NDLI: Irregular growth forms and cell wall modifications, polygalacturonase detection, and endocell formation in Fusarium oxysporum f. sp. radicis-lycopersici infecting tomato plants, as studied ultrastructurally and cytochemically

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Irregular growth forms and cell wall modifications, polygalacturonase detection, and endocell formation in Fusarium oxysporum f. sp. radicis-lycopersici infecting tomato plants, as studied ultrastructurally and cytochemically

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Mycological Progress : Volume 3, Issue 1, February 2004

Mycological Progress : Volume 2

Mycological Progress : Volume 1

Irregular growth forms and cell wall modifications, polygalacturonase detection, and endocell formation in Fusarium oxysporum f. sp. radicis-lycopersici infecting tomato plants, as studied ultrastructurally and cytochemically

Content Provider	Springer Nature Link
Author	Charest, Pierre M. Ouellette, Guillemond B. Blais, Patrice Chamberland, Hélène
Copyright Year	2004
Abstract	Pathogen cells of Fusarium oxysporum f.sp. radicis-lycopersici infecting container-grown tomato plants were characterized ultrastructurally, using gold-complexed probes, chitinase and wheat germ agglutinin to localize chitin, and polyclonal antibodies to a polygalacturonase to localize this enzyme. It was isolated and purified from the pathogen growing in culture. Many fungal cells were of irregular forms (microhyphal, frondose) with modified, thin or imperceptible lucent wall layers, in which were often included components seemingly of host origin. Gold particles of the polygalacturonase probe were concentrated on portions of penetration hyphae and in areas of associated altered host wall. Fine filamentous-like structures, often linked to fungal cells, reached into extracellular matter and into host walls. Examination of 0.2–0.25 μm-thick sections at 120 kV, and tilted at various angles, indicated that fungal cells frequently had a pronounced wavy contour. Labelling of thin walls for chitin was mostly nil, particularly in contact with host walls, as of also thicker walls in similar situations, or it was then associated with the outside opaque layer. Cells of diverse dimensions with thin or thicker walls and with altered or normal content, contained endocells. Walls of the encodcells and of the enclosing cells often labelled differently for chitin with both probes. Endocells mostly did not originate from proliferation of a living into a dead cell but often ensuing as an apparent fragmentation of the cell content or following its retraction. The bearing of these observations on the host-pathogen relationship, particularly concerning the role of thin-walled hyphae and irregular forms, is discussed.
Starting Page	137
Ending Page	150
Page Count	14
File Format	PDF
ISSN	1617416X
Journal	Mycological Progress
Volume Number	3
Issue Number	2
e-ISSN	18618952
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Microbiology Ecology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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