Capture and penetration processes of the free-living juveniles of Trichostrongylus colubriformis (Nematoda) by the nematophagous fungus, Arthrobotrys oligospora.
The nematode-trapping fungus Arthrobotrys oligospora traps and invades all the free-living juvenile stages of the trichostrongyle nematode Trichostrongylus colubriformis. The processes of capture and invasion of the 1st-stage juveniles are described using differential interference contrast optics and 3-D reconstruction techniques. The adhesive responsible for capture is well preserved using a freeze-substitution technique for scanning electron microscopy. The invasion process of the ensheathed 3rd-stage juvenile of T. colubriformis takes much longer than in the 1st- or 2nd-stage juvenile and involves the formation of secondary infection pegs between the sheath and the cuticle which appear to penetrate the cuticle by physical pressure.
Murray
D S
DS
Department of Zoology, University of Otago, Dunedin, New Zealand.
Wharton
D A
DA
D000818:Animals; D007091:Image Processing, Computer-Assisted; D008838:Microcomputers; D008855:Microscopy, Electron, Scanning; D003904:Mitosporic Fungi / Q000502:physiology* / Q000648:ultrastructure; D010572:Pest Control, Biological; D014254:Trichostrongylus / Q000502:physiology* / Q000648:ultrastructure