Karyotype Diversity in Two Populations of Rhamdia quelen (Pisces, Heptapteridae)

• Stivari Marcia Keller

  Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá

• Martins-Santos Isabel Cristina

  Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá

抄録

Cytogenetic studies in 2 populations of Rhamdia quelen collected from the Taquarussu river and Maringá stream were carried out. Both populations showed diploid number 2n=58 chromosomes but differed in relation to the caryotype formulae (26M+20SM+6ST+6A, 26M+22SM+6ST+4A respectualy). Beside the Taquarussu population showed 1 to 4 metacentric B chromosomes. Different-sized of B chromosomes were reported: middle-sized were more frequent; large-sized ones were found in only one specimen. Maringá population showed karyotypic variation in 22% of the individual (26M+24SM+8ST), indicating the occurrence of structural rearrangements. Ag-NOR analysis revealed simple NOR system for both, although there were differences in the region's bearer pair type. C-banding results showed weak telomere or centromere markings in certain chromosomes and more evident bands in the NOR region and at the extremities of the 2 B chromosome types. Chromomycin A₃ coloration revealed NOR to be CMA₃ positive in the 2 populations and consequently rich in GC. B chromosomes are CMA₃ negative.

収録刊行物

• ＣＹＴＯＬＯＧＩＡ

  ＣＹＴＯＬＯＧＩＡ 69 (1), 25-34, 2004

  公益財団法人 日本メンデル協会

キーワード

• cytogenetics
• B chromosomes
• NOR banding
• C-band
• <i>Rhamdia quelen</i>
• Heptapteridae

詳細情報

• CRID: 1390282679083197568
• NII論文ID: 10012505124
• NII書誌ID: AA00622764
• DOI: 10.1508/cytologia.69.25
• ISSN: 13487019
• ISSN: 00114545
• Web Site: http://www.jstage.jst.go.jp/article/cytologia/69/1/69_1_25/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可