Explaining ontogenetic shifts in root–shoot scaling with transient dynamics
Identifieur interne : 001581 ( Pmc/Curation ); précédent : 001580; suivant : 001582Explaining ontogenetic shifts in root–shoot scaling with transient dynamics
Auteurs : Théophile Lohier [France] ; Franck Jabot [France] ; Driss Meziane [Maroc] ; Bill Shipley [Canada] ; Peter B. Reich [États-Unis, Australie] ; Guillaume Deffuant [France]Source :
- Annals of Botany [ 0305-7364 ] ; 2014.
Abstract
Simple models of herbaceous plant growth based on optimal partitioning theory predict, at steady state, an isometric relationship between shoot and root biomass during plant ontogeny, i.e. a constant root–shoot ratio. This prediction has received mixed empirical support, suggesting either that optimal partitioning is too coarse an assumption to model plant biomass allocation, or that additional processes need to be modelled to account for empirical findings within the optimal partitioning framework. In this study, simulations are used to compare quantitatively two potential explanations for observed non-isometric relationships, namely nutrient limitation during the experiments and initial developmental constraints.
A simple plant growth model was built to simulate the growth of herbaceous species, based on optimal partitioning theory combined with empirically measured plant functional traits. Its ability to reproduce plant relative growth rate and final root weight ratio was assessed against previously published data. Predicted root–shoot ratios during plant ontogeny were compared with experimental observations. The effects of nutrient limitation and initial developmental constraints on root–shoot ratios were then tested.
The model was found to reproduce overall plant growth patterns accurately, but failed, in its simplest form, at explaining non-isometric growth trajectories. Both nutrient limitation and ontogenetic developmental constraints were further shown to cause transient dynamics resulting in a deviation from isometry. Nitrogen limitation alone was not sufficient to explain the observed trajectories of most plant species. The inclusion of initial developmental constraints (fixed non-optimal initial root–shoot ratios) enabled the reproduction of the observed trajectories and were consistent with observed initial root–shoot ratios.
This study highlights the fact that considering transient dynamics enables theoretical predictions based on optimal partitioning to be reconciled with empirically measured ontogenetic root–shoot allometries. The transient dynamics cannot be solely explained by nutrient limitation during the experiments, pointing to a likely role for initial developmental constraints in the observed non-isometric growth trajectories.
Url:
DOI: 10.1093/aob/mcu128
PubMed: 24989785
PubMed Central: 4217652
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<front><div type="abstract" xml:lang="en"><sec><title>Background and Aims</title>
<p>Simple models of herbaceous plant growth based on optimal partitioning theory predict, at steady state, an isometric relationship between shoot and root biomass during plant ontogeny, i.e. a constant root–shoot ratio. This prediction has received mixed empirical support, suggesting either that optimal partitioning is too coarse an assumption to model plant biomass allocation, or that additional processes need to be modelled to account for empirical findings within the optimal partitioning framework. In this study, simulations are used to compare quantitatively two potential explanations for observed non-isometric relationships, namely nutrient limitation during the experiments and initial developmental constraints.</p>
</sec>
<sec><title>Methods</title>
<p>A simple plant growth model was built to simulate the growth of herbaceous species, based on optimal partitioning theory combined with empirically measured plant functional traits. Its ability to reproduce plant relative growth rate and final root weight ratio was assessed against previously published data. Predicted root–shoot ratios during plant ontogeny were compared with experimental observations. The effects of nutrient limitation and initial developmental constraints on root–shoot ratios were then tested.</p>
</sec>
<sec><title>Key Results</title>
<p>The model was found to reproduce overall plant growth patterns accurately, but failed, in its simplest form, at explaining non-isometric growth trajectories. Both nutrient limitation and ontogenetic developmental constraints were further shown to cause transient dynamics resulting in a deviation from isometry. Nitrogen limitation alone was not sufficient to explain the observed trajectories of most plant species. The inclusion of initial developmental constraints (fixed non-optimal initial root–shoot ratios) enabled the reproduction of the observed trajectories and were consistent with observed initial root–shoot ratios.</p>
</sec>
<sec><title>Conclusions</title>
<p>This study highlights the fact that considering transient dynamics enables theoretical predictions based on optimal partitioning to be reconciled with empirically measured ontogenetic root–shoot allometries. The transient dynamics cannot be solely explained by nutrient limitation during the experiments, pointing to a likely role for initial developmental constraints in the observed non-isometric growth trajectories.</p>
