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Genetic Divergence in Rapeseed-mustard (brassica Rapa L.)

M. H. KHAN
Oilseed Research Centre, BangladeshAgricultural Research Institute (BARI)

M. M. ALI
Oilseed Research Centre, BangladeshAgricultural Research Institute (BARI),

S. R. VHUIYAN
Professor
Dept. of Genetics & PlantBreeding, Sher-e- Bangla Agricultural University (SAU), Dhaka, Bangladesh.

F. MAHMUD
Professor
Dept. of Genetics & PlantBreeding, Sher-e- Bangla Agricultural University (SAU), Dhaka, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted at the experimental farm of Sher-e-Bangla Agricultural University, Dhaka, during November 2009 to February 2010 to study the genetic divergences of 32 genotypes of Brassica rapa L. through principal component analysis and Mohalanobis D2 analysis. Analysis of variance indicated that considerable genetic variability were existed among the 32 genotypes. On the basis of D2 analysis, the genotypes were grouped into 6 clusters. Cluster III had the maximum number of 11 genotypes, while the cluster IV and cluster V had only 2 genotypes each. The highest inter-cluster distance was observed between cluster I and V (21.871), while the lowest in the cluster II and III (4.237). The intra cluster distance was the maximum in cluster V (0.469) and minimum in cluster III (0.116). The characters yield per plant, number of siliquae per plant, and days to maturity were found prominent towards the genetic divergence. The genotypes G-15 and G-19 from cluster IV and G-1, G- 3, G-4, G-10, G-18, and G-24 from cluster I were suitable for creating more variability for higher yield per plant through hybridization

Keywords: Genetic divergence, Rapeseed-mustard, Brassica rapa L.

Location:

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Mustard

Objectives:

The present investigation was carried out to determine the divergence among the different genotypes of rapeseed-mustard.

Methodology:

The present experiment was conducted at the experimental farm of Sher-e-Bangla Agricultural University, Dhaka, during November 2009 to February 2010. A total of 32 rapeseed-mustard germplasm along with two released varieties were used in the experiment. The crop was fertilized at the rate of 10 tons of cowdung, 250 kg Urea, 175 kg Triple Super Phosphate (TSP), 85 kg Muriate of Potash (MoP), 250 kg Gypsum, 3 kg Zinc oxide and 1 kg Boron per hectare. The half amount of urea, total amount of cowdung, TSP, MoP, Gypsum, Zinc Oxide, and Boron were applied during final land preparation. The rest amount of urea was applied as top dressing after 25 days of sowing. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. The spacing between line to line 30 cm was maintained. Intercultural operations, such as weeding, thinning, irrigation, pest management, etc. were done uniformly in all the plots when necessary. For studying different genetic parameters and inter-relationships, ten characters were taken into consideration from the randomly selected ten plants. Mean data of each character was subjected to multivariate analysis viz, Principal Component Analysis (PCA), Principal Coordinate Analysis (PCO), Canonical Vector Analysis (CVA), and Cluster Analysis (CLA) using Genstat released 13 Programme by a IBM Computer following the method of multivariate analysis of Mohalanobis, 1936.

Source of Information: Bangladesh J. Agril. Res. 38(3): 417-423, September 2013 ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

the parents in the cluster V if crossed with Cluster I and II might exhibit heterosis as well as higher level of genetic variation. The crosses involving parents belonging to intermediate diverse parents may also have chance to produce significant and positive heterosis in the subsequent generations. Considering the magnitude of genetic distance, contribution of different characters towards the total divergence, magnitude of cluster means for different characters and field performance, the genotypes G-15 and G-19 from cluster IV and G-1, G-3, G-4, G-10, G-18 and G-24 from cluster I may be suitable for creating higher yield per plant through hybridization which will eventually offer more scope of selection of plants with higher per plant yield.

Knowledge Management: Journal