Journal Article

FZJ-2014-00287

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Hydrodynamics of steady state phloem transport with radial leakage of solute

Cabrita, P. ; Thorpe, M.FZJ* ; Huber, G. (Corresponding author)FZJ*

2013
Frontiers Media Lausanne

This record in other databases:      

Please use a persistent id in citations: http://hdl.handle.net/2128/16204  doi:10.3389/fpls.2013.00531

Abstract: 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.

Note: erscheint nur online, Herr Cabrita war IBG-2 Mitarbeiter

---

Contributing Institute(s):

1. Pflanzenwissenschaften (IBG-2)

Research Program(s):

1. 242 - Sustainable Bioproduction (POF2-242) (POF2-242)

Appears in the scientific report 2013

---

Database coverage:
; ; ; ; BIOSIS Previews ; Current Contents - Agriculture, Biology and Environmental Sciences ; DOAJ Seal ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---