Show simple item record

dc.creatorGALLARDO,MILTON H
dc.creatorGARRIDO,ORLANDO
dc.creatorBAHAMONDE,RAÚL
dc.creatorGONZÁLEZ,MARCELO
dc.date2004-01-01
dc.date.accessioned2020-02-17T15:35:41Z
dc.date.available2020-02-17T15:35:41Z
dc.identifierhttps://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000500006
dc.identifier.urihttps://revistaschilenas.uchile.cl/handle/2250/132028
dc.descriptionNucleotypic effects link DNA content with nuclear size and cell dimensions of reproductive cells in polyploid organisms. We studied the gametogenesis of the allotetraploid rodent Tympanoctomys barrerae, aiming to determine these effects in reproductive cells. The species' cofamily members, Octodon degus and Spalacopus cyanus were used as control. Spermatogenesis and oogenesis in T. barrerae follows the pattern of differentiation and sequence of events of the control species, but varied nucleotypic effects were observed. Exceedingly large, spatulated spermatozoa with a submedially attached flagellum are characteristic of male T. barrerae. The diameter of the nuclei of primordial and growing follicles as well as those of the Graaff follicles, of the granulose, and of luteal cells are significantly larger and heavily heterochromatic. Moreover, the width of the pellucid zone is 108% thicker in T. barrerae than in S. cyanus. Binucleation was recorded in 26% of luteal bodies examined whereas no binucleated cells are detected in the diploid control. Likewise, large heterochromatic nucleoli were observed in the follicle cells but not in S. cyanus. This finding and the high heterochromatin content of reproductive cells in the red vizcacha rat is probably associated with its genome complexity so that redundant genetic information is silenced through heterochromatinization
dc.formattext/html
dc.languageen
dc.publisherSociedad de Biología de Chile
dc.relation10.4067/S0716-97602004000500006
dc.rightsinfo:eu-repo/semantics/openAccess
dc.sourceBiological Research v.37 n.4 suppl.A 2004
dc.subjectnucleotypic effects
dc.subjectoogenesis
dc.subjectspermatogenesis
dc.subjectOctodontidae
dc.subjectTympanoctomys barrerae
dc.subjecttetraploidy
dc.titleGametogenesis and nucleotypic effects in the tetraploid red vizcacha rat, Tympanoctomys barrerae (Rodentia, Octodontidae)


This item appears in the following Collection(s)

Show simple item record