Study of chromosomal and nucleolar aspects in testes of Nysius californicus (Heteroptera: Lygaeidae)
Genet. mol. res. (Online)
;
6(1): 33-40, 2007. ilus
Artículo
en Inglés
| LILACS
| ID: lil-440619
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.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Túbulos Seminíferos
/
Cromosomas Sexuales
/
Espermatogénesis
/
Heterópteros
/
Región Organizadora del Nucléolo
Límite:
Animales
Idioma:
Inglés
Revista:
Genet. mol. res. (Online)
Asunto de la revista:
Biologia Molecular
/
Genética
Año:
2007
Tipo del documento:
Artículo
País de afiliación:
Brasil
Institución/País de afiliación:
Universidade Estadual Paulista/BR
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