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The Feeding Behaviour of Helicotylenchus Spp. On Wheat Roots

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image of Nematologica
For more content, see Nematology.

H. dihystera and H. varicaudatus feed as sedentary parasites. Typically, several cells are penetrated before feeding begins. Cell walls are ruptured by the combination of forward body pressure and piercing the walls by the stylet. After penetration, feeding from a single cell continues for several days, with alternating salivation and ingestion. During ingestion, the dorsal gland secretion is retained within the pro-corporeal region of the gland duct, from where, at the onset of salivation, it passes to the gland ampulla. Nematodes removed from the roots while feeding subsequently salivate in vitro, producing a globular secretion in macerated root extract, and a coiled thread in fixative. These secretions are produced as the dorsal gland ampulla empties.

Affiliations: 1: Imperial College Field Station, Ashurst Lodge, Sunninghill, Ascot, Berkshire, England


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