Changes in the levels of superoxide anion radical and total peroxides were studied immediately after the chilling of 7–11-day-old seedlings of maize (Zea mays L.), cucumber (Cucumis sativus L.), millet (Panicum miliaceum L.), and etiolated potato (Solanum tuberosum L.) shoots at 2°C for 1–24 h and one day after 24-h chilling. A short-term (1 h) chilling of chilling-sensitive plants resulted in the 2.4–7.5-fold acceleration of the O– 2 generation. A longer chilling period reduced somewhat the rate of O– 2 generation, but this rate did not achieve the control level. The highest level of H2O2 was observed after 2-h chilling with its subsequent lowering. In the cold-tolerant potato, the levels of O– 2 and peroxides reduced after chilling. The rate of lipid peroxidation (an index characterizing cold-induced membrane damage) increased gradually with the lengthening of the chilling period. Reactive oxygen species are supposed to be involved in the induction of the oxidative stress during chilling of chilling-sensitive plants and in the triggering of cold-induced damage.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 13, 2004
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