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Carbohydrate/lectin interactions between the nematophagous fungus, Arthrobotrys oligospora, and the infective juveniles of Trichostrongylus colubriformis (Nematoda)

Published online by Cambridge University Press:  06 April 2009

D. A. Wharton  and
D. S. Murray
D. A. Wharton
Affiliation:
Department of Zoology, University of Otago, P.O.Box 56, Dunedin, New Zealand
D. S. Murray
Affiliation:
Department of Zoology, University of Otago, P.O.Box 56, Dunedin, New Zealand
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Summary

Removal of the sheath of the ensheathed infective juvenile of Trichostrongylus colubriformis prevents capture by the nematophagous fungus Arthrobotrys oligospora. Exposure of the trap hyphae to a variety of saccharides, which may block a recognition system based on lectin/carbohydrate binding, failed to prevent capture but some saccharides did inhibit penetration and invasion by the fungus. Capture and penetration thus appear to be two distinct processes with capture being less specific than penetration. Carbohydrate residues were absent from the outer surface of the cuticle and the sheath but were present on the inner surface of the sheath. The limited accessibility of these lectin-binding sites may explain the slow process of infection of the infective juvenile by the fungus. The sheath does not protect the infective juvenile against attack by this nematophagous fungus.

Keywords

Arthrobotrys oligosporaTrichostrongylus colubriformisnematophagous fungustrichostrongyle nematodesheathbiological controllectin/carbohydrate binding
Type
Research Article
Information
Parasitology , Volume 101 , Issue 1 , August 1990 , pp. 101 - 106
Copyright
Copyright © Cambridge University Press 1990

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