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Differential Sensitivity of Fungi to Pisatin and to Phaseollin. Hans D. VanEtten, Assistant Professor, Plant Pathology Department, Cornell University, Ithaca, N.Y. 14850; Phytopathology 63:1477-1482. Accepted for publication 17 May 1973. DOI: 10.1094/Phyto-63-1477.

Forty-six fungal isolates representing 13 species were tested for their tolerance to pisatin, and 33 Fusarium isolates representing three species were tested for their tolerance to phaseollin. In general, pea pathogens were more tolerant of pisatin than were nonpathogens of pea and bean pathogens were more tolerant of phaseollin than nonpathogens of bean. There were, however, several notable exceptions. Aphanomyces euteiches, a pathogen of pea, was markedly inhibited by pisatin, whereas several nonpathogens of pea were highly tolerant of pisatin. In addition, several nonpathogens of bean were highly tolerant of phaseollin. The antifungal properties of both pisatin and phaseollin also depended on the bioassay conditions.

Additional keywords: phytoalexins, Phaseolus vulgaris, Pisum sativum, pterocarpan.