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Genetic Divergence of Indigenous Pummelo Genotypes

Md Sarowar Alam
Scientific Officer
Regional Agricultural Research Station, BARI, Akbarpur, Moulvibazar, Bangladesh.

Md Sultan Mia
Scientific Officer
Regional Agricultural Research Station, BARI, Hathazari, Chittagong, Bangladesh & PhD fellow, School of Plant Biology, University of Western Australia, Perth, WA, Australia.

Md Salim
Scientific Officer
Hill Agricultural Research Station, BARI, Ramgarh, Khagrachari.

Jubair Al Rashid
Executive
R & D, MATEX Bangladesh Ltd. Dhaka, Bangladesh.

Md Saidur Rahman
Senior Scientific Officer
RARS, BARI, Akbarpur, Moulvibazar and PhD fellow, Department of Horticulture, BAU, Mymensingh, Bangladesh.

Abstract/ Executive Summary:

The genetic divergence was studied in 33 pummelo genotypes using D² statistics and principal component analysis at Regional Agricultural Research Station, BARI, Akbarpur, Moulvibazar during 2012 to 2014. The genotypes were grouped into 5 clusters and the maximum number of genotypes was included in cluster IV and V and the minimum number in cluster I. The inter cluster distance in all of the cases were higher than the intra cluster distance indicating wider genetic diversity among the accessions of different groups. The highest inter-cluster distance was observed between cluster I and II followed by cluster II and V and the lowest between III and IV. The highest intra- cluster distance was observed for the cluster II and the lowest for the cluster III. For cluster II, the highest mean values for plant height (6.13m), individual fruit weight (1141.67g), fruit length (13.03 cm) and breadth (13.15 cm), number of segments per fruit (14.41), number and weight of seeds per fruit (123.67 and 50.41g), yield per plant (50.94 kg) were observed. The first axis largely accounted for the variation among the pummelo accessions (26.16%) followed by second axis (18.75%). The first 8 axes accounted 90.56 % of the total variation. The characters individual fruit weight (g) and weight of seeds per fruit (g) showing positive value in both the vectors contributed maximum towards divergence. Considering magnitude of genetic distance, contribution of different traits toward the total divergence, magnitude of cluster means for different traits and performance the genotypes of cluster I, II, and IV may be considered as parents for future hybridization program.

Keywords: Genetic divergence, Cluster analysis, D2 analysis,Pummelo

Location: Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Akbarpur, Moulvibazar.

Start Date: 00-02-2012

End Date: 00-10-2014

Program Area: Variety and Species

Commodity: Pummelo

Objectives:

To understand the nature and magnitude of genetic divergence and the characters contributing genetic diversity by D² analysis.

Methodology:

The experiment was conducted at the pummelo orchard and laboratory of the the Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Akbarpur, Moulvibazar during February 2012 to October 2014.Thirty three pummelo genotypes were included in the present study and data were recorded from three different plants of an accession where each plant was considered as a replication. Individual plants were fertilized with cowdung (20 kg), urea (500 g), TSP (500 g), MP (500 g), gypsum (200 g) , Zinc (4 g), boron (4 g) in two equal installments one at the onset and other at the end of rainy season. Irrigation, weeding and other crop management practices were followed as recommended by Ullah et al . to have a good healthy plant. Data on plant height (m), canopy spreading (m), number of flowers per cluster, number of fruits per plant, individual fruit weight (g), fruit length (cm) and breadth (cm), number of segments per fruit, number and weight (g) of seeds per fruit, edible percentage, % Brix (TSS) and yield per plant(kg)were recorded.

Source of Information: Res. Agric., Livest. Fish.3(1): 37-43, April 2016, ISSN: 2409-0603

Article Link (Online Journal): DOI: http://dx.doi.org/10.3329/ralf.v3i1.27856

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Crosses involving parents belonging to most diverse genotypes are expected to exhibit maximum heterosis and create wide variability in genetic architecture. Considering magnitude of genetic distance, contribution of different traits toward the total divergence, magnitude of cluster means for different traits and performance the genotypes of cluster I, II, and IV may be considered as parents for future hybridization program.

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