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Growth responses of primary roots to the water potential of agar blocks applied to the root surface at various positions along the root axis. Elongation rates were averaged for the first 3 h after the start of treatment. Closed and open circles represent −0.03- and −1.60-MPa agar blocks, respectively. Bars represent sds (n = 4–15). Letters (a, b, and c) indicate statistically significant differences between treatments (Tukey-Kramer test; P = 0.01).
