Figure 6.

Measured concentration of D₂O (dots) and the best fit of the simplified model (solid lines) for roots partly immersed in D₂O. The simulated concentrations refer to the root in Figure 5. Root length and location of D₂O injection are illustrated in Figure 7A. A, Average D₂O concentration in the root segment immersed in D₂O with the best fit of the model. B, Average D₂O concentration in the root segment beyond the capillary barrier with the best fit of the model. C, Average D₂O concentration across the root as a function of distance to the root tip at different time steps after D₂O injection. Each line refers to a different time step after D₂O injection.