Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 69:1435-1438 (1982)
© 1982 American Society of Plant Biologists

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Articles

Alternative Pathway Respiration and Lipoxygenase Activity in Aged Potato Slice Mitochondria 1

Richard M. Shingles2, Geoffrey P. Arron3 and Robert D. Hill4

Department of Plant Science, University of Manitoba, Winnipeg, Canada R3T 2N2

Mitochondrial preparations isolated from aged white potato (Solanum tuberosum L.) slices exhibited classical cyanide-insensitive O2 uptake which was inhibited by salicylhydroxamic acid and tetraethylthiuram disulfide (disulfiram). These mitochondria also possessed lipoxygenase activity, as determined by O2 uptake in the presence of 4 millimolar linoleic acid. Purification of the mitochondrial preparation on a continuous Percoll gradient resulted in a large decrease in lipoxygenase activity whereas cyanide-insensitive (disulfiram sensitive) O2 consumption was still observed. These data indicate that cyanide-insensitive O2 consumption in mitochondrial preparations isolated from aged white potato slices is of mitochondrial origin and not due to lipoxygenase contamination.

2 Present address: Department of Horticultural Science, University of Guelph, Guelph, Canada N1G 2W1.

3 Present address: Chemical Research Division, Ontario Hydro, 800 Kipling Avenue, Toronto, Canada M8Z 5S4.

4 Send reprint requests to Dr. R. D. Hill.

1 Supported by grants from Natural Sciences and Engineering Research Council and Canadian Department of Agriculture.






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