ABSTRACT

The genetic diversity was studied for eleven growth and yield related characters in fifty three genotypes of tossa jute which were collected from the Gene Bank of Bangladesh Jute Research Institute (BJRI), Dhaka. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. The highest intra-cluster distance was estimated for cluster IV (0.338) which consisted of fourteen genotypes followed by cluster III (0.330) for eighteen genotypes, cluster V (0.297for seven genotypes and cluster II (0.284) for eleven genotypes. Cluster III contained the largest number of genotypes (eighteen) followed by cluster IV (fourteen) and cluster II (eleven), respectively. The inter cluster distance was maximum between cluster I and V (20.616) followed by the distance between clusters I and IV (18.405), I and III (14.857), II and V (10.984), I and II (10.277) indicating that the genotypes grouped within these cluster were highly divergent from each other. The least genetic distance at inter-cluster level was observed between cluster IV and V (2.871), followed by the distance between clusters III and IV (4.296), and between II and III (4.584) indicating that the genotypes of these clusters were genetically closely related. The maximum contribution was paid by the character, base diameter (0.5335) followed by green wt. without leaves (0.4790), green bark thickness (0.4672) and plant height (0.3858).

Key words: Genetic diversity, clustering, tossa jute.

Introduction

 Information on genetic divergence among the parental materials is vital to plant breeder for an efficient choice of parents for hybridization. More diverse parents are the chances for high heterotic F1S and broad spectrum of variability in segregating generation (Murty and Arunachalam, 1966). However, evaluation of genetic diversity is important to know the source of gene for a particular trait within the available germplasm (Tomooka, 1991). In the past, very few researches have been carried out related to morpho–agronomic diversity and relationships in jute with diverse geographical origins. Plave and Sinha (2005) used 6 accessions of C. capsularis L. and 7 accessions of C. olitorius L. for their study. Recently, Benor et al. (2012) used only C. olitorius L. species to study genetic diversity and relationships inferred from molecular and morphological data. Moreover, multivariate methods particularly principal component analysis (PCA) have proven to be useful for characterizing, evaluating and classifying germplasm when a large number of accessions are assessed for several characteristics of agronomic importance (Badenes et al., 2000). Rapid genetic improvement of crop depends on the availability of sufficient genetic diversity, which could be selected and combined in various forms to produce reasonable improvement (Wani, 2011). Hence in the present study the genetic diversity was studied for eleven growth and yield related characters in fifty three genotypes for further development and creation of higher diversity in tossa jute.