Holocentric chromosomes of Psocids (Insecta, Psocoptera) analysed by C-banding, silver impregnation and sequence specific fluorochromes CMA3 and DAPI

• Authors: N.V. Golub , S. Nokkala , V.G. Kuznetsova
• Languages of publication: EN

Abstracts

EN

The pattern of nucleolus attachment and C-heterochromatin distribution and molecular composition in the karyotypes of psocid species Psococerastis gibbosa (2n = 16+X), Blaste conspurcata (2n = 16+X) and Amphipsocus japonicus (2n = 14+neo-XY) were studied by C-banding, silver impregnation and sequence specific fluorochromes CMA3 and DAPI. Every species was found to have a single nucleolus in male meiosis. In P. gibbosa the nucleolus is attached to an autosomal bivalent; in B. conspurcata to the X-chromosome; in A. japonicus to the neo-XY bivalent. The species show a rather small amount of constitutive heterochromatin, C-blocks demonstrating telomeric localization with rare exceptions. P. gibbosa is characterized by a polymorphism for C-blocks occurrence and distribution. In the autosomes of this species, C-heterochromatin consists of AT-rich DNA except for the nucleolus organizing region, which is also GC-rich; the X-chromosome shows both AT- and GC-rich clusters. In A. japonicus and B. conspurcata, C-heterochromatin of the autosomes and sex chromosomes consists of both GC-rich and AT-rich DNA clusters, which are largely co-localized.

Keywords

EN

HETEROCHROMATIN; KARYOTYPE; NUCLEOLUS; PSOCOPTERA

Discipline

• EXPERIMENTAL_BIOLOGY_&_MEDICINE: EXPERIMENTAL BIOLOGY & MEDICINE

• Journal: Folia Biologica
• Year: 2004
• Volume: 52
• Issue: 3-4
• Pages: 143-149

Contributors

author

N.V. Golub

author

S. Nokkala

author

V.G. Kuznetsova

• Document Type: ARTICLE
• Publication order reference: Natalia v. Golub, Department of Karyosystematics, Zoological Institute Russian Academy of Sciences, 199034 St. Petersburg, Russia