Abstract
Mitochondria isolated from spinach leaves (Spinacia oleracea L.) and potato tubers (Solanum tuberosum L.) were partly injured when subjected to freezing for 2 to 4 h at-25°C in salt solutions in the absence of cryoprotectants. Damage was manifested by the inactivation of respiratory properties and increase in the permeability of the mitochondrial membranes. Decrease in respiratory control indicated that the control mechanism of the electron transport chain was influenced by freezing. Oxidative phosphorylation was only slightly more affected than electron transport. The inactivation of the membrane systems was caused by an increase in the concentration of membrane-toxic solutes. This was confirmed by treatment of the organelles at 0°C in solutions of high salt concentrations. When sugar was present in the course of freezing, mitochondria were partly or completely protected. On a molar basis, sucrose was more effective in membrane protection than glucose. Under certain conditions amino acids, e.g., proline and hydroxyproline, also stabilized isolated mitochondria during freezing.
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Abbreviations
- BSA:
-
bovine albumin
- HEPES:
-
N-2-hydroxyethylpiperazine-N′-2-ethane sulfonic acid
- MOPS:
-
2-N-morpholinopropane sulfonic acid
- PVP:
-
polyvinyl pyrrolidone
- RC:
-
respiratory control
- Tris:
-
tris (hydroxymethyl) aminomethane
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Thebud, R., Santarius, K.A. Effects of freezing on isolated plant mitochondria. Planta 152, 242–247 (1981). https://doi.org/10.1007/BF00385151
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DOI: https://doi.org/10.1007/BF00385151