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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/9300

Title: Karyotype Differentiation in Newly Discovered Members of the Drosophila obscura Species Group from Yunnan, China
Authors: Gao, Jian-jun
Watabe, Hide-aki
Zhang, Ya-ping
Aotsuka, Tadashi
Keywords: Drosophila obscura species group; Karyotype differentiation; China
Issue Date: 31-Dec-2004
Publisher: Kunming Institute of Zoology, Chinese Academy of Sciences
Citation: Zoological Research (ISSN: 0254-5853) Vol 25 Num 3
Abstract: We examined mitotic chromosomes of three newly found members of the Drosophila obscura species group,D.luguensis,D.dianensis and D.limingi from Yunnan and compared their karyotypes to those of respective related species.D.luguensis possessed a diploid number of 12 chromosomes,comprising 3 pairs of metacentrics (V-shaped),2 pairs of acrocentrics (rod-like) and 1 pair of micro-chromosomes (dot-like).Both the X and Y were metacentrics.D.dianensis and D.limingi possessed a diploid number of 10 chromosomes,comprising 1 pair of large V-shaped,1 pair of moderate-sized V-shaped,2 pairs of submetacentric (J-shaped) chromosomes,and 1 pairs of dot-like chromosomes,with their X chromosomes were J-shaped and Y chromosomes were short rod-like ones.Based upon the results of chromosomal comparisons,geographic information of the sinobscura subgroup,as well inter-specific phylogenetic relationship deduced elsewhere,D.luguensis was considered to retain an ancestral form of the karyotype within this subgroup.The present observations have also implied that D.sinobscura (2n=12:2V,1J,2R,1D) might have derived from a sub-lineage of a pre-"sinobscura-hubeiensis" lineage by pericentric inversion of moderate-sized metacentric autosomes and D.hubeiensis (2n=10:4V,1D) from another sub-lineage of the same lineage by centric fusion of 2 pairs of acrocentric autosomes.Similar chromosomal changes of centric fusion,centric fission and/or pericentric inversion might have occurred during the course of species divergences between D.dianensis and D.subsilvestris (2n=12:3V,2R,1D),an European member closely related to D.dianensis,and between D.limingi and D.tsukubaensis (2n=12:3V,2R,1D),an East Asian member near to D.limingi.
URI: http://hdl.handle.net/1807/9300
Other Identifiers: http://www.bioline.org.br/abstract?id=zr04042
Rights: Copyright 2004 Kunming Institute of Zoology, the Chinese Academy of Sciences
Appears in Collections:Bioline International Legacy Collection

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