Effects of Ca2+ ions on the intensity of lipid peroxidation, activities of guaiacol peroxidase, superoxide dismutase (SOD), and catalase, as well as on heat resistance of winter wheat (Triticum aestivium L.) coleoptiles were examined. A preliminary incubation of coleoptile segments in a 5 mM CaCl2 solution was shown to improve their survival rates after an injuring heat treatment (43.5°C). The effect of Ca2+ was suppressed by the inhibitor of Ca2+ channels (1 mM LaCl3). An incubation of coleoptiles in the presence of 5 mM CaCl2 prior to the stress treatment elevated the content of lipid peroxidation product, malondialdehyde (MDA) and stimulated the activities of guaiacol peroxidase, SOD, and catalase. After the heat exposure of untreated and Ca2+-treated seedlings, differential changes in MDA content and in activities of guaiacol peroxidase, SOD, and catalase were observed. It is concluded that a short-term oxidative stress arising in Ca2+-enriched plant tissues after the heat treatment is unrelated to their irreversible damage.
Russian Journal of Plant Physiology – Springer Journals
Published: Apr 7, 2005
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