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Sabrao Journal of Breeding and Genetics, Volume 48, Issue 1, 2016, pp. 61-71

Assessment of genetic divergence in kenaf (Hibiscus cannabinus L.) genotypes using agro-botanical characteristics and multivariate analysis

Abstract :

Agro-botanical characteristics of 33 kenaf genotypes were investigated for genetic divergence using agro-botanical and multivariate analyses. The genotypes were evaluated and data analyzed across two seasons in 2014. Multivariate analysis was used to identify the genetic variation among the genotypes and the extent of contribution of each factor to the variation. Wide variation observed in the genotypes’ agro-botanical characteristics proved their genetic diversification. Stems and leaves of the plants were predominantly green. Leaves of most genotypes were palmate, deeply lobed and had serrate margin. First 6 principal component axes showed strong discriminating ability among the characters, and accounted for 81.5% of the total variance. Principal component axes (PCAs) I and II had eigen values greater than unity and the difference between the 2 axes were (1.526). The discriminating ability of PCA I was strongest but did not adequately distinguish the genotypes. It accounted for 26.7% due to basal, middle and top stem diameter. Principal component II which accounted for 16.5% described variation in the flowering pattern whereas PC III described variation due to yield components accounting for 13.0%. The basal, middle and top stem diameters, days to first, and 50%, flowering, bast and core dry weights respectively contributed large variability as 0.8832, 0.8866, 0.8963, 0.8413, 0.6761, 0.8063 and 0.8138 as eigen vectors. The genotypes were early maturing and plant height in four clusters ranged from 201.50 cm to 264.83 cm. Genotypes that clustered into groups I and II are good candidates for fibre production. PCAs I and II adequately distinguished 32 of the 33 genotypes suggesting a high level variability among the genotypes. Genotypes AU-245243, A-60-282-51, AC-313244, Tianung 2 and Ex-Shika loaded the first 3 principal axes. Genotypes 2QQ 13 and AU-60-2826 were most distinct in all the 3 configurations. © Society for the Advancement of Breeding Research in Asia and Oceania.

Keywords : Accessions discrimination,Agro-botany,Diversity,Fibre,Genoype,Kenaf,Principal component analysis
Subject Area : Biotechnology Genetics Agronomy and Crop Science Animal Science and Zoology Horticulture

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