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| Format: | Artículo científico |
| Sprache: | en |
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Academia Brasileira de Ciências
2014
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=32732907039 |
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- Cotesia flavipes (CAM) (Hymenoptera: Braconidae) Supresses Immune Responses In Diatraea flavipennella (BOX) (Lepidoptera: Crambidae) ELIANA M. DOS PASSOS VALÉRIA WANDERLEY-TEIXEIRA EDMILSON J. MARQUES ÁLVARO A. C. TEIXEIRA FÁBIO A. BRAYNER Multidisciplinaria (Ciencias Naturales y Exactas) hemocytes parasitoid Encapsulation humoral response Sugarcane Moth Borer (Diatraea saccharalis) The present research aimed to elucidate which aspects of immune responses in Diatraea flavipennella are suppressed by the parasitoid Cotesia flavipes, thus, ensuring parasitism success. We investigated the presence of apoptosis in fat body cells through the TUNEL technique. According to the results, reduced levels of nitric oxide and phenoloxidase activity were observed in larvae parasitized for three days, and reduced total number of hemocytes, after three and seven days. An increase in plasmatocytes and decrease in spherulocytes numbers were observed in the differential count on the third day of parasitism. The number of melanized microspheres in parasitized larvae was low and indicated less intense melanization. The ultrastructural analysis confirmed the immunosuppressive effect of C. flavipes on the encapsulation response of D. flavipennella because only the formation of hemocytes capsules, adhered to the microspheres’ surface, was evidenced in non-parasitized caterpillars. The effect of parasitism was also recorded on the third day with the presence of hemocytes and apoptosis in fat body cells, including aspects of degeneration in the latter. We concluded that C. flavipes suppresses cellular and humoral immunological responses in D. flavipennella and drastically affects the host’s fat tissue. 2014 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32732907039 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.4 Vol.86