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OR improves the enzymatic activity of P5CS. Total protein extract was prepared from the wild-type seedlings under normal growth conditions (control) or drought treatment. Different amounts of heterologously expressed and purified OR protein, with a His-tag (OR-His), was supplemented to the extract for P5CS enzymatic assay. Data are means ± SEM (n = 3, * p < 0.05, ** p < 0.01, or better, Student’s t test).
