Abstract
The temperature dependence of the metabolic rates of cultured tomato cells (Lycopersicon esculentum Mill.) has been studied by differential scanning calorimetry as a continuous function over the range from near 0 to above 45°C. Metabolic rates increase exponentially with temperature over the permissive range for growth (approx. 10–30°C). Outside this range irreversible loss of metabolic activity occurs. The rate of activity loss is time and temperature dependent, increasing as the exposure temperature diverges from the permissive range and increasing with time at any nonpermissive temperature. Metabolic heat rates obtained while scanning down from intermediate (25°C) to low temperature (0°C) yielded Arrhenius plots with pronounced downward curvature below about 12°C. The increase in apparent activation energy below 12°C is a function of the scan rate, showing its time dependency. This time dependency caused by inactivation confounds many estimates of apparent activation energy. Scanning up to high temperature shows that activity loss at high temperature is also time and temperature dependent. No first-order phase transitions associated with the changes in metabolism were detected at either low or high temperatures. Studies with lamellar lipid preparations added to cells show that temperature-induced transitions of lipids at levels equivalent to 4% of the lipid content of the cells were detectable. Cells with altered lipid composition showed altered temperature dependence of inactivation. High pressures (in the range from 10 to 14 MPa) shift the high temperature threshold and the rate of metabolic activity loss, supporting a postulate that higher-order transitions may be associated with inactivation of metabolism. Higher-order transitions of lipids or first-order transitions encompassing only a small fraction of total lipid remain among several viable postulates to explain temperature-dependent loss in activity. Alternative postulates are discussed.
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Abbreviations
- BASF 13-338:
-
[4-chloro-5(dimethylamino)-2-phenyl-3 (2H)-pyridazinone]
- DEPC:
-
Dielaidoyl phosphatidyl-choline
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This manuscript is dedicated to the memory of John Raison, a good friend and an inspiring plant physiologist. The authors thank Anne Bahr for assistance with the data analysis. The authors thank Dr. J.B. St John for the gift of BASF 13-338.
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Hansen, L.D., Afzal, M., Breidenbach, R.W. et al. High- and low-temperature limits to growth of tomato cells. Planta 195, 1–9 (1994). https://doi.org/10.1007/BF00206284
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DOI: https://doi.org/10.1007/BF00206284