Fig. 5.
Heat maps of driving components and radial water flux throughout the RSA of a CTR root (A–C), and a PEG root (D–F) bathing in a CTR or PEG solution, respectively. In both cases, a hydrostatic overpressure of 0.1 MPa was applied to the external medium. ΔP=Pe–P is the difference between the hydrostatic pressure of the external medium, Pe, and the xylem vessel pressure P, in MPa (A and D). ΔC=C–Ce is the difference between solute concentration in the xylem vessels, C, and the external concentration, Ce, in mol m–3 (B and E). j is the local radial flow of water in µl s–1 m–2 (D and F). Scale bar=10 mm.