Abstract
In the present study, we describe the testis morphology and spermatogenesis of the sugarcane borer, one of the most destructive pests of sugarcane, using light, transmission, and scanning electron microscopies. Diatraea saccharalis (F.) larvae have paired, kidney-shaped testes that are limited externally and divided into four follicles by tunica cells. The adults have two fused whitish and spherical testes that are divided into eight follicles and are composed of spermatogonia, spermatocyte, spermatid, and sperm bundles. The spermatogonia and spermatocyte cysts are located at the apical extremity of the follicle, while the spermatid cysts and sperm bundles are located at the basal extremity of the follicle. Inside of the cysts, which are formed by the somatic cells, the germ line cells develop synchronously and are interconnected by cytoplasmic bridges. Each cyst contains only apyrene or eupyrene, and none of the cysts contain both of the cells. The inner part of the apyrene cyst consists of an electron-dense cap as opposed to a nucleus. The eupyrene sperm contains a nucleus, acrosome, and reticular and lacinate appendages. Both of the sperm types have a “9 + 9 + 2” axoneme and two mitochondrial derivatives at the tail region. The spermatogenesis process and spermatozoa morphology are similar to that of other Lepidoptera.
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Acknowledgments
The authors would like to acknowledge the financial grant received from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ - Process no. 136153/2009-7), the Electron Microscopy Center in UNESP (Botucatu, SP), and Entomology Laboratory of Usina Barra Grande (Lençóis Paulista, SP).
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Edited by Roberto Romani – Univ of Perugia
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Pereira, M.C., Santos, D.C. Testis Morphology and Dichotomic Spermatogenesis in the Sugarcane Borer Diatraea saccharalis (F.) (Lepidoptera: Crambidae). Neotrop Entomol 44, 481–488 (2015). https://doi.org/10.1007/s13744-015-0312-7
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DOI: https://doi.org/10.1007/s13744-015-0312-7