Vol. 7, Issue 4 (2019)
Genetic diversity studies in exotic germplasm lines for yield related traits in soybean (Glycine max (L.) Merrill)
Author(s): Suresha PG and Basavaraja GT
Abstract: Knowledge of the naturally occurring diversity helps to identify diverse groups of soybean genotypes that can be useful for the breeding program. Therefore, this study aims to identify traits that influence the soybean genotypes in cluster formation using k-means cluster analysis. 144 exotic germplasm lines including checks viz., DSb 21, JS 335, EC 241780 and EC 241778 were evaluated in augmented block design and grouped into eight clusters. Maximum number of genotypes were grouped in the cluster V (39 genotypes) followed by cluster I (35 genotypes), cluster VII and cluster VIII (20 genotypes each). The formation of distinct solitary clusters may be due to the fact that exotic germplasm lines belong to different regions which may be responsible for this type of genetic diversity. It could be seen that clusters vary much with respect to mean expression of various characters which resulted in distinct clusters. There were significant differences between the mean of clusters for all the traits. The inter-cluster distance was maximum between clusters II and VI (D=55.64) followed by clusters VII and VIII (D=53.07). The minimum inter-cluster distance was observed between clusters I and III (D=7.07). The genotypes belonging to the clusters separated by high statistical distance could be used in hybridization programme for obtaining a wide spectrum of variation among the segregants. The traits viz., number of pods per plant (41.82), seed yield per plant (18.24), number of branches per plant (17.47) and days to 50 % flowering (13.42) exhibited major contribution towards the diversity while, days to maturity (9.05) contributed the least towards total genetic diversity. The genotypes viz., DSb 21 of cluster VI, EC 242104 of cluster I, EC 241780 and EC 241778 of cluster IV and JS 335 of cluster V were identified as genetically diverse parents, which can be utilized for future crop improvement programme.
Pages: 2066-2071 | 228 Views 57 Downloads
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How to cite this article:
Suresha PG, Basavaraja GT. Genetic diversity studies in exotic germplasm lines for yield related traits in soybean (Glycine max (L.) Merrill). Int J Chem Stud 2019;7(4):2066-2071.
