%0 Journal Article
%A Tyree, Melvin T.
%A Christy, A. Lawrence
%A Ferrier, Jack M.
%T A Simpler Iterative Steady State Solution of Münch Pressure-Flow Systems Applied to Long and Short Translocation Paths
%D 1974
%R 10.1104/pp.54.4.589
%J Plant Physiology
%P 589-600
%V 54
%N 4
%X A simple steady state iterative solution of Münch pressure-flow in unbranched sieve tubes containing only water and sucrose is derived. The iterative equations can be solved on a programmable desk calculator. Solutions are presented for steady state transport with specific mass transfer rates up to 1.5 × 10−5 mole second−1 centimeters−2 (= 18.5 grams hour−1 centimeters−2) over distances in excess of 50 meters. The calculations clearly indicate that a Münch pressure-flow system can operate over long distances provided (a) the sieve tube is surrounded by a semipermeable membrane; (b) sugars are actively loaded in one region and unloaded at another; (c) the sieve pores are unblocked so that the sieve tube hydraulic conductivity is high (around 4 centimeters2 second−1 bar−1); (d) the sugar concentration is kept high (around one molar in the source region); and (e) the average sap velocity is kept low (around 20-50 centimeters hour−1). The dimensions of sieve cells in several species of plants are reviewed and sieve tube hydraulic conductivities are calculated; the values range from 0.2 to 20 centimeters2 second−1 bar−1. For long distance pressure-flow to occur, the hydraulic conductivity of the sieve cell membranes must be about 5 × 10−7 centimeters second−1 bar−1 or greater.
%U http://www.plantphysiol.org/content/plantphysiol/54/4/589.full.pdf