Phytotoxins from the pathogenic fungi Drechslera maydis and Drechslera sorghicola |
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| Authors: | Sugawara F Strobel G Strange R N Siedow J N Van Duyne G D Clardy J |
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| Affiliation: | Department of Plant Pathology, Montana State University, Bozeman, MT 59717. |
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| Abstract: | Drechslera maydis, the causal agent of Southern corn leaf blight, and Drechslera sorghicola, the causal agent of leaf spot on Johnson grass, produce a series of phytotoxic sesterterpenoids. These sesterterpenoids belong to the ophiobolin family. One of them, ophiobolin I, was characterized by x-ray diffraction and served as a crucial reference compound for characterizing four other ophiobolins. All of the ophiobolins studied produce characteristic lesions on host plants at concentrations of 1 mM to 1 μM. The ophiobolin characterized as 6-epiophiobolin A is selectively toxic to corn bearing Texas-male-sterile (Tms) cytoplasm when assayed in a dark CO2 fixation assay. It is plausible that these ophiobolins had a role in the 1970 corn-blight epidemic in North America. |
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