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Plant Physiology 62:820-825 (1978)
© 1978 American Society of Plant Biologists

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Articles

Effect of Ethylene and Carbon Dioxide on Potato Metabolism

Stimulation of Tuber and Mitochondrial Respiration, and Inducement of the Alternative Path 1

David A. Day, Geoffrey P. Arron, Rolf E. Christoffersen and George G. Laties

Department of Biology and Molecular Biology Institute, University of California, Los Angeles, California 90024

The respiration of potato tubers (Solanum tuberosum var. Russet Burbank) which have been kept at room temperature for 10 days is stimulated upon subsequent treatment with C2H4 (10 microliters per liter) and O2. The respiratory rise reaches a peak in 24 to 30 hours and thereafter declines. Coincident with the rise in tuber respiration is an increase in the respiratory rates of fresh slices and isolated mitochondria. Slices and mitochondria from C2H4- and O2-treated tubers also display substantial resistance to CN, and the resistant respiration is inhibited by hydroxamates.

The longer the tubers are stored after harvest, the less effective is C2H4 in causing CN resistance in slices and mitochondria from treated tubers. Addition of 10% CO2 to the C2H4-O2 mixture, however, causes extensive CN resistance to develop, even in slices and mitochondria from old tubers. The results show that C2H4, O2, and CO2 act synergistically to induce alternative path development in potatoes.

1 This work was supported by United States Public Health Service Grant 5-R01-GM19807 and by Energy Research and Development Administration Contract EY-76-S-03-0034.




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[Abstract] [Full Text] [PDF]


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