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Título: | Abnormal Spermatid Formation in the Presence of the Parasitic B24 Chromosome in the Grasshopper Eyprepocnemis plorans |
Autor: | Teruel, M.; Cabrero, J.; Perfectti, F.; Alché Ramírez, Juan de Dios CSIC ORCID; Camacho, Juan Pedro M. | Palabras clave: | Aberrant spermatids B chromosomes Eyprepocnemis Grasshopper |
Fecha de publicación: | 2009 | Editor: | S. Karger AG | Citación: | Sexual Development 3(5): 284-289 (2009) | Resumen: | 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. | Descripción: | 6 páginas, 3 figuras, 2 tablas. | Versión del editor: | http://dx.doi.org/10.1159/000253307 | URI: | http://hdl.handle.net/10261/32762 | DOI: | 10.1159/000253307 | ISSN: | 1661-5425 |
Aparece en las colecciones: | (EEZ) Artículos |
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