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Changes in activity of cell wall enzymes upon cold treatment. Plants of three maize inbred lines were grown at 24 °C/22 °C (control, day 0) and transferred to 14 °C/12 °C for seven days. Crude cell wall was prepared from 3rd leaves at time points indicated and enzyme activities were measured as described in Materials and Methods. a Pectin methylesterase activity (PME); b. Peroxidase activity (POX). Data are means ± SD for three independent experiments with three plants per experiment
