About the biophysical mechanisms of the long-distance water translocation in plants
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Institute of Physics, Pedagogicał University, Leśna 16,25-509 Kielce, Poland
Department of Physics and Biophysics, Agricultural University of Wrocław, Norwida 25,50-375 Wrocław, Poland
Int. Agrophys. 1995, 9(3): 243-255
The present work discusses the basie mechanisms of water translocation on the so-called long distances. The translocation includes: transfer of water and minerał components across the root (from the soil to the xylem tracheary elements); transport of water through the xylem (along the plant); permeation of water across the leaf tissue, where most of it evaporates into the atmos-phere; and the phloem transport of water and assimilates. The last type of long-distance transport of water oceurs in opposite direetion to its xylem transport. It has been shown that the long-distance transport of water is mutually connected at its various stages, and their mechanisms are numerous and operative in various parts of the plant. Es-pecially broad coverage has been given in this work to fur-ther development of the so-called graviosmotic hypothesis, according to which water might be transported along the xylem vessels by using the graviosmotic mechanisms. This presentation is concemed with that version of the hypothesis which is based on the gravidiffusive mechanism ofgraviosmosis.
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