Study of chromosomal and nucleolar aspects in testes of Nysius californicus (Heteroptera: Lygaeidae)
Genet. mol. res. (Online)
; 6(1): 33-40, 2007. ilus
Article
in English
| LILACS
| ID: lil-440619
Responsible library:
BR1.1
ABSTRACT
In Nysius californicus (family Lygaeidae, subfamily Orsillinae), a pest commonly known as the seed bug, the chromosome complement is 2n = 16 (12A + 2m + XY), testes are formed by seven seminiferous tubules covered by an orange-colored membrane, and spermatogenesis is cystic. At prophase, sex chromosomes are heteropycnotic and autosomes usually show a chiasma. At metaphase, sex chromosomes along with microchromosomes may be seen located at the center of a ring formed by the remaining autosomes. A characteristic specific of N. californicus was the presence of nucleolar material observed from the cystic cell to the completely differentiated spermatozoon.Variations in size, shape and location of the nucleolar material occur during this process, denoting a variable degree of activity in the different stages.
Full text:
Available
Collection:
International databases
Database:
LILACS
Main subject:
Seminiferous Tubules
/
Sex Chromosomes
/
Spermatogenesis
/
Heteroptera
/
Nucleolus Organizer Region
Limits:
Animals
Language:
English
Journal:
Genet. mol. res. (Online)
Journal subject:
Molecular Biology
/
Genetics
Year:
2007
Document type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Estadual Paulista/BR