Induction of traps by Ostertagia ostertagi larvae, chlamydospore production and growth rate in the nematode-trapping fungus Duddingtonia flagrans

Journal of Helminthology
J GrønvoldL Fribert

Abstract

Biological control of parasitic nematodes of domestic animals can be achieved by feeding host animals chlamydospores of the nematode-trapping fungus Duddingtonia flagrans. In the host faeces, D. flagrans develop traps that may catch nematode larvae. In experiments on agar, D. flagrans had a growth rate between 15 and 60 mm/week at temperatures between 20 and 30 degrees C. The presence of nematodes induces the fungus to produce traps. The rate of trap formation in D. flagrans has an optimum at 30 degrees C, producing 700-800 traps/cm2/2 days, when induced by 20 nematodes/cm2 on agar. Approaching 10 and 35 degrees C the ability to produce traps is gradually reduced. The response of chlamydospore production on agar to changes in temperature is the same as that for trap formation. On agar, at 10, 20 and 30 degrees C D. flagrans loses its trap inducibility after 2-3 weeks. During the ageing process, increasing numbers of chlamydospores are produced up to a certain limit. The time for reaching maximum chlamydospore concentration coincided with the time for loss of induction potential. The implications of these results in relation to biological control in faeces are discussed.

References


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Citations

Feb 27, 1999·International Journal for Parasitology·M Larsen
Oct 11, 2005·Eukaryotic Cell·Xiaorong Lin, Joseph Heitman
Jul 27, 2011·Revista iberoamericana de micología·María Federica SagüésCarlos Saumell
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Sep 24, 2015·Veterinary Record Open·Perla María Del Carmen Acevedo-RamírezHéctor Quiroz-Romero
Dec 6, 2020·Nature Communications·Arturo Hernández-CervantesChristophe d'Enfert
Feb 8, 2020·The Veterinary Clinics of North America. Food Animal Practice·Joan M Burke, James E Miller
Apr 15, 2021·Journal of Basic Microbiology·Elizabeth Céspedes-GutiérrezDiego F Cortés-Rojas

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