Abstract
Parthenogenesis and, in particular, polyploidy are rare in animals. A number of cases, known among weevils, represent apomictic parthenogenesis—a reproductive mode in which eggs undergo one maturation division, the chromosomes divide equationally, and no reduction takes place. Among parthenogenetic weevils there are two diploids, 48 triploids, 18 tetraploids, six pentaploids, three hexaploids and one decaploid. Eight examined parthenogenetic species are triploids with 33 chromosomes of different morphology, confirming that triploidy is the most common level of ploidy in weevils. The karyotypes are heterogeneous with the presence of meta-, submeta-, subtelo- and acrocentric chromosomes. The C-banding method showed that only two species possess a large amount of heterochromatin visible as a band around the centromere during mitotic metaphase. This agrees with observations that weevils are characterized by a small amount of heterochromatin, undetectable in metaphase plates after C-banding. In three species an atypical course of apomictic oogenesis occurs with stages similar to meiosis, in which chromosomes form bivalents and multivalent clusters. This association of chromosomes probably represents the remnants of meiosis, although these events have nothing to do with recombination. The results support the hypothesis that the evolution of apomictic parthenogenesis in weevils has proceeded through a stage of automixis.
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Acknowledgements
This research was supported by the Polish Ministry of Science and Information Society Technologies, grant number 3PO4C 085 to Dorota Lachowska and by VEGA (Scientific Grant Agency of the Ministry of Education and the Slovak Academy of Sciences), grant number 1/3277/06 for Milada Holecová.
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Lachowska, D., Rożek, M. & Holecová, M. New data on the cytology of parthenogenetic weevils (Coleoptera, Curculionidae). Genetica 134, 235–242 (2008). https://doi.org/10.1007/s10709-007-9230-x
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DOI: https://doi.org/10.1007/s10709-007-9230-x