Isolation and partial characterization of a phytotoxic glycoprotein from culture filtrates ofRhynchosporium secalis |
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Authors: | C. Mazars K. D. Hapner G. A. Strobel |
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Affiliation: | (1) Centre de Physiologie Végétale, LA CNRS 241, Université Paul Sabatier, Toulouse, (France);(2) Departments of Plant Chemistry and Plant Pathology, Montana State University, 59717 Bozeman, Montana, USA |
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Abstract: | Summary Rhynchosporium secalis (Oud.) Davis produces a phytotoxic compound with a mol. wt of 275×103 which is able to induce chlorotic symptoms in both susceptible and resistant barley leaves. Collectively, the data suggest that the toxin is a glycoprotein. Mild base treatment, by elimination, indicates that threonine and serine are involved in o-glycosidic linkages with the carbohydrate moiety. Sugar residues occur in the molecule in the ratio of mannose, rhammnose, galactose, glucosamine 13.6111.Acknowledgments. We acknowledge the assistance of Mr M. McNeil and P. Albersheim in doing the sugar analyses shown in this report. Financial support for this project was provided by a BARD grant 1-31-79, the French government, and the Montana Ag. Expt. Station. |
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Keywords: | Rhynchosporium secalis barley scald disease phytotoxin glycoprotein phytotoxic rhynchosporide |
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