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Invasion of Aedes aegypti ovaries by Coelomomyces stegomyiae


, : Invasion of Aedes aegypti ovaries by Coelomomyces stegomyiae. Journal of invertebrate pathology 60(2): 176-184

Aedes aegypti (Diptera, Culicidae) larvae, infected with Coelomomyces stegomyiae (Chytridiomycetes, Blastociadiales), can pupate and eclose to produce adults that carry the fungal infection. In female mosquitoes, fungal hyphae in the hemocoel migrate to the ovaries during the pupal stage and the first 24 to 48 hr of adult life. Hyphae penetrate the ovaries in association with epithelial cells involved in tracheole production during ovarial expansion and maturation. Infected adult female mosquitoes, that have had a blood meal, have 46% lower 20-hydroxyecdysone titers and negligible levels of vitellogenin compared to that of equivalent healthy females. Hyphae of C. stegomyiae mature to resting sporangia in the ovaries of adult Ae. aegypti in response to increased titers of 20-hydroxyecdysone which follow a blood meal. In the absence of a blood meal, maturation of hyphae to resting sporangia in infected adults was induced by injection of 20-hydroxyecdysone.

Accession: 002416564

DOI: 10.1016/0022-2011(92)90093-j

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Related references

Lucarotti, CJ.; Klein, MB., 1988: Pathology of Coelomomyces stegomyiae in adult Aedes aegypti ovaries. Coelomomyces stegomyiae infection in adult females of Aedes aegypti is located primarily in the ovaries. Fungal hyphae do not penetrate the germaria or follicles but instead lie between the tunica propria and epithelial sheath within each ovariole...

Ramos, H.C.; Ribeiro, H.; Novo, T.; Bizarro, J.; Easton, E.R., 1996: First record of genus Coelomomyces in Macau (China): Coelomomyces stegomyiae var. stegomyiae parasitizing Aedes albopictus. During a mosquito survey carried out in 1994-95, in Macau, southern China, Coelomomyces stegomyiae var. stegomyiae was found parasitizing Aedes albopictus. This constitutes the first record of this genus as potential agents of mosquito control in...

Ramos, H.C.; Ribeiro, H.; Novo, T.; Bizarro, J.; Easton, E.R., 1996: First record of genus Coelomomyces in Macau Coelomomyces stegomyiae var stegomyiae parasitizing Aedes albopictus. During a mosquito survey carried out in 1994-95, in Macau, southern China, Coelomomyces stegomyiae var. stegomyiae was found parasitizing Aedes albopictus. This constitutes the first record of this genus as potential agents of mosquito control in...

Lucarotti, C.; Klein, M., 1988: Pathology of Coelomomyces stegomyiae in adult aegypti ovaries. Canadian journal of botany = Journal canadien de botanique 66(5): 877-884

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Shoulkamy, M.A.; Lucarotti, C.J., 1998: Pathology of Coelomomyces stegomyiae in larval Aedes aegypti. Fungi in the genus Coelomomyces infect mosquito larvae and develop within the larval hemocoel. Larvae usually die in the fourth and final instar, by which time, little of the larval fat body remains. To examine this pathology, Aedes aegypti larvae...

Lucarotti, C.J.; Klein, M.B., 1988: Pathology of Coelomomyces stegomyiae in adult Aedes ovaries. Canadian Journal of Botany 66: 7-84

Shoulkamy, M.A.; Lucarotti, C.J.; E.K.atny, M.S.T.; Hassan, S.K.M., 1997: Factors affecting Coelomomyces stegomyiae infections in adult Aedes aegypti. Coelomomyces stegomyiae usually kills its definitive mosquito host, Aedes aegypti, in its fourth and final larval instar. Infected larvae that survive through the pupal stage produce infected adults. The results reported here demonstrate that prod...

Lucarotti, C.J.; Shoulkamy, M.A., 2000: Coelomomyces stegomyiae infection in adult female Aedes aegypti following the first, second, and third host blood meals. Three steps of the proposed mode of action of Bacillus thuringiensis toxins have been studied in Lymantria monacha. We demonstrated that only the toxins that caused typical pathological changes in midgut epithelial cells and bound to the midgut br...

Nnakumusana, ES., 1987: Effects of temperature on the susceptibility of Aedes aegypti (L.) (Diptera: Culicidae) larvae to a mosquito pathogen Coelomomyces stegomyiae in Uganda. The fungus Coelomomyces stegomyiae is reported from Uganda for the first time. Eleven larvae of Aedes aegypti were found infected with C. stegomyiae in a tree hole and pond. Laboratory studies were conducted to determine the susceptibility of vari...