Chromosome study in Schistocerca (Orthoptera-Acrididae-Cyrtacanthacridinae): karyotypes and distribution patterns of constitutive heterochromatin and nucleolus organizer regions (NORs)
Genet. mol. biol
; 30(1): 54-59, 2007. ilus
Article
in English
| LILACS
| ID: lil-445683
Responsible library:
BR1.1
ABSTRACT
Chromosome analyses were performed in two grasshopper species of the genus Schistocerca, S. pallens and S. flavofasciata. Both species shared the same diploid number (2n = 23, X in males; 2n = 24, XX in females);and a conserved karyotype composed exclusively of acrocentric chromosomes, but differed in their distribution patterns of constitutive heterochromatin and nucleolus organizer regions (NORs). Constitutive heterochromatin was located in the pericentromeric region of all chromosomes in both species. S. flavofasciata presented an additional C-band on the distal region of the long arm of a small autosome pair (S9). Nucleolus organizer regions (NORs), revealed by silver nitrate staining (Ag-NORs), were observed on a medium autosome pair (M5) in both species. S. pallens presented an additional NOR-bearing autosome (M6). The same sites were labeled after FISH with an rDNA probe in S. pallens cells.
Full text:
Available
Collection:
International databases
Database:
LILACS
Language:
English
Journal:
Genet. mol. biol
Journal subject:
Genetics
Year:
2007
Document type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Embrapa Semi-árido/BR
/
Universidade Federal de Pernambuco/BR