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Effect of 4°C cold treatment for up to 4 days on amylase activity and reducing sugar levels in B3‐Q plants. (a) Amylase activity in leaf extracts assayed at 25℃ in 50 mM MES buffer, pH 6, using 40 mg/ml soluble starch. (b) Reducing sugar levels in the same extracts used in a. Values are means ± SD (n = 3). Means that were significantly different from the controls of that time point are labeled with **p < .01
