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Genetic Diversity Analysis in Some Advanced Lines of Brassica Napus

Firoz Mahmud
Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Md. Golam Rasul
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Majibur Rahman Agricultural University, Gazipur, Bangladesh

Md. Abdur Rahim
Department of Genetics and Plant Breeding, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Abstract/ Executive Summary:

The genetic diversity of 22 rapeseed (Brassica napus) advanced genotypes was studied using principal component analysis, non-hierarchical clustering, and canonical vector analysis. The genotypes were grouped into four clusters. Cluster II contained the maximum number of genotypes (9) and cluster III contained the lowest (2). The highest inter-cluster distance was found between cluster I and cluster III and the lowest between cluster I and cluster II. The highest intra-cluster distance was noticed for cluster III and the lowest for cluster II. Cluster I had the highest mean values for siliqua length and thousand seed weight. Cluster III had the lowest cluster mean values for the number of days to 50% flowering and the number of days to maturity with moderate seed yield. Crosses between genotypes belonging to cluster II with those of cluster I and cluster IV might therefore produce high heterosis in yield as well as earliness.

Keywords: Genotype Cluster, Rapeseed, Heterosis .

Location: Experimental farm of Bangabandhu Sheikh Majibur Rahman Agricultural University, Gazipur, Bangladesh

Start Date: 00-00-2006

End Date: 00-00-2006

Program Area: Variety and Species

Commodity: Mustard

Objectives:

To analyse genetic diversity among 22 advanced genotypes of B. napus.

Methodology:

Twenty two advanced genotypes of B. napus were grown in randomized complete block design with three replications at the experimental farm of Bangabandhu Sheikh Majibur Rahman Agricultural University, Gazipur, Bangladesh during the winter of 2006. The genotypes were collected from the Department of Genetics and Plant Breeding, Bangabandhu Sheikh Majibur Rahman Agricultural University. The plot size was 4 rows of 3 m width. A distance of 1.5 m from block to block, 30 cm from row to row, and 10 cm from plant to plant was maintained. The fertilizers urea, triple super phosphate, muriate of potash, gypsum, and zinc sulphate were applied in quantities of 270, 170, 100, 150, and 5 kg/ha, respectively, along with 10 t/ha of cow dung. With the exception of half of the urea, the cow dung and fertilizers were applied at the time of final land preparation. The remaining urea was top dressed 30 days after seedling emergence. The standard agronomic practices were maintained to raise a healthy crop. Data on 10 randomly selected plants from each plot were recorded on 11 characters viz., days to 50% flowering, days to 80% maturity, plant height, number of primary branches per plant, number of secondary branches per plant, inflorescence length, siliqua length, number of siliquae per plant, number of seeds per siliqua, thousand seed weight, and grain yield per plant. The data were subjected to principal component analysis and tested with the D2- statistic using GENESTAT 5, Release 4.1.

Source of Information: ScienceAsia 34 (2008): 432–434, doi: 10.2306/scienceasia1513-1874.2008.34.432

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

the maximum amount of heterosis is manifested in cross combinations involving genotypes from the most divergent clusters. Genotypically distant parents are able to produce higher heterosis. However, for a practical plant breeder, the objective is not only high heterosis but also to achieve a high level of production. In the present study, the maximum distance occurred between cluster I and III. Considering this, it appears that the crosses between the genotypes belonging to cluster III with those of clusters I and IV might produce high heterosis in yield as well as earliness.

Knowledge Management: Journal