Study of chromosomal and nucleolar aspects in testes of Nysius californicus (Heteroptera: Lygaeidae)

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 chromos...

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Bibliographic Details
Published in:Genetics and molecular research 2007-01, Vol.6 (1), p.33-40
Main Authors: Souza, H.V, Bicudo, H.E.M.C, Itoyama, M.M
Format: Article
Language:English
Subjects:
Animals
cell nucleolus
chromosome complement
genetic variation
Hemiptera
Heteroptera - cytology
Heteroptera - genetics
insect genetics
insect pests
Lygaeidae
Male
males
Meiosis
microchromosome
Nucleolus Organizer Region
Nysius
Nysius californicus
plant pests
seminiferous tubules
Seminiferous Tubules - cytology
sex chromosomes
Sex Chromosomes - physiology
Spermatogenesis - physiology
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Summary: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.
ISSN:1676-5680
1676-5680