The effect of root hairs on root water uptake is determined by root-soil contact and root hair shrinkage.

Autor: Duddek P; Department of Environmental Systems Science, Physics of Soils and Terrestrial Ecosystems, Institute of Terrestrial Ecosystems, ETH Zürich, Universitätsstrasse 16, 8092, Zurich, Switzerland., Ahmed MA; Root-Soil Interactions, School of Life Sciences, Technical University of Munich, D-85354, Freising, Germany., Javaux M; Agrosphere Institute, IBG-3, Forschungszentrum Jülich GmbH, 52425, Jülich, Germany., Vanderborght J; Agrosphere Institute, IBG-3, Forschungszentrum Jülich GmbH, 52425, Jülich, Germany., Lovric G; Swiss Light Source, Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen, Switzerland., King A; Synchrotron SOLEIL, L'Orme des Merisiers, 91192, Gif-sur-Yvette Cedex, France., Carminati A; Department of Environmental Systems Science, Physics of Soils and Terrestrial Ecosystems, Institute of Terrestrial Ecosystems, ETH Zürich, Universitätsstrasse 16, 8092, Zurich, Switzerland.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2023 Dec; Vol. 240 (6), pp. 2484-2497. Date of Electronic Publication: 2023 Jul 31.
DOI: 10.1111/nph.19144
Abstrakt: The effect of root hairs on water uptake remains controversial. In particular, the key root hair and soil parameters that determine their importance have been elusive. We grew maize plants (Zea mays) in microcosms and scanned them using synchrotron-based X-ray computed microtomography. By means of image-based modelling, we investigated the parameters determining the effectiveness of root hairs in root water uptake. We explicitly accounted for rhizosphere features (e.g. root-soil contact and pore structure) and took root hair shrinkage of dehydrated root hairs into consideration. Our model suggests that > 85% of the variance in root water uptake is explained by the hair-induced increase in root-soil contact. In dry soil conditions, root hair shrinkage reduces the impact of hairs substantially. We conclude that the effectiveness of root hairs on root water uptake is determined by the hair-induced increase in root-soil contact and root hair shrinkage. Although the latter clearly reduces the effect of hairs on water uptake, our model still indicated facilitation of water uptake by root hairs at soil matric potentials from -1 to -0.1 MPa. Our findings provide new avenues towards a mechanistic understanding of the role of root hairs on water uptake.
(© 2023 The Authors New Phytologist © 2023 New Phytologist Foundation.)
Databáze: MEDLINE
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