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Variable hydraulic resistances and their impact on plant drought response modelling.

Identifieur interne : 000008 ( PubMed/Corpus ); précédent : 000007; suivant : 000009

Variable hydraulic resistances and their impact on plant drought response modelling.

Auteurs : Annelies Baert ; Veerle De Schepper ; Kathy Steppe

Source :

Tree physiology [ 1758-4469 ] ; 2015.

RBID : pubmed:25273815

English descriptors

KwdEn :
- Adaptation, Physiological, Droughts, Models, Biological, Plant Stems (physiology), Plant Transpiration, Quercus (physiology), Soil, Stress, Physiological, Vitis (physiology), Water (physiology), Xylem (physiology).
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

Links to Exploration step

pubmed:25273815

Le document en format XML

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<author><name sortKey="Baert, Annelies" sort="Baert, Annelies" uniqKey="Baert A" first="Annelies" last="Baert">Annelies Baert</name>
<affiliation><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>
</affiliation>
</author>
<author><name sortKey="De Schepper, Veerle" sort="De Schepper, Veerle" uniqKey="De Schepper V" first="Veerle" last="De Schepper">Veerle De Schepper</name>
<affiliation><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>
</affiliation>
</author>
<author><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name>
<affiliation><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 Kathy.Steppe@UGent.be.</nlm:affiliation>
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<author><name sortKey="Baert, Annelies" sort="Baert, Annelies" uniqKey="Baert A" first="Annelies" last="Baert">Annelies Baert</name>
<affiliation><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>
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<author><name sortKey="De Schepper, Veerle" sort="De Schepper, Veerle" uniqKey="De Schepper V" first="Veerle" last="De Schepper">Veerle De Schepper</name>
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<series><title level="j">Tree physiology</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adaptation, Physiological</term>
<term>Droughts</term>
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<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>
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<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>
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<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>
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<Day>30</Day>
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<Abstract><AbstractText>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.</AbstractText>
<CopyrightInformation>© The Author 2014. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.</CopyrightInformation>
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<AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Baert</LastName>
<ForeName>Annelies</ForeName>
<Initials>A</Initials>
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<Author ValidYN="Y"><LastName>Steppe</LastName>
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<AffiliationInfo><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 Kathy.Steppe@UGent.be.</Affiliation>
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<KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">drought-induced hydraulic failure</Keyword>
<Keyword MajorTopicYN="N">grapevine</Keyword>
<Keyword MajorTopicYN="N">hydraulic conductance</Keyword>
<Keyword MajorTopicYN="N">oak</Keyword>
<Keyword MajorTopicYN="N">point dendrometers</Keyword>
<Keyword MajorTopicYN="N">sap flow</Keyword>
<Keyword MajorTopicYN="N">soil conductance</Keyword>
<Keyword MajorTopicYN="N">stem diameter variations</Keyword>
<Keyword MajorTopicYN="N">stem water potential</Keyword>
<Keyword MajorTopicYN="N">water deficit</Keyword>
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Variable hydraulic resistances and their impact on plant drought response modelling.

Variable hydraulic resistances and their impact on plant drought response modelling.

Source :

English descriptors

Abstract

Links to Exploration step

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