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Assessment of Genetic Diversity in Grasspea (lathyrus Sativus L.) Genotypes Using Morphological Markers

S. Rahman
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur, Bangladesh

M.R. Molla
Plant Genetic Resources Centre, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

M.A.N. Nazim-ud-Dowla
Plant Genetic Resources Centre, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

M.G. Rasul
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur, Bangladesh

M.A.K. Mian
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur, Bangladesh

Abstract/ Executive Summary:

Genetic diversity is very important factor for any hybridization program aiming at genetic improvement of yield especially in self pollinated crops. It is widely accepted that information about germplasm diversity and genetic relatedness among elite breeding material is a fundamental element in plant breeding. Genetic variation was evaluated in twenty five grasspea genotypes for thirteen morphological traits through analysis of variance and multivariate analysis. The analysis of variance for all the characters revealed highly significant variation among the genotypes of grasspea except for days to 50% fruiting. BD 3618, BD 3620 and BD 3621 were found as superior on the basis of the mean performance of desirable traits. The genotypes were grouped into five clusters through principal component analysis (PCA). A total of 84.58% variation was observed from PCA against first thirteen eigen values while only first two values were responsible for 53.25% variation. The inter cluster distance was maximum (17.038) between the cluster V and III and the lowest (2.6) distance between IV and I. Considering cluster mean, the genotypes of cluster III might be selected as a suitable parent for future hybridization programme. The highest inter genotypic distance was observed between BD 3621-BD 3686 that have separate cluster. Contribution of characters towards divergence obtained from canonical variate analysis. The value of Vector I and Vector II revealed that both Vectors had positive values for Plant height, Pods/Plant and Seed Yield/ Plant indicating the highest contribution of these traits towards the divergence among 25 genotypes of grasspea genotypes.

Keywords: Genetic diversity, Grasspea, Multivariate Analysis

Location: The experiment was carried out at the experimental farm of Bangabandhu Sheikh Mujibur experimental farm of Bangabandhu Sheikh Mujibur

Start Date: 00-12-2008

End Date: 00-10-2009

Program Area: Variety and Species

Commodity: Grasspea

Objectives:

To reveal genetic diversity in morphological traits of Grasspea.

Methodology:

The soil type of experimental field belongs to the Shallow Red Brown Terrace type under Salna Series of Madhupur Tract of Agro Ecological Zone (AEZ) 28 that is characterized by silty clay with pH value of 6.5. The climate of the experimental site is subtropical in nature. The experiment was conducted using 25 grasspea genotypes collected from the Plant Genetic Resource Centre, Bangladesh Agricultural Research Institute.

Data were collected from 10 randomly selected plants of each accession of each replication on days to first flowering, days to 50% flowering, days to first fruiting, days to 50% fruiting, branches per plant, plant height (cm), 1000-seed weight (g), seeds per pod, pods per plant, seeds per plant, pod length, pod width and seed yield/plant.

All the collected data of the present study were statistically analyzed. The statistical analysis for various characters under investigation were done and the analysis of variance for each of the characters was performed by F test and mean values were separated by LSD method. Multivariance analysis was also performed that includes principal component analysis (PCA), principal coordinate analysis (PCO), cluster analysis (CLSA), canonical variate analysis (CVA), computation of average intra-cluster distances, computation of average inter-cluster distances and cluster diagram.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Contribution of characters towards divergence obtained from canonical variate analysis. Both Latent vectors had positive values for plant height, pods/plant and seed yield/ plant indicating the highest contribution of these traits towards the divergence among 25 genotypes of grasspea. Negative values in both vectors for four characters; i.e. days to 50% flowering, pod length, pod width and seeds/ plant had lower contribution towards the divergence.

Knowledge Management: Journal