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...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2007 |
| País: | Brasil |
| Institución: | Universidade Estadual Paulista (UNESP) |
| Repositorio: | Repositório Institucional da UNESP |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.unesp.br:11449/69667 |
| Acceso en línea: | http://www.geneticsmr.com//year2007/vol6-1/pdf/gmr0249.pdf http://hdl.handle.net/11449/69667 |
| Access Level: | acceso abierto |
| Palabra clave: | Heteroptera Heteropycnosis Karyotype Lygaeidae Nucleolar corpuscles Nysius californicus animal tissue autosome chromosome analysis chromosome chiasm chromosome NOR controlled study male metaphase chromosome microchromosome mitosis rate nonhuman nucleolus pest organism prophase seminiferous tubule sex chromosome sex determination spermatogenesis spermatozoon sunflower testis animal cytology genetics meiosis physiology Orsillinae Xyonysius californicus Animals Male Meiosis Nucleolus Organizer Region Seminiferous Tubules Sex Chromosomes Spermatogenesis |
| Sumario: | 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. ©FUNPEC-RP. |
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