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Variability, Character Association and Diversity Analysis of Ridge Gourd (luffa Acutangula Roxb.) Genotypes of Bangladesh

M. G. Rabbani
Department of Horticulture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. J. Naher
Department of Horticulture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

S. Hoque
Department of Horticulture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Sixty genotypes of ridge gourd (Luffa acutangula Roxb.) were collected from sixteen locations in four major divisions of Bangladesh and were used to study their variability, character association and genetic diversity. Seventeen traits studied, of these, eight showed high heritability (over 80%). Correlation coefficient study indicated that yield per plant had highly significant positive relationship with the number of fruits per plant (r = 0.874**), average fruit weight (r = 0.707**), vine length at harvest (r = 0.359**) and length of fruit (r = 0.334**). On the other hand, the sex ratio and circumference of fruit exhibited negative association with yield. Path co-efficient analysis showed that number of fruits per plant exhibited the highest positive direct effect (0.7192) on yield followed by average fruit weight (0.4656). Based on Mahalanobis’ D² statistics, the sixty genotypes were grouped into four different clusters. Clustering pattern revealed that genotypes collected from the same location were grouped into different clusters. The average intercluster distances were always higher than the average intracluster distances suggesting wider genetic diversity among the genotypes within the cluster. Custer-III had the highest intracluster distance (97.9).

Keywords: Variability, Character association, Ridge gourd, Diversity analysis.

Location: Sixteen locations which represent four major divisions of Bangladesh

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Ridge gourd

Objectives:

To assess the variability among the 60 genotypes of ridge gourd collected from different parts of Bangladesh for yield and yield contributing characters, their interrelationship and genetic diversity through biometrical procedures.

Methodology:

A total of 60 ridge gourd landraces were used in this study. The materials were collected from 16 locations which represent four major divisions of Bangladesh. The experiment was laid out in the Randomized Complete Block Design (RCBD) with three replications. One accession represented one treatment and three plants in an accession represented one replication. Data on seventeen characters covering stem, leaf, flower, fruit and seeds were recorded from the studied plants. Computation of the data was carried out using MSTAT-C program. Genotypic and phenotypic coefficient of variation was calculated. Heritability was estimated. Simple correlation co-efficient was worked out. Path coefficient analysis was carried out following the procedure using simple correlation values. Analysis of genetic divergence was done statistics.

Source of Information: SAARC JOURNAL OF AGRICULTURE, Vol. 10, Issue 2, 2012, pp. 01-10,ISSN 1682-8348,SAARC Agricultural Information Centre.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Clustering pattern of the genotypes revealed that the accession collected from the same region did not fall in a single cluster. This result indicated that factors other than geographical separation are also responsible for divergence, and the genotypes that have originated from the same place might have different genetic architecture or vice-versa. The genetic diversity should be utilized for the development of gene pools, which serve as the reservoirs of genes. Information on genetic diversity can also be utilized for the exploitation of hybrid vigor. Morphological approach to explore variation and divergence is more conventional method with several limitations and influenced by environmental factors. So, to get more accurate results, molecular approach using RAPD, RFLP, SSR are suggested for identification of individual accession to avoid duplication in conservation of the germplasm for future use as well as to study genetic study in ridge gourd (L. acutangula).

Knowledge Management: Journal