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Plant Physiology 72:746-749 (1983)
© 1983 American Society of Plant Biologists

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Articles

Inhibition of Phytoalexin Synthesis in Arachidonic Acid-Stressed Potato Tissue by Inhibitors of Lipoxygenase and Cyanide-Resistant Respiration 1

David A. Stelzig, Robert D. Allen and Satish K. Bhatia

Division of Plant and Soil Sciences, West Virginia University, Morgantown, West Virginia 26506, Department of Biology, West Virginia University, Morgantown, West Virginia 26506

Arachidonic acid-stressed potato tuber discs synthesized the phytoalexin rishitin. This synthesis was inhibited by salicylhydroxamic acid (SHAM), and to a lesser extent by tetraethylthiuram disulfide (disulfiram). Disulfiram was less effective apparently because it was inactivated in the tuber discs. Disulfiram and SHAM both inhibited cyanide-resistant respiration of whole potato discs and lipoxygenase extracted from these discs. When low disulfiram concentrations were used, the lipoxygenase inhibition was quickly overcome, again because the disulfiram apparently was inactivated by oxidation.

1 Supported with funds appropriated under the Hatch Act. Published with the approval of the Director of the West Virginia Agricultural and Forestry Experiment Station as Scientific Article No. 1736.






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Copyright © 1983 by the American Society of Plant Biologists