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Experimental study demonstrates elevated peroxidase and superoxide dismutase activities during cold acclimation in Arabidopsis, highlighting peroxidase-mediated protection against hypothermia.
Changes in activities of the enzymes performing direct antioxidant functions were studied in 7–8-week-old plants Arabidopsis thaliana Heinh (L.) of Columbia (Col-0) ecotype. It was found that 5-day cold hardening at 2°C increased plant cold resistance to the subsequent stronger cooling. Under these conditions, the marked changes occurred in activities of superoxide dismutase and III type (guaiacol) peroxidses but not in that of catalase. The total peroxidase activity exceeded the catalase activity before cold hardening. Therefore, peroxidases are able to decompose more H 2 O 2 than catalases and appear to make the dominant contribution to the protection from the cold damage.
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Синькевич et al. (2016) studied this question.
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