Genome size and base composition in Oryzaephilus surinamensis (Coleoptera: Sylvanidae) and differences between native (feral) and silo pest populations in Israel |
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Authors: | Kamal Sharaf,Tomá &scaron Pavlí ?ek,Eviatar Nevo |
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Affiliation: | a Graduate Studies Authority, The Committee for Doctoral Studies, University of Haifa, Haifa 31905, Israel b Department of Botany and Zoology, Faculty of Sciences, Masaryk University, Kotlá?ská 2, 611 37 Brno, Czech Republic c Institute of Evolution, University of Haifa, Haifa 31905, Israel |
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Abstract: | In this study, flow cytometry was used for assessing and comparing the genome size (GS) and the whole genome base composition (AT/GC ratio) of the saw-toothed grain beetle Oryzaephilus surinamensis (L.). In addition, the presence and frequency of endosymbiotic Wolbachia bacteria was studied. The haploid GS was estimated to lie within the range of 151.5-154 Mbp in O. surinamensis, making it the smallest value of haploid GS known among beetles. Furthermore, it was found that in eight silo pest populations GS was significantly smaller than in eight feral (native) populations obtained from fallen oak acorns. The ability of O. surinamensis to colonize different habitats globally could be connected with an unusually AT-rich (for an invertebrate) genome (AT-base content ranging from 68 to 76%). Native (feral) populations of O. surinamensis appear to have genetically diverged from the storage-pest populations tested. Larvae of pest origin survived better than larvae of native (feral) origin under laboratory conditions, which resembled silo conditions more than natural habitats. |
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Keywords: | Genome size AT/CG Oryzaephilus surinamensis Wolbachia |
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