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Embolism events in the xylem of a Q. sadleriana leaf (A) and stem (C) and a Q. berberidifolia leaf (B) and stem (D), as observed using the optical vulnerability technique. Scale bars indicate the water potential recorded at each event and are different for each image. Q. sadleriana was the least resistant to embolism, and Q. berberidifolia was the most resistant to embolism.
