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Changes in free proline content (μg/g FW), soluble sugar, and soluble protein contents (mg/g FW) in the apple calli inoculated with PDA (control), LXS080601, LXS081501, and LXS081501 + LXS080601. Data represent the mean of “Fuji” and “Gala” cultivars in two independent experiments. Error bars represent standard error of the mean. Different letters on the bar show statistical significance (P < 0.05) in the osmotic adjustment substance contents at the indicated time point.
