Canadian Forest Service Publications
Disruption of lepidopteran metamorphosis by polydnaviruses. 2001. Béliveau, C.; Cusson, M. Pages 165-171 in Proceedings: 14th International Congress of Comparative Endocrinology: Unity and Diversity. May 26-30, 2001, Sorrento, Italy. H.J.Th. Goos, R.K. Rastogi, H. Vaudry, R. Pierantoni, eds. 5 p.
Issued by: Laurentian Forestry Centre
Catalog ID: 19521
Availability: PDF (download)
It is common for endoparasitic wasps to suppress metamorphosis in their lepidopteran hosts. This developmental pathology is usually induced by wasp-born factors injected into the caterpillar during oviposition. Our laboratory focuses on the effects of a group of dsDNA viruses known as polydnaviruses (PDVs) that replicate in the ovaries of certain ichneumonid and braconid wasps. PDV gene products are believed to be responsible for perturbations of the host endocrine events governing metamorphosis. Here, we briefly review our work on the suppression of Choristoneura fumiferana metamorphosis by the PDV of Tranosema rostrale (TrIV), including data on the hormonal correlates of the larval-pupal transformation, as well as on TrIV gene expression and cloning. We also present new data on the effects of parasitism by T. rostrale on C. fumifera hemolymph protein titers.