Abstract
This review aims to summarise the many facets of how water flow in higher plants affects nutrient transport and vice versa. Initially, some theoretical background is given on physico-chemical concepts to describe fluxes and their (in)direct coupling, followed by a brief overview on some of the relevant methods (pressure probes, ZIM probe, MIFE technique, radioactive and stable isotopes, MRT flow imaging, heat balance technique, modelling of nutrient fluxes). This essay focusses on roots, on vascular tissues and on the whole-plant level, with only occasional in-depth reference to the molecular scale. Radial water and nutrient transport in roots are discussed in analogy to processes in mammalian epithelia, including a possible role of salt/water cotransporters for generating the “non-osmotic” component of root pressure. Moreover, the significance of low reflection coefficients for the coupling of water and solute transport in roots is critically addressed. Separate sections deal with interactions of water and nutrient transport in vascular tissue (xylem, phloem). Finally, a whole-plant perspective is taken; the significance of transpiration for plant nutrition in general, and for the nutrients N, Ca and K in particular, is discussed.
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Acknowledgements
I would like to thank Prof U. Zimmermann, Henningsdorf, for many stimulating discussions and for critical reading of the manuscript. Thanks are also due to Prof. Zimmermann and S. Rüger for providing diagrams showing the ZIM probe and a hitherto unpublished model experiment.
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Wegner, L.H. (2015). Interplay of Water and Nutrient Transport: A Whole-Plant Perspective. In: Lüttge, U., Beyschlag, W. (eds) Progress in Botany. Progress in Botany, vol 76. Springer, Cham. https://doi.org/10.1007/978-3-319-08807-5_5
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