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Xylem ABA concentration of sap collected from detached leaves (a) and the stub of the same petiole via root pressurisation (b) plotted against root xylem ABA concentration for AC (circles), RR (filled circles), not (triangles), flc (inverted triangles) and sit (filled diamonds) tomato plants. Each point is a separate xylem sap sample, with the solid line representing the 1:1 relationship, and the dotted line indicating the regression between the points.
