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Plant Physiology 76:735-738 (1984)
© 1984 American Society of Plant Biologists

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Phenol Metabolism, Phytoalexins, and Respiration in Potato Tuber Tissue Treated with Fatty Acid 1

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

Division of Plant and Soil Sciences, West Virginia University, Morgantown, West Virginia 26506-6108, Department of Biology, West Virginia University, Morgantown, West Virginia 26506-6108

Potato (solanum tuberosum L. cv Katahdin) tuber discs treated with arachidonic acid become necrotic and accumulate sesquiterpenoid phytoalexins. The arachidonic acid also causes increases in both phenylalanine ammonia lyase and lignin, but no change in total alcohol-soluble phenols. Linoleic acid does not alter any of these parameters. A high concentration of nonanoic acid promotes both necrosis and accumulation of low levels of phytoalexins, but decreased levels of phenols, phenylalanine ammonia lyase, and lignin. The respiration of the control discs and those treated with linoleic acid declines by 24 hours after treatment, but the respiration of arachidonic acid-treated discs remains constant for at least 48 hours.

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. 1876.




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