Plant Protect. Sci., 2002, 38(11):474-476 | DOI: 10.17221/10527-PPS

Albugo candida (white rust) suppresses resistance to downy mildew pathogens in Arabidopsis thaliana

Cooper A.J., A. Woods-Tör, E.B. Holub
Species Level Resistance Group, Horticulture Research International, Wellesbourne, Warwick, CV35 9EF, United Kingdom

Arabidopsis thaliana accessions were inoculated with incompatible isolates of downy mildews, following pre-inoculation with compatible Albugo candida. Three isolates of Hyaloperonospora parasitica subsp. A. thaliana, an isolate of H. parasitica subsp. Brassica oleracea and one Bremia lactucae (lettuce) isolate were included. All downy mildews sporulated on A. thaliana, suggesting A. candida suppresses broad-spectrum downy mildew resistance. The white rust resistance gene, RAC5, is being investigated. The resistance phenotype associated with RAC5 seems not to involve a hypersensitive response. RAC5 has been mapped telomeric of nga106 on chromosome 5, in a region lacking NB-LRR genes, the most common structural class of resistance genes known in A. thaliana.

Keywords: Arabidopsis thaliana; Albugo candida; downy mildew; Hyaloperonospora parasitica; Bremia lactucae; host cell death; compatibility

Published: December 31, 2002  Show citation

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Cooper AJ, Woods-Tör A, Holub EB. Albugo candida (white rust) suppresses resistance to downy mildew pathogens in Arabidopsis thaliana. Plant Protect. Sci. 2002;38(SI 2 - 6th Conf EFPP):474-476. doi: 10.17221/10527-PPS.
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