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Host-Pathogen Interactions

XII. Response of Suspension-cultured Soybean Cells to the Elicitor Isolated from Phytophthora megasperma var. sojae, a Fungal Pathogen of Soybeans ¹

^a Department of Chemistry and Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Colorado 80302

The glucan elicitor isolated from the mycelial walls of Phytophthora megasperma var. sojae, the fungus which causes stem and root rot in soybeans, stimulates the activity of phenylalanine ammonia-lyase and the accumulation of glyceollin in suspension-cultured soybean cells. Nigeran, a commercially available fungal wall glucan, was the only other compound tested which has any activity in this system. Glyceollin is a phenylpropanoid-derived phytoalexin which is toxic to P. megasperma var. sojae. Evidence is presented to support the hypothesis that the action of elicitors in stimulating phytoalexin synthesis is not species or variety specific but, rather, is part of a general defensive response of plants.

³ Present address: Swedish Forest Products Research Laboratory, Box 5604, S-114 86, Stockholm, Sweden.

⁴ To whom reprint requests should be addressed at the Department of Chemistry.

¹ Research was supported by the National Science Foundation (BMS73-02208), the Herman Frasch Foundation, New York City, the Energy Research and Development Administration (E[11-1]-1426), a Deutsche Forschungsgemeinschaft Fellowship to J. E., and a University of Colorado Faculty Fellowship to P. A.

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