Cytological evidence for population-specific sex chromosome heteromorphism in Palaearctic green toads (Amphibia,Anura) |
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Authors: | G. Odierna G. Aprea T. Capriglione S. Castellano E. Balletto |
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Affiliation: | (1) Dipartimento di Biologia Strutturale e Funzionale, Università di Napoli Federico II, Via Cinthia 6, 80126 Naples, Italy;(2) Dipartimento di Scienze Biologiche, Università di Napoli Federico II, Via Mezzocannone 8, 80134 Naples, Italy;(3) Dipartimento di Biologia Animale e dell’Uomo, Università di Torino, Via Accademia Albertina 13, 10123 Turin, Italy |
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Abstract: | A chromosome study was carried out on a number of European and Central Asiatic diploid green toad populations by means of standard and various other chromosome banding and staining methods (Ag-NOR-, Q-, CMA3-, late replicating [LR] banding pattern, C- and sequential C-banding + CMA3 + DAPI). This study revealed the remarkable karyological uniformity of specimens from all populations, with the only exception being specimens from a Moldavian population, where one chromosome pair was heteromorphic. Though similar in shape, size and with an identical heterochromatin distribution, the difference in the heteromorphic pair was due to a large inverted segment on its long arms. This heteromorphism was restricted to females, suggesting a female heterogametic sex chromosome system of ZZ/ZW type at a very early step of differentiation. |
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Keywords: | Sex chromosome differentiation inversion heteromorphism green toads Bufo viridis complex Anura |
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