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Suc content of the guard cell symplast (░⃞) and the guard cell apoplast (□) at 60% RH (left column in each pair) and at 90% RH (right column in each pair) at 1100 h. n = 88–224 guard cell pairs (11–28 plants) for each column. P values (t test) are for the paired columns; other details are as in Figure 1.
