Heterochromatin heteromorphism in Holhymenia rubiginosa (Heteroptera: Coreidae)

Title:

Heterochromatin heteromorphism in Holhymenia rubiginosa (Heteroptera: Coreidae)

Creator:

Bressa, María José, Franco, María José, Tosacani, María Ayelén, and Papeschi , Alba Graciela

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:a6f74a53-f906-4e7c-9376-fd90d920c1c3
uuid:a6f74a53-f906-4e7c-9376-fd90d920c1c3

Subject:

Coreidae, holokinetic chromosomes, C-banding, fluorescent-banding, karyotype evolution, fluorescent in situ hybridization, and rDNA

Type:

article, model:article, and TEXT

Description:

Heterochromatin is one of the most dynamic components in the genome of species. Previous studies on the heterochromatin content and distribution in Heteroptera (insects with holokinetic chromosomes) have shown that the species belonging to the family Coreidae are interesting model organisms since they show very diverse C bands patterns. In the present work, we analyzed the C-band pattern in individuals of Holhymenia rubiginosa from different populations collected in different years. This species has the diploid karyotype 2n = 27/28 = 24 + 2m + X0/XX (male/female). C-bands are terminally, subterminally or interstitially located on 10-17 chromosomes and a remarkable heterochromatin heteromorphism is observed in the meiotic bivalents: in the presence/absence of bands, in the size of bands and number of bands. A heteromorphism is also inferred in the number of ribosomal genes from the difference in the fluorescent in situ hybridization signals between NOR-homologues. Chiasmata are generally located opposite to conspicuous C-bands, but in some bivalents chiasmata are also observed in close proximity to C-bands. Considering the striking variation in heterochromatin content between individuals and populations it is suggested that heterochromatin should be selectively neutral in H. rubiginosa.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Source:

European Journal of Entomology | 2008 Volume:105 | Number:1

Harvested from:

CDK

Metadata only:

false