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Suppression of Rishitin and Phytuberin Accumulation and Hypersensitive Response in Potato by Compatible Races of Phytophthora Infestans. J. L. Varns, Department of Biochemistry, Purdue University, Lafayette, Indiana 47906; J. Kuc, Department of Biochemistry and Department of Botany and Plant Pathology, Purdue University, Lafayette, Indiana 47906. Phytopathology 61:178-181. Accepted for publication 8 September 1970. DOI: 10.1094/Phyto-61-178.

A compatible or susceptible interaction is characterized by the suppression of both necrosis and accumulation of rishitin and phytuberin in the potato tuber. An alteration of cellular response in the host during the compatible interaction suppressed the ability of the host to respond normally to a subsequent infection by an incompatible race. Conversely, once the host was inoculated with an incompatible race, suppression from a subsequent infection with a compatible race did not occur. An incubation period of 12 hr is sufficient to either establish suppression or elicit the hypersensitive host response. A compatible interaction also suppressed the hypersensitive host response to sonicated homogenates of the fungus.

Additional keywords: thin-layer chromatography, gas-liquid chromatography, mechanism for susceptibility.