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Genetic diversity estimates of exotic and indigenous cauliflower (Brassica oleracea var. botrytis) genotypes

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Research Paper 01/10/2019
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Genetic diversity estimates of exotic and indigenous cauliflower (Brassica oleracea var. botrytis) genotypes

Saba Aleem, Iram Sharif, Mehvish Tahir, Nusrat Parveen, Etlas Amin, Rasheda Aslam, Tasdiq Hussain Shahid, Muhammad Najeebullah
Int. J. Biosci.15( 4), 230-240, October 2019.
Certificate: IJB 2019 [Generate Certificate]
Key: BiplotCauliflowerClusterGenetic diversityPrincipal component analysis

Abstract

Exotic cauliflower genotypes are widely cultivated in Pakistan due to their excellent curd quality. Exotic and indigenous genotypes are important source for valuable genes and required to broaden the genetic base of a crop. A comprehensive knowledge regarding genetic variation and genetic diversity is required to select parents for future breeding program. In the present study, one indigenous and eighteen exotic genotypes were evaluated for the presence of genetic diversity through principal component and cluster analyses. Experiment was designed in randomized complete block design with two replications at the experimental area of Vegetable Research Institute, Faisalabad, Pakistan. In principal component analysis, five principal components extracted had eigen value >1 and contributed 82.23% of variation among the genotypes. Traits i.e. maturity days, plant weight, curd weight, curd yield, plant height to extreme, plant width, D9L, plant height to apex, D1L, D9L, leaf attitude contributed significant positive component loading to these PCs. Biplot analysis among these PCs found the genotypes FDIII, Pelican, TCF603, Tabinda, C002F1, Giewont, CF-16049, SV-3630 AC, CF-370 and Whistler as diverse ones. Cluster analysis based on Euclidian distance grouped the genotypes in to 5 distinct clusters. Some of the exotic genotypes were grouped into similar cluster and tend to have narrow genetic base. Based on these results, it may conclude that accessions from distinct cluster may be used for obtaining diverse recombinants in segregating generations, exploiting heterosis and broaden the genetic base of the exciting cauliflower germplasm.

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