Root growth and presence of Rhizophagus irregularis distinctly alter substrate hydraulic properties in a model system wi
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Root growth and presence of Rhizophagus irregularis distinctly alter substrate hydraulic properties in a model system with Medicago truncatula Richard Pauwels & Jan Jansa & David Püschel Jan Graefe & Steffen Kolb & Michael Bitterlich
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Anja Müller
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Received: 29 June 2020 / Accepted: 16 September 2020 # The Author(s) 2020
Abstract Aim We investigated how substrate hydraulic properties respond to the presence of arbuscular mycorrhizal fungi (AMF) in root-containing and root-free substrate zones in a Medicago truncatula-Rhizophagus irregularis model system. Methods Before planting, two compartments constructed from standard soil sampling cores (250 cm3) were implanted into non-mycorrhizal and mycorrhizal pots containing a sand-zeolite-soil mix. One compartment allowed root penetration (1 mm mesh cover) and the other only hyphal ingrowth (42 μm mesh cover). After eight weeks of growth under maintenance of moist conditions, the cores were subjected to water retention measurements. Additionally, we measured water retention of bare substrates before and after drying events to check for successful maintenance of moist conditions in pots. Results Drying of bare substrates decreased water retention, but planting at least sustained it. The parameters
of water retention models responded linearly to root morphological traits across mycorrhizal and nonmycorrhizal substrates. Hyphae-only colonization comparatively affected the course of water retention in ways that suggest increased pore space heterogeneity while maintaining water storage capacity of substrates. Conclusions Hence, water contents corresponded to different substrate matric potentials in non-mycorrhizal and mycorrhizal pots. We conclude that changes to water retention in AMF colonized substrates can contribute to a widely observed phenomenon, i.e. that mycorrhizal plants differ in their moisture stress response from non-mycorrhizal plants.
Keywords Arbuscular mycorrhiza . Medicago truncatula . Soil hydraulic properties . Water relations . Water retention . Root-free compartments . Roots . Hyphae
Respnsible Editor: Janusz J. Zwiazek. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04723-w) contains supplementary material, which is available to authorized users. R. Pauwels : A. Müller : J. Graefe : M. Bitterlich (*) Leibniz Institute of Vegetable and Ornamental Crops e.V. (IGZ), Grossbeeren, Germany e-mail: [email protected] J. Jansa Laboratory of Fungal Biology, Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic
D. Püschel Department of Mycorrhizal Symbioses, Institute of Botany of the Czech Academy of Sciences, Průhonice, Czech Republic S. Kolb Microbial Biogeochemistry, RA Landscape Functioning, Leibniz Center for Agricultural Landscape Research e.V. (ZALF), Müncheberg, Germany
Plant Soil
Introduction Research on arbuscular mycorrhizal symbioses repeatedly reported that non-mycorrhizal plants and plants colonized by arbuscular mycorrhizal fungi (
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