Indian Society of Genetics & Plant Breeding

Genotype × environment interactions for grain micronutrient contents in sorghum [Sorghum bicolor (L.) Moench]

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Assessment of the stability of grain iron (Fe) and zinc (Zn)
content across growing regions is a pre-requisite in
breeding for micronutrient enrichment in grains. Grain Fe
and Zn contents were estimated in a set of 10 sorghum
genotypes grown at six locations.The Fe and Zn in grain
ranged from 28.9-34.9 mg/kg and 20.4-25.7 mg/kg,
respectively, across the locations. Significant genotype ×
environment (G × E) interactions were observed for both
grain Fe and Zn, indicating differential nutrient
accumulation by the genotypes. Additive main effects and
multiplicative interaction (AMMI) analysis indicated that
the first two principal components were significant and
contributed more than 75% of G × E sum of squares.
Though environment (linear) variance was significant
indicating linear sensitivity, significant pooled deviation
for both the traits suggested that expression in some of
the genotypes fluctuated significantly from their
respective linear path of response to environments. The
study shows the necessity of multi-location as well as
multi-season evaluation of genotypes for identifying stable
donors that can be used in breeding programmes for
micronutrient enrichment.

Keywords: Grain iron, grain zinc, micronutrients, sorghum


Year: 2012
Volume: 72
Issue: 4
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906


V. Agte info_circle
Prabhakar and J. V. Patil info_circle

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