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International Journal of Agricultural Research
Year: 2011  |  Volume: 6  |  Issue: 7  |  Page No.: 517 - 536

Genetic Variability and Association of Bulb Yield and Related Traits in Shallot (Allium cepa Var. Aggregatum DON.) In Ethiopia

Awale Degewione, Sentayehu Alamerew and Getachew Tabor    

Abstract: The aim of this study was to estimate the extent of genetic variability and character association among bulb yield and related traits. Forty nine shallot accessions from major shallot growing regions of were tested at Debre-Zeit Agricultural Research Center, Central Ethiopia from 2009 to 2010 in simple lattice design with two replications. Variances component method was used to estimate phenotypic and genotypic variation, heritability and genetic advance. Association of traits was also estimated using standard method. The accessions differed significantly for most of the characters and relatively wide range of the mean for most of characters indicated the existence of variation among the tested accessions. High Phenotypic Coefficient of Variation (PCV) and Genotypic Coefficient Variation (GCV) were recorded for leaf diameter and percentage of bulb sprouting. High GCV along with high heritability and genetic advance was obtained from leaf diameter and percentage of bulb sprouting. Bulb yield was positively and significantly associated with plant height, leaf length, leaf sheath length, leaf sheath diameter, bulb length, bulb diameter, bulb dry weight, biological yield per plant and marketable yield per plant at both phenotypic and genotypic levels. Genotypic path-coefficient analysis revealed that bulb dry weight exerted maximum positive direct effect on bulb yield and also exhibited positive association with bulb yield per plant, suggesting their possible utilization to improve bulb yield per plant. D2 analysis showed the 49 shallot accessions grouped into six clusters. This makes the accessions to become moderately divergent. Principal component analysis showed that the first six principal components explained about 76.15% of the total variation. Over all, the study confirmed the presence of character diversity in Ethiopian shallot accessions and this could be exploited in the genetic improvement of the crop through hybridization and simple selection.

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