Indian Society of Genetics & Plant Breeding

Estimation of genetic variance from full-sib and half-sib families in a maize (Zea mays L.) composite

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Sixty four randomly selected So plants (used as males)
were each mated to four different plants (used as females)
to generate 256 full-sib families as per North Carolina
Design-1 for the estimation of genetic components of
variance and related parameters in a large random mating
maize composite Mahidhawal. These 256 full-sib families
were evaluated in an incomplete block design with two
replications in rainfed farming situations under two different
fertility levels. Comparison of the relative magnitude of
the additive genetic variance and variance due to
dominance deviations revealed that the former was more
important for grain yield per plant and its component
traits. Variance due to dominance deviations was affected
more by the environmental interaction as compared to
additive genetic variance. Genes responsible for the
expression of majority of the traits showed no dominance
to partial dominance, indicating that (J2
A was the sole
contributor to total genetic variability. Heritability (narrow
sense) estimates showed that sufficient proportion of
additive genetic variance was available for an effective
selection procedure to be used.

Keywords: Maize composite, additive genetic variance, NC-1 design, heritability (narrow sense)


Year: 2005
Volume: 65
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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