Abstract:

The effect of temperature on the respiration rate of potato tuber slices has been analyzed in terms of the Arrhenius equation. Freshly cut disks, irrespective of thickness, show a linear response to increasing temperature up to 30 degrees with an activation energy (E) of approximately 12.0 Kcal. Aged disks less than 1.0 mm thick also give a linear response with E similar to that of fresh disks. With aged disks above 1.0 mm thick there is a loss of linearity above 20 degrees and E falls to about 4.0 Kcal indicating that respiration becomes rate-limited by a diffusion process. This departure from linearity can be corrected by raising the oxygen tension or by subdivision of thick disks to give thin slices. It is concluded that the respiration of aged disks is rate-limited by oxygen deficiency and that the inverse relationship between respiration rate and disk thickness is in large part attributable to this factor.

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Oxygen Tension a Determining Factor in the Respiration of Potato Disks of Varying Thickness

I Macdonald

Abstract

The effect of temperature on the respiration rate of potato tuber slices has been analyzed in terms of the Arrhenius equation. Freshly cut disks, irrespective of thickness, show a linear response to increasing temperature up to 30° with an activation energy (E) of approximately 12.0 Kcal. Aged disks less than 1.0 mm thick also give a linear response with E similar to that of fresh disks. With aged disks above 1.0 mm thick there is a loss of linearity above 20° and E falls to about 4.0 Kcal indicating that respiration becomes rate-limited by a diffusion process. This departure from linearity can be corrected by raising the oxygen tension or by subdivision of thick disks to give thin slices. It is concluded that the respiration of aged disks is rate-limited by oxygen deficiency and that the inverse relationship between respiration rate and disk thickness is in large part attributable to this factor.

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BACON JS, MACDONALD IR, KNIGHT AH. THE DEVELOPMENT OF INVERTASE ACTIVITY IN SLICES OF THE ROOT OF BETA VULGARIS L. WASHED UNDER ASEPTIC CONDITIONS. Biochem J. 1965 Jan;94:175–182.[PMC free article] [PubMed] [Google Scholar]
CLICK RE, HACKETT DP. THE ROLE OF PROTEIN AND NUCLEIC ACID SYNTHESIS IN THE DEVELOPMENT OF RESPIRATION IN POTATO TUBER SLICES. Proc Natl Acad Sci U S A. 1963 Aug;50:243–250.[PMC free article] [PubMed] [Google Scholar]

Department of Plant Physiology, Mecaulay Institute for Soil Research, Aberdeen, Scotland

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Abstract

The effect of temperature on the respiration rate of potato tuber slices has been analyzed in terms of the Arrhenius equation. Freshly cut disks, irrespective of thickness, show a linear response to increasing temperature up to 30° with an activation energy (E) of approximately 12.0 Kcal. Aged disks less than 1.0 mm thick also give a linear response with E similar to that of fresh disks. With aged disks above 1.0 mm thick there is a loss of linearity above 20° and E falls to about 4.0 Kcal indicating that respiration becomes rate-limited by a diffusion process. This departure from linearity can be corrected by raising the oxygen tension or by subdivision of thick disks to give thin slices. It is concluded that the respiration of aged disks is rate-limited by oxygen deficiency and that the inverse relationship between respiration rate and disk thickness is in large part attributable to this factor.

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