The sperm of Matsucoccus feytaudi (Insecta,Coccoidea): Can the microtubular bundle be considered as a true flagellum? |
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| Institution: | 1. Consiglio per la Ricerca e la sperimentazione in Agricoltura, Centro di Ricerca per l''Agrobiologia e la Pedologia (CRA-ABP), via di Lanciola 12/a, Cascine del Riccio, 50125 Firenze, Italy;2. Department of Life Sciences, University of Siena, via Aldo Moro 2, 53100 Siena, Italy;1. Medical Faculty, University of Maribor, Taborska ulica 8, SI-2000 Maribor, Slovenia;2. Department of Biology, Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška cesta 160, SI-2000 Maribor, Slovenia;3. Faculty of Chemistry and Chemical Engineering, Smetanova ulica 17, University of Maribor, SI-2000 Maribor, Slovenia;4. Institute of Cell Biology, Histology and Embryology, Research Unit Electron Microscopic Techniques, Medical University of Graz, Harrachgasse 21, Graz A-8010, Austria;1. Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan;2. Sugadaira Montane Research Center, University of Tsukuba, 1278-294 Sugadaira Kogen, Ueda, Nagano 386-2204, Japan;1. Department of Life Sciences, Via A. Moro 2, University of Siena, I-53100 Siena, Italy;2. Sugadaira Montane Research Center, University of Tsukuba, Nagano 386-2204, Japan;3. Institut für Spezielle Zoologie und Evolutionsbiologie, FSU Jena, Erbertstraße 1, 07743 Jena, Germany |
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| Abstract: | In the present work the spermiogenesis and sperm structure of Matsucoccus feytaudi, a primary pest of the maritime pine in southern eastern Europe, is studied. In addition to the already known characteristics of coccid sperm, such as the absence of the acrosome and mitochondria, and the presence of a bundle of microtubules responsible for sperm motility, a peculiar structure from which the microtubule bundle takes origin is described. Such a structure – a short cylinder provided with a central hub surrounded by several microtubules with a dense wall – is regarded as a Microtubule Organizing Centre (MTOC). During spermiogenesis, quartets of fused spermatids are formed; from each spermatid, a bundle of microtubules, generated by the MTOC, projects from the cell surface. Each cell has two centrioles, suggesting the lack of a meiotic process and the occurrence of parthenogenesis. At the end of the spermiogenesis, when the cysts containing bundles of sperm are formed, part of the nuclear material together with the MTOC structure is eliminated. Based on the origin of the microtubular bundle from the MTOC, the nature of the bundle as a flagellum is discussed. |
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| Keywords: | Coccid sperm Scale insects Sperm ultrastructure Insect spermatogenesis TEM MTOC Insect parthenogenesis |
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