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Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: A ’G’ chromosome banding study of three cupped oyster species: Crassostrea gigas, Crassostrea angulata and Crassostrea virginica | Genet. Sei. Evol. 31 1999 519-527 Inra Elsevier Paris 519 Original article A G chromosome banding study of three cupped oyster species Crassostrea gigaS Crassostrea angulata and Crassostrea virginica Mollusca Bivalvia Alexandra Leitãoa c Catherine Thiriot-Quiévreuxa Pierre Boudryb Isabel Malheiroc a Observatoire océanologique Université p. et M. Curie CNRS-INSU BP 28 06230 Villefranche-sur-Mer France b Laboratoire de génétique et pathologic Station Ifremer BP 1337 17390 La Tremblade France Institute de ciências biomédicas de Abel Salazar Universidade do Porto Lg. Prof. Abel Salazar 2 4000 Porto Portugal Received 26 May 1999 accepted 12 August 1999 Abstract - The G-banding technique was performed on chromosomes from gill tissue of three cupped oyster species Crassostrea gigas Crassostrea angulata and Crassostrea virginica. Identification of the ten individual chromosome pairs was obtained. Comparative analysis of G-banded karyotypes of the three species showed that their banding patterns generally resembled each other with chromosome pair 3 being similar in all three species. However differences from one species to another were also observed The G-banding pattern highlighted greater similarities between c. gigas and c. angulata than between these two species and c. virginica thus providing an additional argument for genetic divergence between these two evolutionary lineages. c. gigas and c. angulata showed a different G-banding patterns on the two arms of chromosome pair 7 which agrees with their taxonomic separation. The application of this banding technique offers a new approach to specific problems in oyster taxonomy and genetics. Inra Elsevier Paris chromosome G-banding Crassostrea gigas I Crassostrea angulata Crassostrea virginica Correspondence and reprints E-mail t hiriot @ccrv.obs-vlfr.fr 520 A. Leitão et al. Resume Etude du marquage chromosomique en bandes G chez trois espèces d huitres creuses Crassostrea gigas Crassostrea angulata et Crassostrea .
