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Estimation of Genotypic and Phenotypic Variability in Maize

S. C. Debnath
Department of Genetics Plant Breeding Bangladesh Agricultural University Mymensingh

Abstract/ Executive Summary:

Estimates of genotypic and phenotypic variability, heritability and genetic advance were obtained for grain yield and some other agronomic traits in 19 genotype of maize. The genotypes differed significantly for all characters except 1000-kernel weight. Highest genotypic coefficient of variation was observed in ear height followed by grain yield. Heritability estimates were high for plant height (84.23%); ear height (81.29%) and kernel rows per ear (80.60): medium for number of kernels per row (65.07%), ear diameter (65.00%) and grain yield (53.10%); and low for ear length (38.06%), number of ears (29.69%) and 1000-kernel weight (21.70%). Highest genetic advance expressed as percentage of mean was revealed by ear height, while 1000-kernel weight exhibited the lowest value. Selection for ear height was proposed to be much more effective than for other characters.

Keywords: Variabilitv , Heritability, Maize

Location: Bangladesh Agricultural University Farm, Mymensingh

Start Date: 00-00-1983

End Date: 00-00-1984

Program Area: Variety and Species

Commodity: Maize

Objectives:

To determine the genetic parameters like variability, heritability and genetic advance for genetic improvement in maize.

Methodology:

Nineteen maize genotypes collected from different sources were grown in a randomized block design with three replications during winter season of 1983-84 at the Bangladesh Agricultural University Farm. Mymensingh. Each entry was represented by a single row of 5m length. The spacing was kept 75 and 25cm between and within the lines. Data were collected from ten randomly selected plants on grain yield (g), plant height (cm), ear height (cm), number of ears, ear length (cm), ear diameter (cm), kernels per ear, number of kernels per row and 1000 kernel weight (g) on per plant basis. Mean data were analysed for variance and subsequent estimation of genotypic and phenotypic variances. Genotypic and phenotypic coefficients of variation, heritability in broad sense and genetic advance were estimated.

Source of Information: Bangladesh J. Agril. Sci. 16 (1) : 79-82: 1989 , ISSN 0379-4296

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The genotypes differed significantly for all characters except 1000-kernel weight. Highest genotypic coefficient of variation was observed in ear height followed by grain yield. Heritability estimates were high for plant height (84.23%); ear height (81.29%) and kernel rows per ear (80.60): medium for number of kernels per row (65.07%), ear diameter (65.00%) and grain yield (53.10%); and low for ear length (38.06%), number of ears (29.69%) and 1000-kernel weight (21.70%). Highest genetic advance expressed as percentage of mean was revealed by ear height, while 1000-kernel weight exhibited the lowest value. Selection for ear height was proposed to be much more effective than for other characters.

Knowledge Management: Journal