Dihaploid calli from Solanum tuberosum were selected, which were resistant to the culture filtrate of Phytophthora infestans. Each of the resistant calli was resistant to all four pathotypes of Phytophthora used in these experiments. The resistance was not lost through regeneration and the induction of new callus.

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Resistance of potato leaflets to culture filtrates of Phytophthora infestans is correlated with lower growth of the congenial parasite but not with lower sporulation.

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