Variable hydraulic resistances and their impact on plant drought response modelling.
Identifieur interne : 000018 ( Main/Exploration ); précédent : 000017; suivant : 000019Variable hydraulic resistances and their impact on plant drought response modelling.
Auteurs : Annelies Baert [Belgique] ; Veerle De Schepper [Belgique] ; Kathy Steppe [Belgique]Source :
- Tree physiology [ 1758-4469 ] ; 2015.
English descriptors
- KwdEn :
- MESH :
- chemical , physiology : Water.
- chemical : Soil.
- physiology : Plant Stems, Quercus, Vitis, Xylem.
- Adaptation, Physiological, Droughts, Models, Biological, Plant Transpiration, Stress, Physiological.
Abstract
Plant drought responses are still not fully understood. Improved knowledge on drought responses is, however, crucial to better predict their impact on individual plant and ecosystem functioning. Mechanistic models in combination with plant measurements are promising for obtaining information on plant water status and can assist us in understanding the effect of limiting soil water availability and drought stress. While existing models are reliable under sufficient soil water availability, they generally fail under dry conditions as not all appropriate mechanisms seem yet to have been implemented. We therefore aimed at identifying mechanisms underlying plant drought responses, and in particular investigated the behaviour of hydraulic resistances encountered in the soil and xylem for grapevine (Vitis vinifera L.) and oak (Quercus robur L.). A variable hydraulic soil-to-stem resistance was necessary to describe plant drought responses. In addition, implementation of a variable soil-to-stem hydraulic resistance enabled us to generate an in situ soil-to-stem vulnerability curve, which might be an alternative to the conventionally used vulnerability curves. Furthermore, a daily recalibration of the model revealed a drought-induced increase in radial hydraulic resistance between xylem and elastic living tissues. Accurate information on plant hydraulic resistances and simulation of plant drought responses can foster important discussions regarding the functioning of plants and ecosystems during droughts.
DOI: 10.1093/treephys/tpu078
PubMed: 25273815
Affiliations:
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Le document en format XML
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Schepper</name><affiliation wicri:level="4"><nlm:affiliation>Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000 Ghent, Belgium.</nlm:affiliation><country xml:lang="fr">Belgique</country><wicri:regionArea>Laboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, B-9000 Ghent</wicri:regionArea><orgName type="university">Université de Gand</orgName><placeName><settlement type="city">Gand</settlement><region>Région flamande</region><region type="district" nuts="2">Province de Flandre-Orientale</region></placeName></affiliation></author><author><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name><affiliation wicri:level="4"><nlm:affiliation>Laboratory of Plant Ecology, Department of Applied Ecology and Environmental 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Biological</term><term>Plant Stems (physiology)</term><term>Plant Transpiration</term><term>Quercus (physiology)</term><term>Soil</term><term>Stress, Physiological</term><term>Vitis (physiology)</term><term>Water (physiology)</term><term>Xylem (physiology)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="physiology" xml:lang="en"><term>Water</term></keywords><keywords scheme="MESH" type="chemical" xml:lang="en"><term>Soil</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Plant Stems</term><term>Quercus</term><term>Vitis</term><term>Xylem</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Adaptation, Physiological</term><term>Droughts</term><term>Models, Biological</term><term>Plant Transpiration</term><term>Stress, Physiological</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Plant drought responses are still not fully understood. Improved knowledge on drought responses is, however, crucial to better predict their impact on individual plant and ecosystem functioning. Mechanistic models in combination with plant measurements are promising for obtaining information on plant water status and can assist us in understanding the effect of limiting soil water availability and drought stress. While existing models are reliable under sufficient soil water availability, they generally fail under dry conditions as not all appropriate mechanisms seem yet to have been implemented. We therefore aimed at identifying mechanisms underlying plant drought responses, and in particular investigated the behaviour of hydraulic resistances encountered in the soil and xylem for grapevine (Vitis vinifera L.) and oak (Quercus robur L.). A variable hydraulic soil-to-stem resistance was necessary to describe plant drought responses. In addition, implementation of a variable soil-to-stem hydraulic resistance enabled us to generate an in situ soil-to-stem vulnerability curve, which might be an alternative to the conventionally used vulnerability curves. Furthermore, a daily recalibration of the model revealed a drought-induced increase in radial hydraulic resistance between xylem and elastic living tissues. Accurate information on plant hydraulic resistances and simulation of plant drought responses can foster important discussions regarding the functioning of plants and ecosystems during droughts.</div></front></TEI><affiliations><list><country><li>Belgique</li></country><region><li>Province de Flandre-Orientale</li><li>Région flamande</li></region><settlement><li>Gand</li></settlement><orgName><li>Université de Gand</li></orgName></list><tree><country name="Belgique"><region name="Région flamande"><name sortKey="Baert, Annelies" sort="Baert, Annelies" uniqKey="Baert A" first="Annelies" last="Baert">Annelies Baert</name></region><name sortKey="De Schepper, Veerle" sort="De Schepper, Veerle" uniqKey="De Schepper V" first="Veerle" last="De Schepper">Veerle De Schepper</name><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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