C-heterochromatin and extra (B) chromosome distribution in six species of the Nabis (Heteroptera, Nabidae) with the modal male karyotype 2n = 16 + XY

• Authors: S. Grozeva , S. Nokkala
• Languages of publication: EN

Abstracts

EN

The basic male karyotype of the six Nabis species (Heteroptera, Nabidae) is confirmed as being 2n=16+XY. The chromosomes are holokinetic while male meiosis is achiasmatic. The sex chromosomes undergo postreduction and in second metaphase show distance pairing, registered in all nabid species examined so far. Using C-banding technique for the first time in the family Nabidae, the heterochromatin was revealed on chromosomes of six species. The species showed different amount and distribution of C-heterochromatin. Only in Nabis (Dolichonabis) limbatus did the C-bands distribution make possible the identification of every chromosome pair in the karyotype. In other species, C-bands were found in some of the autosomes and the X, localized either interstitially or at telomeres. Only theYusually showed relative stability of the C-banding pattern. In four of six species, extra (B) chromosomes were observed and their behaviour in meiosis described.

Keywords

EN

B-CHROMOSOME; C-HETEROCHROMATIN; CHROMOSOME; HETEROPTERA; NABIS

Discipline

• EXPERIMENTAL_BIOLOGY_&_MEDICINE: EXPERIMENTAL BIOLOGY & MEDICINE

• Publisher: Institute of Systematics and Evolution of Animals, Polish Academy of Sciences
• Journal: Folia Biologica
• Year: 2002
• Volume: 51
• Issue: 1-2
• Pages: 13-21

Contributors

author

S. Grozeva

author

S. Nokkala

• Document Type: ARTICLE
• Publication order reference: S. Grozeva, Institute of Zoology, Bulgarian Academy of Sciences, 1 Tsar Osvoboditel, 1000 Sofia, Bulgaria