GENETIC VARIABILITY, HERITABILITY AND GENETIC GAIN POTENTIAL FOR YIELD TRAITS IN MAIZE (Zea mays L.)
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Authors
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P KIREETI VARMA
Department of Genetics and Plant Breeding, Agricultural College, Bapatla - 522101 Acharya N.G. Ranga Agricultural University, Lam, Guntur, Andhra Pradesh, India
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I SUDHIR KUMAR
Department of Genetics and Plant Breeding, Agricultural College, Bapatla - 522101 Acharya N.G. Ranga Agricultural University, Lam, Guntur, Andhra Pradesh, India
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K R YATHISH
Department of Genetics and Plant Breeding, Agricultural College, Bapatla - 522101 Acharya N.G. Ranga Agricultural University, Lam, Guntur, Andhra Pradesh, India
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P MUNIRATNAM
Department of Genetics and Plant Breeding, Agricultural College, Bapatla - 522101 Acharya N.G. Ranga Agricultural University, Lam, Guntur, Andhra Pradesh, India
Keywords:
Genetic Variability, GCV, Genetic Advance, Heribility, Maize, PCVAbstract
The present study was undertaken to evaluate the extent of genetic variability, heritability,
and genetic advance for yield and component traits in seventy maize (Zea mays L.) inbred lines.
The genotypes were assessed during rabi 2024–25 at two locations—ARS, Peddapuram and
WNC, ICAR-IIMR, Rajendranagar—using an alpha-lattice design with two replications. The analysis
of variance revealed highly significant differences among the inbred lines for all traits investigated,
confirming the presence of substantial genetic variability. In the pooled analysis, high genotypic
and phenotypic coefficients of variation were recorded for anthesis–silking interval, 100-kernel
weight and grain yield per plant, indicating a strong scope for selection and the involvement of
both additive and non-additive gene effects. Moderate variability was observed for plant height,
ear height, ear length and number of kernels per row, whereas the remaining traits expressed
comparatively low variability. Furthermore, high heritability coupled with high genetic advance as
a percentage of the mean for plant height, ear height, ear length, number of kernels per row,
100-kernel weight and grain yield per plant suggests the predominance of additive gene action,
thereby enabling effective improvement through direct selection. These findings provide a strong
foundation for identifying promising parental lines and advancing yield-oriented maize breeding
programmes.
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