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First evidence of polyploidy in Psylloidea (Homoptera, Sternorrhyncha): a parthenogenetic population of Cacopsylla myrtilli (W. Wagner, 1947) from northeast Finland is apomictic and triploid

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Abstract

This paper reports results of the first cytogenetic study of parthenogenetic psyllids, carried out on an asexual population of the holarctic species Cacopsylla myrtilli W. Wagner from northeast Finland. Preparations of mature eggs extracted from females revealed 39 univalent chromosomes in prophase and metaphase cells. Hence, female meiosis is of apomictic type and replaced by a modified mitosis. The karyotype consists of 3n = 39 (36 + XXX). Clearly, the population is triploid, the haploid number being n = 12 + X as characteristic of the genus Cacopsylla as a whole. As typical for Psylloidea, the chromosomes are holokinetic, only slightly varying in size and without any visible markers, rendering impossible the precise identification of triplets of homologous chromosomes in the triploid complement. The distribution of bisexual and parthenogenetic populations of C. myrtilli throughout the world is briefly given, and a possible origin of the triploid parthenogenetic population is discussed.

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Acknowledgements

We would like to thank Dr. I. Kerzhner and Dr. E. Labina for information on collection places of C. myrtilli in Russia based on the collection of Zoological Institute, St. Petersburg. We are grateful to Dr. Robert Angus for revising the linguistic usage. The study was supported by the Academy of Finland, Russian Academy of Sciences, Polish Academy of Sciences, as well as (for V.G. Kuznetsova) by the Russian Foundation for Basic Research (Grant 05-04-48387) and the Program of the Presidium RAS “Dynamics of Gene Pools in Animals, Plants and Man”.

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Authors and Affiliations

  1. Laboratory of Genetics, Department of Biology, University of Turku, Turku, 20014, Finland

    Seppo Nokkala

  2. Department of Experimental Zoology, Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Kraków, 31-016, Poland

    Anna Maryańska-Nadachowska

  3. Zoological Institute, Russian Academy of Sciences, St. Petersburg, 199034, Russia

    Valentina G. Kuznetsova

Authors
  1. Seppo Nokkala
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  2. Anna Maryańska-Nadachowska
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  3. Valentina G. Kuznetsova
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Correspondence to Seppo Nokkala.

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Nokkala, S., Maryańska-Nadachowska, A. & Kuznetsova, V.G. First evidence of polyploidy in Psylloidea (Homoptera, Sternorrhyncha): a parthenogenetic population of Cacopsylla myrtilli (W. Wagner, 1947) from northeast Finland is apomictic and triploid. Genetica 133, 201–205 (2008). https://doi.org/10.1007/s10709-007-9200-3

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  • DOI: https://doi.org/10.1007/s10709-007-9200-3

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