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Labeling of Glu (upper panels) and Pro (lower panels) by 3H supplied as Pro in apical and basal sections of the root tip at high (−0.02 MPa) or low (−1.6 MPa) ψw. Sampling and data presentation are as described for Figure 5. ○, High-ψw apical section; •, high-ψw basal section; ▵, low-ψw apical section; ▴, low-ψw basal section.
