Effect of the R-3 Gene in Resistance of the Wauseon Potato Tuber to Phytophthora infestans

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Abstract
Tuber tissue of potato cultivar ''Wauseon'', which has R1R3 resistance genes, was compatible with P. infestans race 1, even though incompatibility was predicted from its foliar reaction to that pathogen. When challenged by P. infestans race 4, ''Wauseon'' tuber slices developed a penetrating necrosis and showed a high accumulation of the terpenoids, phytuberin, and katahdinone. The susceptibility of ''Wauseon'' tubers to race 1 exemplify van der Plank''s contention that the tubers of R3 potato cultivars may not be as resistant as is its foliage to this race. In the compatible interaction of ''Wauseon'' with race 1, production of rishitin is almost equal to that produced during the hypersensitive response of Kennebec (R1) to race 4. This suggests that rishitin is not the primary factor involved in the resistance of potato tubers to races of P. infestans.

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