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Genetic Variability, Correlation and Path Analysis in Stem Amaranth (amaranthus Tricolor L.) Genotypes

M. Hasan
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

C. A. Akther
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

M. S. Raihan
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh

Abstract/ Executive Summary:

Seventeen genotypes of stem amaranth (Amaranthus tricolor L.) were evaluated to determine the genetic variability, degree of association between yield and its component characters. The direct and indirect effects of marketable yield were also evaluated. High heritability with high genetic advance as percent of mean was registered for number of leaf, leaf weight and marketable yield which in fact demonstrated the presence of additive gene effects. The correlation studies revealed strong positive association of yield with leaf weight, stem weight, stem diameter, dry weight with rind, and dry weight without rind. The relationship was non-significant and negative at 1^st flowering. The result of path analysis indicated that stem weight had maximum direct effect on marketable yield followed by leaf weight, leaf number and dry weight without rind.

Keywords: Stem amaranth, Heritability, Correlation, Path analysis

Location: The experimental field laboratory, Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur

Start Date: 00-00-2008

End Date: 00-00-2008

Program Area: Variety and Species

Commodity: Amaranth

Objectives:

To find out and establish suitable selection criteria for stem amaranth genotypes through study of genetic variability, heritablility, genetic advance and relationship between marketable yield and its components.

Methodology:

Seventeen genotypes of stem amaranth were grown in a randomized complete block design with three replications at the experimental field laboratory, Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur in 2008. The experimental materials were collected from different agro-ecological regions of Bangladesh. The seeds were sown in the seed bed of 1m × 1m and the seed beds were 50 cm apart from each other. All agronomic and plant protection measures were done as per schedule. Data on yield contributing traits have been recorded from ten randomly selected plants from each genotype in each replication. Data were recorded on first flowering, plant height, leaf number, leaf length, leaf weight, stem weight, stem diameter, dry weight with rind, dry weight without rind and marketable yield. The genotypic and phenotypic variances were calculated. Genotypic and phenotypic co-efficients of variations were computed. Heritability in broad sense was estimated. Genetic advance under selection was calculated by the formula was suggested. Genetic advance in percent of mean was calculated. Simple correlation co-efficients for all possible pair of characters at phenotypic and genotypic levels were done). Direct and indirect effects were worked out using path analysis at genotypic level. The residual effect was calculated.

Source of Information: The Agriculturists 11(1): 1-7 (2013) ISSN 2304-7321 (Online), ISSN 1729-5211 (Print), A Scientific Journal of Krishi Foundation

Article Link (Online Journal): http://www.banglajol.info/index.php/AGRIC/article/view/15235/10799

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The present study was undertaken to estimate the genetic parameters, association of different yield contributing characters and their direct and indirect effects on marketable yield of some stem amaranth genetypes. Additive gene effect was noticed for number of leaf, leaf weight and marketable yield as high heritability with high genetic advance was recorded. Marketable yield exhibited strong positive association with leaf weight, stem weight, stem diameter, dry weight with rind and dry weight without rind. Path analysis indicated that stem weight had maximum direct effect on marketable yield. It would therefore, be rewarding to lay stress on these characters in selection program for increasing marketable yield of the stem amaranth genotypes.

Knowledge Management: Journal