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

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

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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 m&m speckled eggs 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 grapevine colour saree structural class of resistance genes known in A.

thaliana.