Spermatogenesis in the parasitoid Diachasmimorpha longicaudata (Hymenoptera: Braconidae) |
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| Authors: | Leonela Carabajal Paladino Fabiana Lo Nostro Alba Papeschi Jorge Cladera María José Bressa |
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| Institution: | 1. Instituto de Genética “Ewald A. Favret”, Instituto Nacional de Tecnología Agropecuaria (INTA‐Castelar), Nicolás Repetto y de los Reseros s/n (1686), Hurlingham, Buenos Aires, Argentina;2. Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Pabellón II Ciudad Universitaria (C1428EGA), Ciudad Autónoma de Buenos Aires, Argentina;3. Instituto de Biodiversidad y Biología Experimental y Aplicada, Consejo Nacional de Investigaciones Científicas y Técnicas – Universidad de Buenos Aires, Pabellón II Ciudad Universitaria, Intendente Güiraldes 2160 (C1428EGA), Ciudad Autónoma de Buenos Aires, Argentina;4. Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II Ciudad Universitaria Intendente G?iraldes 2160, (C1428EGA), Ciudad Autónoma de Buenos Aires, Argentina;5. Instituto de Ecología, Genética y Evolución de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas – Universidad de Buenos Aires, Intendente Güiraldes 2160, Pabellón II Ciudad Universitaria (C1428EGA), Ciudad Autónoma de Buenos Aires, Argentina |
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| Abstract: | The study of spermatogenesis in Hymenoptera is limited to few taxa due to limitations to access the material in the right stage for analysis. The information available up to now states that the gametogenesis in males involves a modified meiosis, similar to mitosis. This is due to the haplodiploid sex determination system present in the order, where females are diploid and males are haploid. In the present work, we examined the spermatogenesis process in the parasitoid Diachasmimorpha longicaudata (Ashmead) (Hymenoptera: Braconidae). We performed squash preparations from testes of individuals from the third larval instar until the adult stage. Some cytological traits, such as the presence of a monopolar spindle, were analysed in detail by means of histological semi‐thin sections. The spermatogenesis in this species comprises an abortive first division with the formation of an anucleated cytoplasmic bud and a nucleated cell, and an equal second division of the nucleated cell, leading to the generation of two mature spermatozoa. The results presented herein provide more information about the process of spermatogenesis in Hymenoptera, which has not been studied in depth in parasitic species. |
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| Keywords: | Hymenoptera modified meiosis abortive division |
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