartoum (2005)

Genetic Variability for Yield and Yield Components of Some Maize (Zea mays L.) Genotypes Determined Under Drought at Different Growth Stages

Adam, Elfadil Mukhtar

Titre : Genetic Variability for Yield and Yield Components of Some Maize (Zea mays L.) Genotypes Determined Under Drought at Different Growth Stages

Auteur : Adam, Elfadil Mukhtar

Université de soutenance : University of Khartoum

Grade : Master of Science (MS) 2005

Résumé
This study was carried out during the 2003/04 season at two different locations, Shambat and Medani, Sudan, to determine the genetic variability for yield and yield components of 15 maize (Zea mays L.) genotypes under three water treatments at different growth stages. The design used was split plot design with three replications, in which the water treatments were allocated in the main plots and the genotypes in the sub-plots. Phenotypic and genotypic variance, phenotypic (PCV) and genotypic (GCV) coefficient of variation, heritability (h2), genetic advance (GA), correlations coefficient between the different characters and the correlations between the drought tolerance parameters were determined. The results revealed that highly significant differences (P < 0.01) between water treatments were detected for most of the investigated traits. Significant differences (P < 0.05) between the evaluated genotypes were found for most of the traits. The greatest GCV (13.6%) was recorded for lodging percentage and the lowest one (0.77%) was recorded for ear length. The highest estimates of h2 (69%) obtained for ear diameter and the lowest (11%) for ear length. Furthermore the largest (177.5%) GA was scored by grain yield/ha, while the lowest one (0.06%) was obtained for husk cover. Grain yield/plant exhibited significant positive associations with its components. The genotypes that possess drought tolerance were PR – 2 under drought at vegetative stage, Z – 2 under drought at reproductive stage and M – 45 at both vegetative and reproductive stages. These genotypes could be used further in breeding programs to improve drought tolerance in maize.

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