Figure 8.
Effects of Ra (horizontal axes) and Pm (vertical axes) on the percentage of outside-xylem hydraulic resistance contributed by the BS (contours) for two sets of conditions: default values for all parameters, as given in Tables III and IV, including no blockage of apoplastic transport in the BS (A); and default values for all parameters, except that apoplastic pathways in the BS are blocked by a suberized layer or Casparian strip (B). Gray circles indicate the locations of default values for Ra and Pm (3 nm and 40 μm s−1, respectively).