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Histological and Ultrastructural Changes in Cereal Roots Caused By Feeding of Helicotylenchus Spp

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Parasitism of cereal roots by Helicotylenchus spp. induced two types of lesion, a cortical necrosis in which nematodes physically disrupted cells allowing contamination by secondary micro-organisms, and a small feeding lesion, of up to five cells, around a central food cell in which both the cytoplasm and numbers of cell organelles had increased. Lipid droplets and proteinaceous deposits occurred in food cells. Feeding lesions were usually adjacent to protoxylem cells. The stylet pierced the food cell and a droplet, assumed to be the dorsal gland exudate, enveloped the stylet tip. The droplet was structureless but whorls of rough endoplasmic reticulum connected the droplet and the cytoplasm. The functioning of the food cell, and the role of the gland exudate are discussed, and structural changes are compared with those of sedentary feeding plant-parasitic nematodes.

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

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/content/journals/10.1163/187529278x00515
1978-01-01
2016-09-26

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