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Changes in: (A) Free proline content (PRO; µmol PRO g-1 DW); (B) Glycine betaine (GB; mg GB g -1 DW). Treatments: C: control (0 g/L PEG 6000); PEG50 (50 g/L PEG 6000). Differences between values of the same trait that are labeled with the same letter are not statistically significant (p>0.05). Error bars represent standard error (± SE).
