Canadian Journal of Plant Pathology (2008) 30, 206-213

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A.J. Foster, M.R. McDonald and G.J. Boland (2008)
Disease progression of sclerotinia rot of carrot, caused by Sclerotinia sclerotiorum, from shoot to root before and after harvest
Canadian Journal of Plant Pathology 30 (2), 206-213
Abstract: Sclerotinia rot of carrot, caused by Sclerotinia sclerotiorum, is an economically important disease that causes yield loss in stored carrots. To examine the relationship between infection of leaves in the field and disease development in roots, the histopathology of sclerotinia rot within carrot crowns was investigated. Petioles of mature greenhouse-grown carrots were inoculated with mycelium of S. sclerotiorum. Disease progression was monitored in carrots in the greenhouse and in carrots that were harvested and placed in cold storage at 4 °C. Disease progressed more rapidly through carrot crowns in storage than in carrots in the greenhouse, and this differential reaction was associated with changes in tissue response to infection. A thick layer of cells that stained red with safranin O and a zone of leaf abscission were observed at the base of infected petioles of carrots that remained in the greenhouse, and these responses were associated with restricted disease progress. Cellular staining occurred rarely and leaf abscission was not detected in carrots that were harvested and placed in cold storage. These results demonstrate a possible preharvest resistance response to S. sclerotiorum in carrot, which was absent in carrots that were harvested and placed in cold-storage conditions. This study contributes to an improvement in understanding of the differential development of this disease in carrots before and after harvest.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Greg J. Boland, Mary Ruth McDonald

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Sclerotinia sclerotiorum Carrot (Daucus carota)