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Multivariate Analysis of Divergence in Advanced Lines of Mustard (brassica Spp)

M. A. Zaman
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Hathazari, Chittagong, Bangladesh.

M. Tuhina-Khatun
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Hathazari, Chittagong, Bangladesh.

M. Z. Ullah
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Hathazari, Chittagong, Bangladesh.

M. Moniruzzamn
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Hathazari, Chittagong, Bangladesh.

M. Z. Rahman
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Hathazari, Chittagong, Bangladesh.

Abstract/ Executive Summary:

A field experiment was conducted comprising eighteen advanced lines of mustard in a randomized block design with three replication at Regional Agricultural Research Station, BARI, Hathazari, Chittagong during Rabi season (December 2009 to April 2010) for estimation of divergence among advanced lines of mustard. The genotypes were grouped into four clusters. Cluster I contained the highest number of genotypes (6) and the cluster III contained the lowest (3). The inter-cluster distances in all cases were larger than the intra-cluster distance which indicated that wider diversity was present among the genotypes of distant grouped. The highest intra cluster distance was observed in cluster II and the lowest in I. The highest inter cluster distance was observed between the cluster III and II followed by III and I and the lowest between cluster IV and III. Days to 50% flowering (81.94%), days to maturity (8.24%), plant height (5.82%), branches per plant (1.91%) and siliquae per plant (1.17%) contributed maximum towards the total divergence which suggested that these characters were highly responsible for genetic divergence in the present materials. But the highest cluster means for primary branches per plant and maximum seeds per siliquae with minimum seed yield per plant were obtained from the cluster II. The genotypes from cluster I had dwarf plant along with earliness in days to 50% flowering, days to maturity and maximum number of primary branches per plant. Therefore, the genotypes from cluster I and III could be utilized in the hybridization program for getting desirable transgressive segregants and high heterotic response due to getting maximum yield along with short duration.

Keywords: Multivariate analysis, Divergence,Mustard

Location: BARI, Hathazari, Chittagonj

Start Date: 00-11-2009

End Date: 00-02-2010

Program Area: Variety and Species

Commodity: Mustard

Objectives:

To estimate the nature and magnitude of genetic diversity present in a collection of 18 advanced lines of mustard.

Methodology:

An experiment comprising 18 mustard genotypes was conducted in a randomized block design with three replication at Regional Agricultural Research Station, BARI, Hathazari, Chittagong during Rabi season November 2009 to February 2010. The unit plot size was six rows of 4 meter length. The inter row to row and plant to plant spacing were maintained at 30 cm and 5 cm, respectively. Recommended fertilizer doses, cultural practices and all plant protection measures were followed to ensure a good crop. The data on nine morphological characters namely days to 50% flowering, days to maturity, plant height (cm), number of primary branches per plant, number of siliquae per plant, number seeds per siliquae, 1000 seeds weight (g), seed yield per plant (g) and seed yield per hectare (kg) were recorded. Genetic diversity were studied following Mahalanobis (1936) generalized distance (D²) extended by Rao (1952). Based on the D²values, the studied genotypes were grouped into clusters according to the Tocher’s method (Rao, 1952). The methods of Singh and Chowdhury (1985) were used for calculating the intra and inter cluster distances. Statistical analysis were carried out by Genstat Discovery edition 3.

Source of Information: Bangladesh J. Pl. Breed. Genet., 23(2): 29-34, 2010

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The analysis of variance and dispersion showed highly significant variations among the different genotypes for all the eight characters under study, which revealed the presence of considerable variability among the genotypes. The eighteen genotypes were grouped into four clusters using the closer genetic distance in such a way that the genotypes within the cluster had smaller D² values among themselves than those belonging to different clusters. Pattern of distribution of genotypes among various clusters reflected the considerable genetic variability present in the genotypes under study. The maximum number of genotypes (6) were comprised into cluster I followed by five in cluster IV. The minimum genotypes (3) comprised into cluster II. The Brassica campestris genotypes were grouped into cluster I and II whereas the Brassica juncea genotypes were grouped into cluster III and IV respectively, which indicated that genotypes of quite different pedigree may fall into the same cluster, due to unidirectional selection pressure that could yield the genotypes, which were genetically closer than their parents. This was due to homogeneity in parental sources. Similar results were found in case of Brassica juncea. The D² analysis showed intra and inter-cluster distance.The inter-cluster distances in all cases were larger than the intra-cluster distance which indicated that wider diversity was present among the genotypes of distant grouped.

Knowledge Management: Journal