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Genetic Diversity of Rapeseed (brassica Napus L.) Genotypes in Bangladesh

S. D. Joya
Department of Genetics and Plant Breeding Bangladesh Agricultural University, Mymensingh 2202, Bangladesh.

A. K. M. Shamsuddin
Department of Genetics and Plant Breeding Bangladesh Agricultural University, Mymensingh 2202, Bangladesh.

U. K. Nath
Department of Genetics and Plant Breeding Bangladesh Agricultural University, Mymensingh 2202, Bangladesh.

Abstract/ Executive Summary:

Genetic diversity in thirty eight traditional rapeseed genotypes was studied under favorable condition through Mahalanobis D² statistic for yield and yield contributing characters. The genotypes were grouped into five clusters. The inter-cluster distances were higher than intracluster distances indicating wider genetic diversity among the clusters. The intra-cluster distances were lower in all the cases reflecting homogeneity of the genotypes within the clusters. Among the different cluster the genotypes of the cluster IV, III and I included were taller plant. The genotypes in the cluster III and IV had large size raceme. The genotypes in the cluster IV, III and V exhibited comparatively higher number of siliqua per raceme. Longer siliqua was noticed for the genotypes in the cluster III, IV and I. Higher number of seeds per siliqua noticed in clusters I, II and III. The genotypes of the cluster I and II produced bold size seed. The genotypes in the cluster V and I had high harvest index. The genotypes of the cluster III and I produced high seed yield per plant. Among the different cluster, the cluster III included the genotypes which had high yield, higher number of seeds per siliqua, longer siliqua, siliqua number per raceme and high plant height. Moreover these cluster displayed wide divergence with the genotypes of cluster V. The genotypes of the cluster V had the highest harvest index therefore selection of the parental material for crossing program for improvement of yield in rapeseed is suggested from these two clusters.

Keywords: Rapeseed, Genetic diversity, D2 statistics, cluster analysis, Mustard

Location: Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh.

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Mustard

Objectives:

This study was undertaken to assess the extent of genetic diversity in 38 traditional Brassica napus L. genotypes. This will help in classifying those into clusters to select genotypes as prospective parents to develop transgressive segregant which will be ultimately used for developing modern variety

Methodology:

The experiment was conducted with 38 genotypes of rapeseed in the experimental farm of the Department of Genetics and Plant Breeding, Bangladesh Agricultural University, Mymensingh. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Five plants were selected randomly from each plot for collection of data for yield and yield contributing characters viz. plant height, raceme length, siliqua per raceme, siliqua length, seeds per siliqua, 1000 seed weight, harvesting index and yield/plants. The data were analyzed following principal component analysis (PCA) and Mahalanobis's (1936) generalized distance (D²) extended by Rao (1952). Intra and inter cluster distances were calculated by the methods of (Singh,2000). All statistical analyses were carried out using MSTATC.

Source of Information: Bangladesh J. Pl. Breed. Genet., 30(2): 29-34, 2017

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present investigation on genetic diversity of rapeseed genotypes indicated a scope for improvement of grain yield through selection. Genetic diversity in thirty eight traditional rapeseed genotypes was studied under favourable condition to assess the extent of genetic diversity which helps in classifying those into clusters to select genotypes as prospective parents to develop transgressive segregant that will be ultimately used for developing modern variety of rapeseed. Higher inter-cluster distances indicating indicating wider genetic diversity among the cluster also lower intra-cluster distances reflecting homogeneity of the genotypes within the clusters. In this study, the genotypes were grouped into five clusters. Among the different cluster the genotypes of the cluster IV (Bari sarisha-10, Bari sarisha-11, Bari sarisha-2, Bari sarisha-5, Nap-206, Nap-248, BC5897, BARI-8 Bari sarisha-13) III (Nap0763, Nap-0721-1, Nap-0758-2, Bari sarisha-8, Bina sarisha-3, Nap-0842-2, Nap-0824, Bina sarisha-5, Nap-0529)and I (Bina sarisha-14, Safal, Bina sarisha-6, Bari sarisha-7, Nap-0757, 2 Nap-0957, Nap-0751, Nap-0726-2, Nap-0724-2, Nap-0760, Nap-0838, Bari sarisha-12, Agrani, Nap-0741-1) included were taller plant. The genotypes in the cluster III and IV had large size raceme. The genotypes in the cluster IV, III and V exhibited comparatively higher number of siliqua per raceme. Longer siliqua was noticed for the genotypes in the cluster III, IV and I. Higher number of seeds per siliqua noticed in clusters I, II and III. The genotypes of the cluster III and I produced high seed yield per plant. Among the different cluster, the cluster III included the genotypes which had high yield, higher number of seeds per siliqua, longer siliqua, siliqua number per raceme and high plant height. The genotypes of the cluster I and II produced bold size seed. The genotypes in the cluster V and I had high harvest index. Moreover these cluster displayed wide divergence with the genotypes of cluster V. The genotypes of the cluster V had the highest harvest index therefore selection of the parental material for crossing program for improvement of yield in rapeseed is suggested from these two clusters.

Knowledge Management: Journal