Ultrastructure of male reproductive accessory glands and ejaculatory duct in the Queensland fruit fly,Bactrocera tryoni (Diptera: Tephritidae) |
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| Authors: | Preethi Radhakrishnan Daniela Marchini Phillip W. Taylor |
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| Affiliation: | 1. Centre for the Integrative Study of Animal Behaviour, Macquarie University, Sydney, NSW 2109, Australia;2. Dipartimento di Biologia Evolutiva, Università di Siena, Siena, Italy;1. SNSB – Bavarian State Collection of Zoology, Münchhausenstraße 21, 81247 München, Germany;2. Ludwig-Maximilians-Universtity, Biocenter, Großhaderner Straße 2, 82152 Planegg-Martinsried, Germany;3. Department of Life Sciences, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy;1. Department of Life Sciences, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy;2. Sugadaira Montane Research Center, University of Tsukuba, Sugadaira Kogen, Ueda, Nagano 386-2204, Japan;3. Institut für Spezielle Zoologie und Evolutionsbiologie mit Phyletischem Museum, Friedrich-Schiller-Universität Jena, Ebertstrasse 1, D-07743 Jena, Germany;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;1. Departamento de Biologia Geral, Universidade Federal de Viçosa, 36570-900, Viçosa, Minas Gerais, Brazil;2. Dipartimento Scienze Della Vita, Università Degli Studi di Siena, Via Aldo Moro 2, 53100, Siena, Italy;1. Department of Life Sciences, University of Siena, Via A. Moro 2, 53100, Siena, Italy;2. Department of Biology, Ecology and Earth Sciences, Di.B.E.S.T., University of Calabria, Via P. Bucci, Cubo 4B, 87036, Rende, Italy |
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| Abstract: | Ultrastructure of male reproductive accessory glands and ejaculatory duct in the Queensland fruit fly (Q-fly), Bactrocera tryoni, were investigated and compared with those of other tephritid flies. Male accessory glands were found to comprise one pair of mesodermic glands and three pairs of ectodermic glands. The mesodermic accessory glands consist of muscle-lined, binucleate epithelial cells, which are highly microvillated and extrude electron-dense secretions by means of macroapocrine transport into a central lumen. The ectodermic accessory glands consist of muscle-lined epithelial cells which have wide subcuticular cavities, lined with microvilli. The electron-transparent secretions from these glands are first extruded into the cavities and then forced out through small pores of the cuticle into the gland lumen. Secretions from the two types of accessory glands then flow into the ejaculatory duct, which is highly muscular, with epithelial cells rich in rough endoplasmic reticulum and lined with a thick, deeply invaginated cuticle. While there are some notable differences, reproductive accessory glands of male Q-flies generally resemble those of the olive fruitfly, Bactrocera oleae, and to a lesser extent the Mediterranean fruit fly, Ceratitis capitata. |
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