An Attempt to Predict Response of Sunflowers to Races of Plasmopara halstedii Using Cultured Sunflower Cells |
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| Authors: | A Bruce Gray W E Sackston |
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| Institution: | Department of Biology, Nova Scotia Agricultural College, Truro, Nova Scotia, B2N 5E3;Department of Plant Science, Macdonald College of McGill University, 21, 111 Lakeshore Road, Ste-Anne-de-Bellevue, Quebec H9X 1CO (Canada). |
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| Abstract: | Cultured sunflower cells reacted alike to inoculation in compatible and incompatible combinations with three races of Plasmopara halstedii, cause of downy mildew. Infection structures formed on the surfaces of cells derived from both resistant and susceptible sunflowers, but no intracellular fungal structures or other signs of penetration were evident in either case. There was no indication of a hypersensitive reaction (rapid death) in cells within 20 h of inoculation in incompatible combinations. The reaction of cells in culture was not like that of intact plants in either compatible or incompatible combinations. |
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