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The relationship between detached leaf xylem ABA concentration (a) or xylem ABA concentration above the graft union (b) and mean root xylem ABA concentration (open circles) and a model where [X-ABA]leaf (a) or [X-ABA]above the graft union (b)=Fdry[X-ABA]dry+Fwet[X-ABA]wet (closed circles) for ‘two root-one shoot’ PRD plants grown in two separate pots (a) or two plastic bags in a single pot (b). In both cases the 1:1 relationship is shown as a solid line.
