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Time-course changes in stomatal aperture on cucumber leaves’ response to shungite under drought stress. (A) Stomatal aperture in detached abaxial epidermal strips under drought stress. Scale bar = 20 µm. (B) Data are represented as the mean of 15 randomly selected stomata from three biological replicates (±SD). Different letters indicate significant differences (Student’s t-test, p ≤ 0.05).
