TY  - JOUR
AU  - Cabrita, Paulo
AU  - Thorpe, Michael
AU  - Huber, Gregor
TI  - Hydrodynamics of steady state phloem transport with radial leakage of solute
JO  - Frontiers in plant science
VL  - 4
IS  - 531
SN  - 1664-462X
CY  - Lausanne
PB  - Frontiers Media
M1  - FZJ-2014-00287
SP  - 1-16
PY  - 2013
N1  - erscheint nur online, Herr Cabrita war IBG-2 Mitarbeiter
AB  - Long-distance phloem transport occurs under a pressure gradient generated by the osmotic exchange of water associated with solute exchange in source and sink regions. But these exchanges also occur along the pathway, and yet their physiological role has almost been ignored in mathematical models of phloem transport. Here we present a steady state model for transport phloem which allows solute leakage, based on the Navier-Stokes and convection-diffusion equations which describe fluid motion rigorously. Sieve tube membrane permeability Ps for passive solute exchange (and correspondingly, membrane reflection coefficient) influenced model results strongly, and had to lie in the bottom range of the values reported for plant cells for the results to be realistic. This smaller permeability reflects the efficient specialization of sieve tube elements, minimizing any diffusive solute loss favored by the large concentration difference across the sieve tube membrane. We also found there can be a specific reflection coefficient for which pressure profiles and sap velocities can both be similar to those predicted by the Hagen-Poiseuille equation for a completely impermeable tube.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000331533400002
C6  - pmid:24409189
DO  - DOI:10.3389/fpls.2013.00531
UR  - https://juser.fz-juelich.de/record/150211
ER  -