Genetic diversity analysis in tossa jute (Corchorus olitorius L.) germplasm lines

Abstract

An experiment was conducted to examine the magnitude of genetic diversity and characters contributing to genetic diversity among 81 tossa jute genotypes. Cluster analysis based on Euclidean squared distances and ward's method, the genotypes were grouped into ten distinct clusters. Analysis reveals that stick weight contributes maximum to the phenotypic diversity (65.52%) followed by green weight (13.64%) and fibre yield (10.10%). Among the clusters Cluster IX recorded highest mean fibre yield (19.91g) followed by Cluster VII (18.94g) and these clusters also recorded high mean values for plant height, basal diameter, green weight and stick weight. The highest intercluster distance was 186.80 (between clusters II and X) followed by 161.26 (between clusters IV and X), indicating the wide genetic diversity among these clusters. The highest intra-cluster distance was observed in cluster II (20.34) and the lowest in cluster X (3.17). The average inter-cluster distances were higher than the average intra-cluster distances, which shows the presence of wide genetic diversity among the genotypes of different clusters than those of the same cluster. The first two principal components, whose Eigen values are greater than one, accounted for 74% of the total variation among the five characters. The information obtained from diversity analysis is useful in planning further breeding programme for tossa jute improvement.

Elucidation of Genotypic Variability, Character Association, and Genetic Diversity for Stem Anatomy of Twelve Tossa Jute (Corchorus olitorius L.) Genotypes

“…In the present study, the highest intracluster distances were recorded in cluster III (10.138), indicating high variation among the genotypes in the cluster and lowest in cluster I (3.530) indicating less variation among the genotypes in this cluster. The average intercluster distances were higher than the average intracluster distances, which indicates the presence of wide genetic diversity among the genotypes of different clusters than those of the same cluster [57].…”

Genetic Diversity in Fiber Related Traits of Tossa Jute (Corchorus Olitorius L.) Germplam

“…However, the mean value of different clusters varied in magnitude that also implies more diversity among the genotypes for all the fifteen characters. Similar findings were also observed by Arpita and Kumar (2016), Alam (2011), Roy et al (2011), Ghosh et al (2014) and Jatothu et al (2018) while studying the genetic diversity in Corchorus spp.…”

“…So, more emphasis should be given on clusters I and IV to obtain stronger heterosis and broad spectrum of variability in segregatants with new recombination of desired traits. Arpita and Kumar (2016), Akter et al (2010); Roy et al (2011) and Jatothu et al (2018) also reported similar findings while studying genetic diversity in tossa jute germplasm.…”

“…The principal component analysis (PCA) indicated that only the first two principal components showed eigen values above one and jointly responsible for 81.7% of the total variation among the genotypes evaluated for fifteen characters or components (Table 2). Jatothu et al (2018) reported that the first two principal components having the eigen values greater than one accounted for 74 % of total diversity. Denton and Nwangburuka (2012) and Ghosh et al (2014) also studied the jute genetic diversity and found the similar results.…”

“…Tossa jute is comparatively high yielder, producing softer, silkier, stronger and finner fiber as well as expressing more sustainability in the prevailing climatic conditions of the South Asian zone than the white one (Arpita and Kumar, 2016). Due to the high fiber-quality coupled with eco-friendly and biodegradable nature, the demand of the tossa jute fiber is increasing day by day in the western countries (Jatothu et al, 2018) indicating that there is an urgent need to increase the yield levels of jute. The yield levels of the cultivated varieties have plateaued as most of the released varieties were developed from few selected parents.…”