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Defaecation in a Passively-Feeding Plant Nematode, Hexatylus Viviparus (Neotylenchidae : Tylenchida)

Defaecation in a Passively-Feeding Plant Nematode, Hexatylus Viviparus (Neotylenchidae : Tylenchida) DEFAECATION IN A PASSIVELY-FEEDING PLANT NEMATODE, HEXATYLUS VIVIPARUS (NEOTYLENCHIDAE : TYLENCHIDA) BY Malcolm K. SEYMOUR Rothamsted Experimental Station, Harpenden, Herts., England Rectal movements in Hexatylus viviparus associated with ejection of intestinal contents have been analysed from ciné film. Every 15-20 min during feeding on fungal hyphae about ten defaecation cycles occur, when the rectum bows dorsally and liquid and fungal globules are expelled. Con- currently about 60 rectal pumping cycles eject small quantities of liquid only, with the rectum straight. The two processes seem under independent control and are asynchronous, (rectal pumping being usually slightly faster) so that they "interfere" and produce a jerky overall movement. H. viviparus has a low body pressure and is passively fed from high pressure fungus cells; rectal pumping is thought to help keep body pressure low for feeding. A closable prerectum and prerectal valve, required to limit volume of faeces expelled from a high pressure nematode, are absent from H. viviparus. Lee (1965) said that in most nematodes a high body pressure was responsible for expelling faeces "with considerable force". Earlier, Lee (1958) had described how a posterior part of the intestine, the prerectum, closed off behind an intestinal sphincter region during http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematologica Brill

Defaecation in a Passively-Feeding Plant Nematode, Hexatylus Viviparus (Neotylenchidae : Tylenchida)

Seymour, Malcolm K.
Nematologica , Volume 20 (3): 6 – Jan 1, 1974
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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0028-2596
eISSN
1875-2926
DOI
10.1163/187529274X00393
Publisher site
See Article on Publisher Site

Abstract

DEFAECATION IN A PASSIVELY-FEEDING PLANT NEMATODE, HEXATYLUS VIVIPARUS (NEOTYLENCHIDAE : TYLENCHIDA) BY Malcolm K. SEYMOUR Rothamsted Experimental Station, Harpenden, Herts., England Rectal movements in Hexatylus viviparus associated with ejection of intestinal contents have been analysed from ciné film. Every 15-20 min during feeding on fungal hyphae about ten defaecation cycles occur, when the rectum bows dorsally and liquid and fungal globules are expelled. Con- currently about 60 rectal pumping cycles eject small quantities of liquid only, with the rectum straight. The two processes seem under independent control and are asynchronous, (rectal pumping being usually slightly faster) so that they "interfere" and produce a jerky overall movement. H. viviparus has a low body pressure and is passively fed from high pressure fungus cells; rectal pumping is thought to help keep body pressure low for feeding. A closable prerectum and prerectal valve, required to limit volume of faeces expelled from a high pressure nematode, are absent from H. viviparus. Lee (1965) said that in most nematodes a high body pressure was responsible for expelling faeces "with considerable force". Earlier, Lee (1958) had described how a posterior part of the intestine, the prerectum, closed off behind an intestinal sphincter region during

Journal

Nematologica – Brill

Published: Jan 1, 1974

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