Abstract
Free fatty acids accumulate in plant membranes after exposure of plants to environmental stress, such as freezing and desiccation. Fatty acid accumulation has been linked to various biophysical changes and to the occurrence of lipid peroxidation, but the relationships appear complex and inconsistent. The interactions between oxygen free radicals, free fatty acids and lipid peroxidation in plant membranes were examined further by studying peroxidation reactions in a model membrane system composed of a complex mixture of plant phospholipids, including various free fatty acids. Multilamellar liposomes were treated with oxygen free radicals generated from iron ascorbate. Increased concentrations of free palmitic acid up to 10 mol% (fatty acid/phospholipid) reduced the production of aldehydes detected by the thiobarbituric acid assay, but enhanced the production of fluorescent products. By contrast, increased concentrations of free linolenic acid increased aldehyde production and reduced the formation of fluorescent products. The two free fatty acids both enhanced the susceptibility of phospholipids to degradation as shown by the reduced recovery of esterified polyunsaturated fatty acids (linoleic and linolenic). The free radical reactions with or without free fatty acid additions catalyzed the selective degradation of phospholipids in the order phosphatidylethanolamine > phosphatidylcholine > phosphatidylinositol > phosphatidylglycerol. Selective degradation of phospholipids is often observed after periods of environmental stress or during senescence of plants, and has been cited as evidence for the involvement of phospholipases in these degenerative processes. The results indicate that selectivity is not a criterion for eliminating the involvement of oxygen free radicals in these degenerative processes. Furthermore, the results suggest that modifications of lipid composition during a plant's acclimation to adverse environments may determine the types of free radical reactions that occur due to stress.
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Abbreviations
- BHT:
-
butylated hydroxytoluene
- EDTA:
-
ethylenediaminetetraacetic acid
- MDA:
-
malondialdehyde
- PA:
-
phosphatidic acid
- PC:
-
phosphatidylcholine
- PE:
-
phosphatidylethanolamine
- PG:
-
phosphatidylglycerol
- PI:
-
phosphatidylinositol
- PUFA:
-
polyunsaturated fatty acids
- TBA:
-
thiobarbituric acid
- TBARS:
-
thiobarbituric acid reactive substances
References
Kendall, E.J., McKersie, B.D., and Stinson, R.H. (1985)Can. J. Bot. 63, 2274–2277.
Kendall, E.J., and McKersie, B.D. (1989)Physiol. Plant. 76, 86–94.
Senaratna, T., McKersie, B.D., and Stinson, R.H. (1984)Plant Physiol. 76, 759–762.
Wise, R.R., and Naylor, A.W. (1987)Plant Physiol. 83, 272–277.
Thompson, J.E. (1988) inSenescence and Aging in Plants (Nooden, L.D., and Leopold, A.C., eds.) pp. 52–83, Academic Press, San Diego.
Van Bilsen, D.G.J.L., and Hoekstra, F.A. (1993)Plant Physiol. 101, 675–682.
Pryor, W.A. (1976) inFree Radicals in Biology (Pryor, W.A., ed.) Vol. 1, pp. 1–49, Academic Press, New York.
Senaratna, T., McKersie, B.D., and Stinson, R.H. (1985)Plant Physiol. 77, 472–474.
McKersie, B.D., Hoekstra, F.A., and Krieg, L.C. (1990)Biochim. Biophys. Acta 1030, 119–126.
Senaratna, T., and McKersie, B.D. (1986) inMembranes, Metabolism and Dry Organisms (Leopold, A.C., ed.) pp. 85–101, Comstock Publishing, Ithaca.
Yoshida, S., and Sakai, A. (1974)Plant Physiol. 53, 509–511.
Brown, J.H., Chambers, J.A., and Thompson, J.E. (1991)Plant Physiol. 95, 909–916.
Brown, J.H., Chambers, J.A., and Thompson, J.E. (1991)Phytochem. 30, 2537–2543.
Senaratna, T., McKersie, B.D., and Borochov, A. (1987)J. Exptl. Bot. 38, 2005–2014.
Comporti, M. (1989)Chem. Biol. Interactions 72, 1–56.
Creutz, C.E. (1981)J. Cell Biol. 91, 247–256.
Lucy, J.A. (1984) inMolecular Processes. Molecular Biology and Medical Applications (Benga, G., Baun, H., and Kummerow, F.A., eds.) pp. 18–48, Springer Verlag, New York.
Meers, P., Hong, K., and Papahadjopoulos, D. (1988)Biochemistry 27, 6784–6794.
Crowe, J.H., Carpenter, J.F., Crowe, L.M., and Anchordoguy, T.J. (1990)Cryobiol. 27, 219–231.
Hoekstra, F.A., Crowe, J.H., and Crowe, L.M. (1991)Plant Physiol. 97, 1073–1079.
Crowe, J.H., McKersie, B.D., and Crowe, L.M. (1989)Biochim. Biophys. Acta 979, 7–10.
Kosugi, H., Kajima, T., and Kikugawa, K. (1989)Lipids 24, 873–881.
Tappel, A.L. (1975) inPathobiology of Cell Membranes (Trump, B.F., and Arstila, A., eds.) Vol. 1, pp. 145–170, Academic Press, New York.
Steponkus, P.L. (1984)Ann. Rev. Plant Physiol. 35, 543–584.
Bridger, G., Yang, W., Falk, D.E., and McKersie, B.D. (1994)J. Plant Physiol. 144, 235–240.
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Barclay, K.D., McKersie, B.D. Peroxidation reactions in plant membranes: Effects of free fatty acids. Lipids 29, 877–882 (1994). https://doi.org/10.1007/BF02536256
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DOI: https://doi.org/10.1007/BF02536256