Indian Society of Genetics & Plant Breeding

G × E interaction studies in relation to heterosis and stability of grain yield in maize (Zea mays L.)

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Interaction of homozygous inbreds and heterozygous
single, three way and double crosses with environment
had shown a differential response in achieving yield
stability. Seven diverse maize inbreds, their 21 single crosses
and 105 each of three way and double crosses obtained
through diallel were evaluated for twelve characters across
three diverse locations to estimate comparative stability of
homozygous and heterozygous genotypes for grain yield.
Contrasts in heterobeltiosis, combining ability and stability
parameters in three environments and interaction effects
were observed. Gain in heterobeltiosis (%) for grain yield
was observed with decreased environmental quality in
different hybrid classes suggesting that heterozygous
hybrids are more stable due to individual buffering in single
crosses and both individual and population buffering in
case of three way and double crosses. Significant increase
in SCA effects was observed in moderate environment at
Hyderabad rather than at high yielding environment Palem.
Significant G × E and Environment (linear) in all the crosses
was observed for grain yield suggesting the effect of
environment and its pre dominant effect on grain yield.
Stability of hybrids was attributed to their superior
performance over the parents in low yielding environment.
Thus the potential use of selected heterozygous hybrids
would allow under diverse environments is suggested to
mitigate losses arising out of climate change.

Keywords: Maize, heterosis × environment, stability, genotype × environment, interaction, heterobeltiosis.


Year: 2020
Volume: 80
Issue: 3
Article DOI: 10.31742/IJGPB.80.3.3
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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