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Effects of water and temperature treatments (+s.e.) on stomatal density (number of stomata per 2·2-cm length of leaf). D, Decreased; C, control; I, increased; W, water; T, temperature. n = 314. Bars sharing the same letters are not significantly different (P > 0·10) using Tukey's test. The arrow below the x-axis shows the directional increase in climate stress.
