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Genetic differentiation in Spanish populations of Ceratitis capitata as revealed by abundant soluble protein analysis

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Abstract

Ceratitis capitata is one of the most important pest species in the tropical and temperate regions of the world, however, genetic knowledge of this species is still very limited. In the present study, we have attempted for the first time an analysis of the genetic variability in seven natural populations of C. capitata by means of abundant soluble proteins, combining high resolution techniques such as polyacrylamide gel electrophoresis and silver staining methods. A total of 66 polypeptides have been analyzed. The results show the existence of a decreasing trend in the ‘levels’ of polymorphism from the southern areas to the northern that is correlated with the latitude of the sampling areas, most probably due to the colonization process of the Iberian Peninsula. On the other hand, and with relation to the ‘pattern’ of the variability, a geographic differentiation (not strictly latitudinal) is detected when an UPGMA clustering method was applied to the data. Moreover, principal component anaysis has revealed that a part of this differentiation could be explained in relation with environmental factors such as annual rainfall and minimum temperature in winter months. This is suggesting that selection (added to the historical process) could be playing an important role in the process of geographic differentiation, ‘shaping’ the pattern of that variability. No host-related differentiation has been observed in these samples.

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Authors and Affiliations

  1. Departamento de Gené tica, Facultad de Ciencias Biológicas, Universidad Complutense, 28040, Madrid, Spain

    Aurelio Reyes & Maria Dolores Ochando

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  1. Aurelio Reyes
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  2. Maria Dolores Ochando
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Reyes, A., Ochando, M.D. Genetic differentiation in Spanish populations of Ceratitis capitata as revealed by abundant soluble protein analysis. Genetica 104, 59–66 (1998). https://doi.org/10.1023/A:1003483913805

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