These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Parasitism of Lacanobia oleracea (Lepidoptera) by the ectoparasitoid, Eulophus pennicornis, is associated with a reduction in host haemolymph phenoloxidase activity.
    Author: Richards EH, Edwards JP.
    Journal: Comp Biochem Physiol B Biochem Mol Biol; 2000 Nov; 127(3):289-98. PubMed ID: 11126759.
    Abstract:
    When haemolymph from fifth instar Lacanobia oleracea was incubated in vitro, rapid melanization occurred. Similar levels of melanization occurred in haemolymph from larvae that had been experimentally injected with venom from the ectoparasitic wasp, Eulophus pennicornis. In contrast, haemolymph from larvae parasitized by this wasp melanized more slowly and less extensively. Phenoloxidase assays indicated that enzyme activity was present in haemocyte lysate supernatants, serum and plasma from L. oleracea and that on day 5 post-parasitization, fractions prepared from parasitized larvae had significantly less phenoloxidase activity than similar fractions from untreated or experimentally envenomated larvae. In addition, no PO activity was detectable in wasp venom, and the venom had no effect on L. oleracea plasma phenoloxidase activity in vitro. These results indicate that parasitism of L. oleracea by E. pennicornis suppresses host haemolymph phenoloxidase activity and that this suppression is not induced by adult wasp venom. The results are discussed with reference to the survival advantages of suppressing the activity of this host enzyme, and to the possible source(s) of putative suppressive factors.
    [Abstract] [Full Text] [Related] [New Search]