Indian Society of Genetics & Plant Breeding

Genetic control and heterosis for grain iron and zinc contents in sorghum [Sorghum bicolor (L.) Moench]

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For formulating an appropriate breeding strategy, genetic
control of grain iron (Fe) and zinc (Zn) in sorghum was
studied in a half-diallel mating design with nine parents.
Both additive and non-additive gene actions were
important in the genetic control but dominant gene action
was predominant in case of Fe. In case of grain Zn additive
gene action was more important with a σ² gca/σ² sca ratio
of 0.94. Predictability ratio was 0.14 for grain Fe and 0.65
for Zn. Significant correlation between mean parental
performance and GCA effects (r = 0.86 for Zn, r = 0.67 for
Fe) indicated that selection of genotypes with high mean
Zn and/or Fe levels would be highly effective in selecting
for high GCA.The results suggest the scope for heterosis
breeding to improve grain Fe, while for improving grain
Zn progeny selection in pedigree breeding will be effective.
High Fe and Zn levels in both of the parental lines would
be required to develop heterotic hybrids with high grain
micronutrient contents.

Keywords: Biofortification, gene action, grain iron, grain zinc, micronutrients


Year: 2014
Volume: 74
Issue: Supplementry Issue
Article DOI: 10.5958/0975-6906.2014.00903.1
Print ISSN: 0019-5200
Online ISSN: 0975-6906


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