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Genetic Variability in Pepper (Capsicum annuum L.) Estimated by Morphological Data and Amplified Fragment Length Polymorphism Markers

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Abstract.

Data on genetic similarity among crop cultivars is of vital importance for the plant breeder. The objectives of this study were to group pepper (Capsicum annuum L.) genotypes into clusters according to their distances as estimated by morphological traits and amplified fragment length polymorphism (AFLP) markers and to assess the relationships between the two. Thirty-nine pepper genotypes obtained from different countries were grown in the greenhouse at University of the Free State, South Africa, during 2001 and 2002 in a randomized complete block design with three replications. A total of 20 different morphological traits were measured and six AFLP primer pairs were used to estimate pairwise genetic distances. Both datasets showed high genetic distances among the different genotypes, indicating high genetic diversity among them. The mean genetic distance among Ethiopian pungent elongated-fruit genotypes, was lower than that between them and the introduced ones. Morphological and AFLP distance estimations generally clustered together genotypes with similar fruit sizes. Significant, positive correlation was observed between morphological and AFLP diversity estimations. The narrow genetic basis among the Ethiopian pungent elongated-fruit cultivars suggests that the pepper breeding program of Ethiopia should focus on enriching its germplasm through local collection and introductions from other parts of the world.

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Authors and Affiliations

  1. Department of Plant Sciences, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa

    L.F. Geleta, M.T. Labuschagne & C.D. Viljoen

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  1. L.F. Geleta
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  2. M.T. Labuschagne
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  3. C.D. Viljoen
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Correspondence to M.T. Labuschagne.

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Geleta, L., Labuschagne, M. & Viljoen, C. Genetic Variability in Pepper (Capsicum annuum L.) Estimated by Morphological Data and Amplified Fragment Length Polymorphism Markers. Biodivers Conserv 14, 2361–2375 (2005). https://doi.org/10.1007/s10531-004-1669-9

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  • DOI: https://doi.org/10.1007/s10531-004-1669-9

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