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Histopathogenesis of Galls Induced By Meloidogyne Naasi in Oat Roots

Histopathogenesis of Galls Induced By Meloidogyne Naasi in Oat Roots HISTOPATHOGENESIS OF GALLS INDUCED BY MELOIDOGYNE NAASI IN OAT ROOTS BY I. A. SIDDIQUI 1 ) Department of Plant Pathology, University of Illinois at Urbana-Champaign, Urbana, Illinois, U.S.A. Large numbers of Meloidogyne naasi larvae penetrated root tips of 'Wintok' oats within the first 24 hours and first sign of incipient giant cell formation was visible 4 days after inoculation. Three independent responses were observed: a) Necrosis of inner cortical and endodermal cells in contact with the nematode lip region and failure of larvae to enter the stele; b) Necrosis of cells around the incipient giant cells, finally resulting in degeneration of giant cells and larvae; c) Uninterrupted giant cell development, which is indistinguishable from that in a susceptible host. These responses indicate that 'Wintok' oats are only partially resistant to M. naasi. Necrosis of host cells around the nematode and "walling-off", or containment, of giant cells are the two most commonly encountered resistant host reactions to Meloidogyne and Heterodera infections (Dean & Struble, 1953; Dropkin & Webb, 1967; Malo, 1967; Rohde, 1965; Endo, 1965; Mankau & Linford, 1960). In contrast, Dropkin (1969) noted that the necrotic response of tomatoes and . other hosts resistant to Meloidogyne was not http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematologica Brill

Histopathogenesis of Galls Induced By Meloidogyne Naasi in Oat Roots

Nematologica , Volume 17 (2): 6 – Jan 1, 1971

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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0028-2596
eISSN
1875-2926
DOI
10.1163/187529271X00080
Publisher site
See Article on Publisher Site

Abstract

HISTOPATHOGENESIS OF GALLS INDUCED BY MELOIDOGYNE NAASI IN OAT ROOTS BY I. A. SIDDIQUI 1 ) Department of Plant Pathology, University of Illinois at Urbana-Champaign, Urbana, Illinois, U.S.A. Large numbers of Meloidogyne naasi larvae penetrated root tips of 'Wintok' oats within the first 24 hours and first sign of incipient giant cell formation was visible 4 days after inoculation. Three independent responses were observed: a) Necrosis of inner cortical and endodermal cells in contact with the nematode lip region and failure of larvae to enter the stele; b) Necrosis of cells around the incipient giant cells, finally resulting in degeneration of giant cells and larvae; c) Uninterrupted giant cell development, which is indistinguishable from that in a susceptible host. These responses indicate that 'Wintok' oats are only partially resistant to M. naasi. Necrosis of host cells around the nematode and "walling-off", or containment, of giant cells are the two most commonly encountered resistant host reactions to Meloidogyne and Heterodera infections (Dean & Struble, 1953; Dropkin & Webb, 1967; Malo, 1967; Rohde, 1965; Endo, 1965; Mankau & Linford, 1960). In contrast, Dropkin (1969) noted that the necrotic response of tomatoes and . other hosts resistant to Meloidogyne was not

Journal

NematologicaBrill

Published: Jan 1, 1971

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