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Mobilization of Respiratory Metabolism in Potato Tubers by Carbon Dioxide ¹

Harry W. Janes and Chaim Frenkel³

Department of Food Science, Rutgers University, New Brunswick, New Jersey 08903, Department of Horticulture and Forestry, Rutgers University, New Brunswick, New Jersey 08903

Applying high concentrations of CO₂ to whole potato tubers stimulated a rapid and pronounced respiratory gas exchange, which persisted for a prolonged time. The upsurge in respiration was proportional to the applied CO₂ concentrations and was further augmented by high O₂ levels. Tests using whole potatoes, or potato tissue slices from tubers previously treated with CO₂, indicated that the rapid CO₂-induced respiration is sensitive to cyanide during the first 24 hours of CO₂ application. The respiratory rise cannot be attributed to the emergence of a cyanide-resistant alternative electron transport pathway, although prolonged applications of CO₂, up to 72 hours, led to a gradual development of the pathway. CO₂-stimulated respiration was accompanied by a pronounced decline in the content of starch and glucose 6-phosphate, suggesting an active utilization of respiratory substrates. The ATP content in the CO₂-treated potatoes increased markedly, resembling similar increases in tissues undergoing respiratory upsurge.

³ To whom reprint requests should be addressed.

¹ This work was performed as part of New Jersey Agricultural Experiment Station Projects 12240 and 12144 (supported by the New Jersey Agricultural Experiment Station) and is a paper of the Journal Series, New Jersey Agricultural Experiment Station, Cook College, Rutgers—The State University of New Jersey, New Brunswick, NJ 08903.

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