2024-03-29T08:13:13Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/327622013-12-12T09:48:10Zcom_10261_59com_10261_6col_10261_312
Abnormal Spermatid Formation in the Presence of the Parasitic B24 Chromosome in the Grasshopper Eyprepocnemis plorans
Teruel, M.
Cabrero, J.
Perfectti, F.
Alché Ramírez, Juan de Dios
Camacho, Juan Pedro M.
Aberrant spermatids
B chromosomes
Eyprepocnemis
Grasshopper
6 páginas, 3 figuras, 2 tablas.
Morphology and size of spermatids were analysed in the grasshopper Eyprepocnemis plorans by means of light and electron microscopy. At light microscopy, normal and abnormal (macro- and micro-) spermatids differed in size and number of centriolar adjuncts (CAs): 1 CA in normal spermatids and 2 or more CAs, depending on ploidy level, in macrospermatids. Males carrying the additional B24 chromosome showed significantly more macro- and microspermatids than 0B males. The frequency of macro- and microspermatids showed an odd-even pattern in respect to the number of B chromosomes, with a higher frequency of abnormal spermatids associated with odd B numbers. Transmission electron microscopy showed that macrospermatids carried more than one axoneme, depending on ploidy level: 2 for diploid, 3 for triploid, and 4 for tetraploid spermatids. In 0B males, the most frequent abnormal spermatids were diploid, whereas in 1B males they were the tetraploid spermatids and, to a lesser extent, triploid ones. This suggests that most macrospermatids derived from cytokinesis failure and nucleus restitution. The implications of aberrant spermatids on B chromosome transmission and male fertility are discussed.
Peer reviewed
2011-02-24T10:49:11Z
2011-02-24T10:49:11Z
2009
artículo
http://purl.org/coar/resource_type/c_6501
Sexual Development 3(5): 284-289 (2009)
1661-5425
http://hdl.handle.net/10261/32762
10.1159/000253307
en
http://dx.doi.org/10.1159/000253307
none
S. Karger AG