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Feeding of Longidor Us Elongatus and L. Leptocephal Us On Root-Tip Galls of Perennial Ryegrass (Lolium Perenne)

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For more content, see Nematology.

Longidorus elongatus and L. leptocephalus fed only at the root-tip of perennial ryegrass growing in agar. Galls were usually fed upon by several nematodes. Feeding behaviour was similar for L. elongatus and L. leptocephalus; the root-tip was penetrated by rapid thrusts with the stylet to several cells deep within the root, following which there was a period of inactivity when the nematodes were thought to be salivating. Ingestion followed and continued for long periods without pause, with the odontostyle-tip in the same cell. During most feeds there were two or three periods of ingestion, separated by short (c. 2 min) periods of inactivity. Calculations based on measurements of the oesophageal bulb chamber, assuming 10% pumping efficiency, indicate that a volume equivalent to more than 40 cells may be extracted by a single nematode feeding for 1 h. Ultrastructural studies of galls formed during 8 days by L. elongatus showed that there were many empty cells in which the walls were holed. It is suggested that these holes result from action of the nematode saliva and that their formation eased removal of the contents of cells distant from the odontostyle-tip.

Affiliations: 1: Scottish Crop Research Institute, Invergowrie, Dundee, Scotland


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