International Journal of Plant Sciences

K. V. Vijaya Kumar ¹, K. T. Venkatesha ¹, M. Asif ¹, E. Gangappa ¹, M. Pitchai Muthu ²

Affiliations
1 Department of Genetics and Plant Breeding, University of Agricultural Sciences, G.K.V.K., Bengaluru, Karnataka, IN
2 Division of Vegetable Crops, Indian Institute of Horticultural Research, Hesaraghatta, Bengaluru, Karnataka, IN

Abstract

Using Mahalonobis D² statistic and Tocher method, 166 germplasm lines were grouped into 18 divergent clusters. Clustering pattern was not associated with geographical region of genotypes. Hence, Geographical separation may not be referred as index of genetic diversity. Yield per plant, Mean inter-node s length and nodes per plant contributed largely for total divergence, revealing ample scope for improvement of these traits. Maximum number of genotypes were congregated in cluster XVIII followed by cluster I. the highest inter cluster distance between cluster I and cluster XVIII emphasized the possibilities of getting high heterotic F1 hybrids as well as transgressive segregants in advanced generations for different traits , when hybridization is carried out involving genotypes between these two divergent clusters.

Keywords

Intra And Inter Clusters Distances, Intra And Inter Clusters Divergence And per Cent Contribution

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K. V. Vijaya Kumar ¹, K. T. Venkatesha ², M. Asif ¹, E. Gangappa ¹, M. Pitchaimuthu ³

Affiliations
1 Genetics and Plant Breeding, University of Agricultural Sciences, G.K.V.K., Bengaluru, Karnataka, IN
2 Department of Genetics and Plant Breeding, University of Agricultural Sciences, G.K.V.K., Bengaluru, Karnataka, IN
3 Division of Vegetable Crops, Indian Institute of Horticultural Research, Bengaluru, Karnataka, IN

Abstract

The analysis of variance revealed significant differences among the okra collections for all the traits. The estimates on variability parameters indicated considerable range of variation in the germplasm for all the characters studied. Environmental influence was meagre on expression of characters as evident by narrow gap between genotypic and phenotypic co-efficient of variation. The genotypic and phenotypic co-efficients of variations were high for all the characters except days to 50 per cent of flowering and ridges per fruit. A high range of variation, genotypic co-efficient of variation, heritability and genetic advance on per cent mean for plant height, branches per plant, nodes per plants and fruit yield per plant was recorded. This indicated broad genetic base, less environmental influence and these traits are under control of additive genes, simple and early selection schemes would be effective for improvement of these traits. Despite high heritability, the mean of genetic advance was low for days to 50 per cent flowering indicating low variability for this trait.

Keywords

Genetic Variability, Okra, Germplasm

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