Modeling plant water uptake : from cross sections to root architecture
(2024) IJPB Symposium 2024 - Plant modeling: opportunities and challenges — Location: INRAE Ile-de-France - Versailles-Saclay (13.May.2024)
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- Authors
Schoppach, Rémy 
Heymans, Adrien
- Abstract
- The efficiency of water uptake by plants is closely tied to their root system architectures and the anatomical features of individual root segments. Local root anatomies strongly influence the capacity of a root segment to transport water from the soil into the xylem vessels (radial conductivity), and along the xylem vessels network (axial conductance). Structural factors that influence local radial and axial root hydraulic properties have been extensively studied in monocots, especially maize, but not for dicots, where important anatomical differences could represent significant consequences in hydraulic dynamics. Namely, monocot and dicot root can differ in terms of developmental anatomy, the presence of secondary growth in woody dicots, and types and timings of apoplastic barriers. These differences highlight the need to improve our knowledge on how secondary growth combined to specific deposition levels and developmental anatomy define and influence radial and axial hydraulic properties at the cross-section scale. In this work, we update and use structural and functional modelsto study the influence of anatomy (including secondary growth), hydrophobic depositions levels (suberin and/or lignin in endo- and/or exodermis) and subcellular hydraulic properties (aquaporins contribution) on local root hydraulic properties. We also investigate the consequences of such properties on root system hydraulic architectures. We use tomato (Solanum lycoperiscum L., var. Moneymaker) as a model of secondary growth dicotyledon. We explicitly show that: 1. Exodermal apoplatic barriers (lignin cap and suberization) are powerfull at reducing radial conductivity, but in a lesser extent than endodermal barriers. 2. The influence of aquaporin contribution on radial conductivity is reduced in suberized parts of roots, as shown in previous litterature. 3. Secondary growth compensates the effect of hydrophobic barriers and prevents the radial conductance to collapse, allowing for highly suberized roots to still contribute to radial water uptake. 4. Secondary growth and dicot developmental anatomy are required to increase and maintain high axial conductance, to sustain water uptake along the whole soil profile.
- Affiliations
Citations
D’Agostino, M. (2024). Modeling plant water uptake : from cross sections to root architecture. IJPB Symposium 2024 - Plant modeling: opportunities and challenges, INRAE Ile-de-France - Versailles-Saclay. https://hdl.handle.net/2078.5/240527