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Genetic Diversity in Mango (mangifera Indica L.) Through Multivariate Analysis

D. A. N. MAJUMDER
Manager
Plant Biotechnology Laboratory, BRAC Agricultural Research and Development Centre, Gazipur

L. HASSAN
Professor
Dept. of Genetics and Plant Breeding, Bangladesh Agricultural University (BAU), Mymensingh,

M. A. RAHIM
Professor
Dept. of Horticulture, BAU, Mymensingh,

M. A. KABIR
Professor
Dept of Horticulture, Hajee Mohammad Danesh Sci. & Tech. University, Dinajpur-5200, Bangladesh.

Abstract/ Executive Summary:

The genetic divergence was assessed in 60 mango genotypes through D² - statistics and principal component analysis. The genotypes under study were grouped into eight clusters and the diversity was influenced by the morphological characters, not by the geographical distribution of the genotypes. The clustering pattern revealed that the genotypes collected from the same region did not fall in the single cluster. The maximum inter cluster distance was noticed between cluster II and cluster VIII, and the lowest between clusters VII and cluster VIII. From the cluster means, cluster I was high yielding and ranked first in terms of number of secondary branches per inflorescence, percent fruit set per inflorescence, and yield per plant. Cluster VIII had only one genotype which produced the highest percentage of flowering shoots, % perfect flowers, number of fruits per plant, and %TSS. The genotypes of cluster VII produced the biggest sized fruits. The first nine characters of the principal component axes with eigen values above unity accounted for 88.3% of the total variation among the fifteen characters. Weight of harvested fruits per plant (0.990 and 0.181), number of fruits per plant (0.101 and 0.607) and individual fruit weight (0.027 and 0.107) for both the vectors were positive across two axes indicating the important components of genetic divergence. The genotypes belonging to clusters I, VII and VIII with high to moderate genetic distances might be recommended for use in crossing programs to produce new recombinants with desired traits.

Keywords: Genetic diversity, Multivariate analysis, Cluster analysis, and Mango.

Location: Mango orchard of BAU Germplasm Centre, Department of Horticulture, Bangladesh Agricultural University, Mymensingh

Start Date: 00-07-2006

End Date: 00-12-2008

Program Area: Variety and Species

Commodity: Mango

Objectives:

the objective of the study was to find out the genetic diversity and pattern of variation present among the collected germplasm of mango.

Methodology:

The study was conducted on the pre-established mango orchard of BAU Germplasm Centre, Department of Horticulture, Bangladesh Agricultural University, Mymensingh during the period of December to July 2006-2007 and 2007-2008. This study was conducted with 60 mango genotypes in RCBD with three replications. One genotype represented one treatment and five plants in a genotype represented one replication. The distance from plant to plant was 5m and row to row was 5m. Normal recommended cultural practices were adopted during experimentation. Data were recorded on fifteen important parameters. Genetic diversity was estimated using Mahalanobi’s D2 -statistics (Mahalanobis, 1936) extended by Rao (1952). Tocher’s method was followed to determine group constellation. Canonical vitiate analysis was also performed as per Rao (1964) to confirm the results of cluster and D2 - analysis. The data were analysed using Genstat 5 (Release 4.1) and Microsoft Excel 2000 software.

Source of Information: Bangladesh J. Agril. Res. 38(2): 343-353, June 2013 ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The genotypes belonging to clusters I, VII and VIII with high to moderate genetic distances might be recommended for use in crossing programs to produce new recombinants with desired traits.

Knowledge Management: Journal