Ultrastructure of wilt syndrome caused by Verticillium dahliae. III. Chronological symptom development in sunflower leaves
- 15 January 1977
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Botany
- Vol. 55 (2), 139-152
- https://doi.org/10.1139/b77-022
Abstract
When sunflowers are infected by the vascular pathogen Verticillium dahliae, the first visible foliar symptom is the appearance of tiny chlorotic flecks. An attempt was made to determine the temporal order in which early ultrastructural changes leading to symptom expression occur. The evidence indicates that ultrastructural changes occur in the following order: (1) degradation of xylem vessel walls, (2) initiation of the necrotic band, (3) degeneration of the mesophyll tissue remote from the vein, and (4) degeneration of the phloem. The possible importance of xylem vessel plugs and of phenolic compounds to the initiation of symptom development is also discussed.This publication has 2 references indexed in Scilit:
- Transmission electron microscopy of Verticillium albo-atrum hyphae in xylem vessels of tomato plantsPhysiological Plant Pathology, 1976
- Pectic and Cellulolytic Enzymes in Plant DiseaseAnnual Review of Plant Physiology, 1960