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Feeding Mechanisms of Aphelenchoides Bicaudatus On Three Fungi and an Alga

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For more content, see Nematology.

A comparison of the feeding mechanisms of A. bicaudatus was made on the fungi, Pyrenochaeta terrestris, Sporobolomyces sp., Hansenula saturnus, and the alga, Stichococcus bacillaris. The nematode fed briefly and the feeding mechanism, involving an exploration and penetration phase and an ingestion phase, was similar on all four microorganisms. A. bicaudatus removed the host cell contents mechanically and no injection of glandular secretions into the cell by the nematode was observed. The nematode oriented its stylet against the cell wall at a right angle to the cell surface and only a minimal lip contact with the cell surface was necessary for penetration. Metacorporal pulsations were associated with stylet protrusion and resulted from action of its radial muscles. Duration of feeding, number of thrusts required for penetration and rate of metacorporal pulsations varied with the organism used as food. Feeding on P. terrestris, Sporobolomyces sp., H. saturnus and S. bacillaris on an average lasted for 21, 28, 4 and 5 sec, respectively. A recurrent contraction and re-elongation of the tail region caused a back and forth movement of intestinal lumen contents.

Affiliations: 1: Department of Plant Pathology, University of Illinois, Urbana, Illinois, U.S.A.


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