Abstract
The study of morphological features of highly eusocial bees has helped to answer a series of questions concerning their biology. The labor division places the females into two castes, queen with reproductive function and worker with a wide variety of tasks. However, in different species and under different conditions, workers can develop ovaries and lay trophic eggs that are eaten by the queen or used to originate males. In this work, the development of the oviducts was monitored in workers and virgin queens of Melipona quadrifasciata anthidioides specimens of different ages to verify whether there is permanent sterility of these queens and workers due to aging. Lateral and common oviducts of virgin queens aged <7, 10, 15, 20, and 25 days old, physogastric queens, nurse, and forager workers were analyzed for histology and ultrastructure. Although the structural organization of the lateral and common oviducts were very similar, differences in width of the cuticle and the degree of chromatin condensation were observed, indicating differences in the development of this organ of the reproductive system between the castes. It was also demonstrated that electron-lucent vesicles appear to be related to the formation of the cuticle that lines the oviducts. Because no cellular death characteristics were found, it can be inferred that the absence of mating of the queens as old as of 25 days of age does not cause permanent sterility.
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This research was supported by Brazilian Research Agencies National Council of Research (CNPq) and Minas Gerais State Research Agency (FAPEMIG).
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Serrão, J.E., Naves, A.P. & Zanuncio, J.C. Modifications in the oviducts of workers and queens of Melipona quadrifasciata anthidioides (Hymenoptera: Apidae) with different ages. Protoplasma 248, 767–773 (2011). https://doi.org/10.1007/s00709-010-0245-2
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DOI: https://doi.org/10.1007/s00709-010-0245-2