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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
Nematologica – Brill
Published: Jan 1, 1971
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