Evidence of a procentriole during spermiogenesis in the coccinellid insect Adalia decempunctata (L): An ultrastructural study |
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| Institution: | 1. Dipartimento Scienze della Vita, Università degli Studi di Siena, Via Aldo Moro 2, 53100, Siena, Italy;2. Departamento de Biologia Geral, Universidade Federal de Viçosa, 36570-900, Viçosa, Minas Gerais, Brazil;3. Departamento de Ciências Biológicas, Universidade Federal de Ouro Preto, Campus Universitário Morro do Cruzeiro, CEP, 35400-000, Ouro Preto, MG, Brazil;1. Consiglio per la Ricerca in Agricoltura e l’analisi dell’economia agraria, Centro di Ricerca per l’Agrobiologia e la Pedologia (CREA-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;3. Department of Agriculture, University of Sassari, viale Italia 39, 07100 Sassari, Italy;1. Department of Plant and Animal Production, Espiye Vocational School, Giresun University, 28600 Giresun, Turkey;2. Department of Biology, Faculty of Sciences, Karadeniz Technical University, 61080 Trabzon, Turkey;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: | We studied spermatogenesis and spermiogenesis in Adalia decempunctata (L), a beetle of the Coccinellidae family. The spermatocyte exhibits two centrioles which elongate to form a pair of primary cilia. A novel structure, appearing in cross sections as a dense droplet, is observed near the long centriole during spermiogenesis, and is soon accompanied by a procentriole (PCL). PCL structure consists of singlet microtubules, a central tubule and an incomplete cartwheel. The PCL persists until the end of spermiogenesis, when it vanishes together with the dense droplet. The sperm has an exceptionally long basal body and the nucleus is disposed parallel to the flagellar components, a peculiar trait shared by other species of the coccinellid group. The presence of a procentriole suggested by the use of antibodies is discussed. |
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| Keywords: | Insect spermatogenesis and spermiogenesis Centriole and procentriole Sperm ultrastructure |
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