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Plant Physiology 55:646-651 (1975)
© 1975 American Society of Plant Biologists

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Articles

Isolation and Characterization of Stemphylin, a Chromone Glucoside from Stemphylium botryosum1

Isaac Barash2, Arthur L. Karr, Jr.3 and Gary A. Strobel4

a Department of Plant Pathology, Montana State University, Bozeman, Montana

A phytotoxic compound was isolated from a liquid culture medium of Stemphylium botryosum, a pathogen of lettuce. The toxin is an amorphous yellow solid with absorbance maxima at 218, 268, and 427.5 nm and exhibits a bathochromic shift in alkaline pH. It has a molecular weight of 370 and an empirical formula of C17H22O9. Glucose and aromatic pigments are detected after acid hydrolysis. Based on its spectral and chemical properties, the proposed structure of the toxin is 3-hydroxy- 2,2-dimethyl-5-{alpha}-D-glucopyranoside-2,3-dihydrochromone, and it has been given the trivial name stemphylin. A linear relationship exists between lesion area and amount of toxin applied to a young lettuce leaf. The relationship between toxin production and the development of disease symptoms is discussed.

2 On sabbatical leave from the Department of Botany, Tel-Aviv University, Israel.

3 Present address: Department of Plant Pathology, University of Missouri, Columbia, Mo. 65201.

4 Public Health Service Research Career Development Awardee 1K4-GM42, 475-05, from the National Institute of General Medical Sciences.

1 This work was supported in part by National Science Foundation Grant GB 43192 and United States Department of Agriculture Cooperative States Research Service Grant C145-2575, and is paper No. 538 of the Montana Agricultural Experiment Station.






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Copyright © 1975 by the American Society of Plant Biologists