Assessment of Genetic diversity in upland cotton (Gossypium hirsutum L.) germplasm accessions to improve their yield and fibre quality traits
The improvement of any crop mainly depends upon the nature and magnitude of genetic variability present in the base population. The objective of this study was to assess the genetic diversity and relationship among the G. hirsutum accessions using multivariate Mahalanobis D2 statistics. Fifty four G. hirsutum accessions of diverse origin were utilized in this study. In D2 analysis, the 54 accessions were grouped into into 12 clusters. Grouping of accessions into different clusters was independent of the geographical origin of accessions and it also revealed that single plant yield contributed the maximum divergence of 63.5per cent. The highest cluster mean for number of bolls per plant was recorded by the cluster XI, for boll weight by cluster X, for single plant yield by cluster XII and for Fibre length cluster VI. The crosses between the genotypes of these clusters viz., SVPR 4 (XI), TCH 1732 (X), Okra Narrow (XII), and TCH 1710 (VI) were expected to express high heterotic vigour. The molecular diversity analysis was also carried by using SSR markers. The markers NAU 4900, NAU 2591 were identified as very effective with polymorphism. The outcome of this study will be helpful in selection of parents with wide genetic distances which could be used as parents in hybridization programme and to develop mapping population to identify Quantitative Trait Loci linked to traits of agronomic importance in cotton.
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