Abstract
It has been demonstrated that root pressure exudation from excised primary roots of Zea mays is adequately described by a standing gradient osmotic flow model. The differential equations set out by Diamond & Bossart (1967) to describe isotonic water transport across animal epithelia have been modified to render them more appropriate to the excised root, and solved by an analogue programme. A good fit of the experimentally determined values of water flux, salt flux and exudate salt concentration has been obtained providing the osmotic permeability of the root is allowed to vary with distance from the root tip. The anatomical identity of the exudate channel is discussed, but no firm assignment can be made.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
