CYTOGENETIC AND DNA CONTENT IN 6 GENERA OF THE FAMILY CALLICHTHYIDAE (PISCES, SILURIFORMES)

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Data

1993-04-01

Autores

Oliveira, C.
Almeidatoledo, L. F.
Mori, L.
Toledo, S. A.

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ISSN da Revista

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Editor

Univ Florence Botany Inst

Resumo

Cytogenetic studies involving conventional Giemsa staining, C-banding analysis and silver staining of NORs were performed on nine species belonging to six genera of the family Callichthyidae. The diploid number ranged from 2n = 44 to 2n = 100, the number of chromosomal pairs with NORs ranged from 1 to 4 and constitutive heterochromatin was mainly distributed in the centromeric and/or pericentromeric position of the chromosomes. The DNA content of erythrocytes from six species studied ranged from 1.18 +/- 0.07 to 2.77 +/- 0.22 pg/nucleus. The extensive variability in karyotypes and in nuclear DNA content detected are in accordance with the initial hypothesis that chromosome rearrangements and polyploidy have played a significant role in the evolutionary history of Callichthyidae.

Descrição

Palavras-chave

CALLICHTHYIDAE, KARYOTYPE, NOR, C-BAND, DNA CONTENT

Como citar

Caryologia. Florence: Univ Florence Botany Inst, v. 46, n. 2-3, p. 171-188, 1993.

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