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Genetic Diversity Analysis in Brassica Rapa Using Morphological Characters

N. JAHAN
Scientific Officer
Plant Breeding Division, RARS, Rahmatpur, Barisal

S. R. BHUIYAN
Professor
Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University (SAU), Dhaka

M. Z. A.TALUKDER
Scientific Officer
Plant Breeding Division, BARI, Gazipur

M. A. ALAM
Scientific Officer
RARS, Ishurdi

M. PARVIN
Department of Genetics and Plant Breeding, SAU, Bangladesh.

Abstract/ Executive Summary:

A field experiment was conducted in the experimental field of Genetics and Plant Breeding Department, Sher-e Bangla Agricultural University, Dhaka, Bangladesh to study on genetic diversity in 10 F4 lines obtained through intervarietal crosses along with 8 released varieties of Brassica rapa during November 2007 to February 2008. Different Multivariate analyses were performed to classify 18 genotypes. All the genotypes were grouped into four clusters. Cluster IV was the largest comprising of 7 genotypes and cluster II was the smallest with 2 genotypes. Cluster II had the highest intra-cluster distance and Cluster I had the lowest intra cluster distance. Inter cluster distance was maximum (11.697) between clusters II and III. The results revealed that genotypes chosen for hybridization from clusters with highest distances would give high heterotic F1 and broad spectrum of variability in segregating generations. The characters- number of primary branches/plant, number of secondary branches/plant and days to 50% flowering contributed maximum towards divergence among Brassica genotypes. Considering cluster distance, inter genotypic distance and other agronomic performance G2 and G14 from cluster I; G18 from cluster II; G1, G9 and G12 from cluster III and G16 and G17 from cluster IV may be considered as better parents for future uses in hybridization program.

Keywords: Brassica rapa, Morphological characters, Genetic diversity.

Location: Sher-e Bangla Agricultural University (SAU), Dhaka

Start Date: 00-11-2007

End Date: 00-03-2008

Program Area: Variety and Species

Commodity: Mustard

Objectives:

To analyze the genetic divergence of 18 genotypes of Brassica rapa.

Methodology:

A field experiment was conducted in the experimental field of Genetics and Plant Breeding Field Laboratory of Sher-e Bangla Agricultural University (SAU), Dhaka, Bangladesh during the period from November 2007 to March 2008. Eighteen genotypes were used in the study .The seeds of 18 genotypes were collected from Brassica Breeding Project of SAU, Dhaka-1207, Bangladesh. The seeds of parents and F4 materials were grown following Randomized Complete Block Design (RCBD) with three replications. The size of the plot was 5 m × 25 m. Seeds were sown in lines in the experimental plots on 11th November 2007 by hand uniformly. Manure and fertilizer were applied @ 250 kg urea, 170 kg TSP, 85 kg MP, 150 kg gypsum, and 60 kg borax per hectare. The entire amount of TSP, MP, gypsum, and borax were applied during the final preparation of land. Urea was applied in two equal installments before sowing and flowering. Thinning and gap filling, weeding and mulching, irrigation, other intercultural operations and plant protection measures, etc. were done as and when needed. Data were recorded on selected characters viz., plant height (cm), no. of primary branches/plant, no. of secondary branches/plant, days to 50% flowering, days to maturity, siliquae/plant, siliqua length, seeds/pod, 1000-seed weight and yield/plant from randomly selected plant. Genetic diversity was worked out following Mahalanobis’s (1936) generalized distance (D² ) extended by Rao (1952). Clustering of genotypes was done according to Tocher’s method (Rao, 1952). All the statistical analyses were done using GENSTAT5 programme.

Source of Information: Bangladesh J. Agril. Res. 38(1): 11-18, March 2013, ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Cluster IV was the largest comprising of 7 genotypes and cluster II was the smallest with 2 genotypes. Cluster II had the highest intra-cluster distance and Cluster I had the lowest intra cluster distance. Inter cluster distance was maximum (11.697) between clusters II and III. The results revealed that genotypes chosen for hybridization from clusters with highest distances would give high heterotic F1 and broad spectrum of variability in segregating generations. The characters- number of primary branches/plant, number of secondary branches/plant and days to 50% flowering contributed maximum towards divergence among Brassica genotypes. Considering cluster distance, inter genotypic distance and other agronomic performance G2 and G14 from cluster I; G18 from cluster II; G1, G9 and G12 from cluster III and G16 and G17 from cluster IV may be considered as better parents for future uses in hybridization program.

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