TY - JOUR
AU - Ferrier, Jack M.
AB - Abstract The steady state solutions of two mathematical models are used to evaluate Münch's pressure-flow hypothesis of phloem translocation. The models assume a continuous active loading and unloading of translocate but differ in the site of loading and unloading and the route of water to the sieve tube. The dimensions of the translocation system taken are the average observed values for sugar beet and are intended to simulate translocation from a mature source leaf to an expanding sink leaf. The volume flow rate of solution along the sieve tube, water flow rate into the sieve tube, hydrostatic pressure, and concentration of sucrose in the sieve tube are obtained from a numerical computer solution of the models. The mass transfer rate, velocity of translocation, and osmotic and hydrostatic pressures are consistent with empirical findings. Owing to the resistance to water flow offered by the lateral membranes, the hydrostatic pressure generated by the osmotic pressure can be considerably less than would be predicted by the solute concentration. These models suggest that translocation at observed rates and velocities can be driven by a water potential difference between the sieve tube and surrounding tissue and are consistent with the pressure-flow hypothesis of translocation. 3 Present address: Department of Botany, University of Georgia, Athens, Ga. 30601. 4 Present address: Department of Physics, Ohio State University, Columbus, O. 43210. 1 A portion of this work was conducted at the Department of Botany, University of Georgia, Athens, Ga. 2 Paper 837 from the Department of Botany, Ohio State University, Columbus, O. This content is only available as a PDF. © 1973 American Society of Plant Biologists This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
TI - A Mathematical Treatment of Munch's Pressure-Flow Hypothesis of Phloem Translocation   
JF - Plant Physiology
DO - 10.1104/pp.52.6.531
DA - 1973-12-01
UR - https://www.deepdyve.com/lp/oxford-university-press/a-mathematical-treatment-of-munch-s-pressure-flow-hypothesis-of-phloem-8NC0fE4ki0
SP - 531
EP - 538
VL - 52
IS - 6
DP - DeepDyve
ER -