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Physiology and Biochemistry

Relation Between Production of Extracellular Kievitone Hydratase by Isolates of Fusarium and Their Pathogenicity on Phaseolus vulgaris. D. A. Smith, Plant Pathology Department, University of Kentucky, Lexington 40546; J. M. Harrer(2), and T. E. Cleveland(3). (2)(3)Plant Pathology Department, University of Kentucky, Lexington 40546. Phytopathology 72:1319-1323. Accepted for publication 1 March 1982. Copyright 1982 The American Phytopathological Society. DOI: 10.1094/Phyto-72-1319.

Twenty-eight wild-type isolates of Fusarium and Nectria were surveyed for ability to produce kievitone hydrate from the phytoalexin kievitone and for their pathogenicity towards Phaseolus vulgaris. In culture, at least 14 of the isolates were able to form kievitone hydrate, but only three were highly virulent on bean. Similarly, only three of the 28 isolates yielded cell-free culture filtrates capable of producing kievitone hydrate; these same three isolates were the most aggressive pathogens. Kievitone hydratase appeared to be the enzyme involved in each instance of extracellular production of kievitone hydrate.

Additional keywords: Fusarium solani f. sp. phaseoli, metabolism, Nectria haematococca, phytoalexin, phytoalexin detoxification.