</sec>
</div>
</front>
</TEI>
<pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Ann Bot</journal-id>
<journal-id journal-id-type="iso-abbrev">Ann. Bot</journal-id>
<journal-id journal-id-type="publisher-id">annbot</journal-id>
<journal-id journal-id-type="hwp">annbot</journal-id>
<journal-title-group><journal-title>Annals of Botany</journal-title>
</journal-title-group>
<issn pub-type="ppub">0305-7364</issn>
<issn pub-type="epub">1095-8290</issn>
<publisher><publisher-name>Oxford University Press</publisher-name>
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<article-meta><article-id pub-id-type="pmid">24989785</article-id>
<article-id pub-id-type="pmc">4217652</article-id>
<article-id pub-id-type="doi">10.1093/aob/mcu128</article-id>
<article-id pub-id-type="publisher-id">mcu128</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Original Articles</subject>
</subj-group>
<subj-group subj-group-type="hwp-journal-coll"><subject>1007</subject>
</subj-group>
</article-categories>
<title-group><article-title>Explaining ontogenetic shifts in root–shoot scaling with transient dynamics</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Lohier</surname>
<given-names>Théophile</given-names>
</name>
<xref ref-type="aff" rid="af1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Jabot</surname>
<given-names>Franck</given-names>
</name>
<xref ref-type="aff" rid="af1">1</xref>
<xref ref-type="corresp" rid="cor1">*</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Meziane</surname>
<given-names>Driss</given-names>
</name>
<xref ref-type="aff" rid="af2">2</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Shipley</surname>
<given-names>Bill</given-names>
</name>
<xref ref-type="aff" rid="af3">3</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Reich</surname>
<given-names>Peter B.</given-names>
</name>
<xref ref-type="aff" rid="af4">4</xref>
<xref ref-type="aff" rid="af5">5</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Deffuant</surname>
<given-names>Guillaume</given-names>
</name>
<xref ref-type="aff" rid="af1">1</xref>
</contrib>
<aff id="af1"><label>1</label>
<addr-line>LISC – Laboratoire d'Ingénierie pour les Systèmes complexes, IRSTEA, 9 avenue Blaise Pascal, CS 20085, 63178 Aubière, France</addr-line>
</aff>
<aff id="af2"><label>2</label>
<addr-line>Université Sidi Mohamed Ben Abdellah, Faculté des sciences Dhrar El Mehraz, Département de biologie, BP 1796, Fès, Atlas, Morocco</addr-line>
</aff>
<aff id="af3"><label>3</label>
<addr-line>Département de biologie, Université de Sherbrooke, Sherbrooke (Qc), J1K 2R1, Canada</addr-line>
</aff>
<aff id="af4"><label>4</label>
<addr-line>Department of Forest Resources, University of Minnesota, St. Paul MN 55108, USA</addr-line>
</aff>
<aff id="af5"><label>5</label>
<addr-line>Hawkesbury Institute for the Environment, University of Western Sidney, Locked Bag 1797, Penrith, NSW 2751, Australia</addr-line>
</aff>
</contrib-group>
<author-notes><corresp id="cor1"><label>*</label>
For correspondence. E-mail <email>franck.jabot@irstea.fr</email>
</corresp>
</author-notes>
<pub-date pub-type="ppub"><month>9</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub"><day>02</day>
<month>7</month>
<year>2014</year>
</pub-date>
<volume>114</volume>
<issue>3</issue>
<fpage>513</fpage>
<lpage>524</lpage>
<history><date date-type="received"><day>25</day>
<month>10</month>
<year>2013</year>
</date>
<date date-type="rev-request"><day>02</day>
<month>12</month>
<year>2013</year>
</date>
<date date-type="accepted"><day>12</day>
<month>5</month>
<year>2014</year>
</date>
</history>
<permissions><copyright-statement>© The Author 2014. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oup.com</copyright-statement>
<copyright-year>2014</copyright-year>
</permissions>
<self-uri content-type="pdf" xlink:type="simple" xlink:href="mcu128.pdf"></self-uri>
<abstract><sec><title>Background and Aims</title>
<p>Simple models of herbaceous plant growth based on optimal partitioning theory predict, at steady state, an isometric relationship between shoot and root biomass during plant ontogeny, i.e. a constant root–shoot ratio. This prediction has received mixed empirical support, suggesting either that optimal partitioning is too coarse an assumption to model plant biomass allocation, or that additional processes need to be modelled to account for empirical findings within the optimal partitioning framework. In this study, simulations are used to compare quantitatively two potential explanations for observed non-isometric relationships, namely nutrient limitation during the experiments and initial developmental constraints.</p>
</sec>
<sec><title>Methods</title>
<p>A simple plant growth model was built to simulate the growth of herbaceous species, based on optimal partitioning theory combined with empirically measured plant functional traits. Its ability to reproduce plant relative growth rate and final root weight ratio was assessed against previously published data. Predicted root–shoot ratios during plant ontogeny were compared with experimental observations. The effects of nutrient limitation and initial developmental constraints on root–shoot ratios were then tested.</p>
</sec>
<sec><title>Key Results</title>
<p>The model was found to reproduce overall plant growth patterns accurately, but failed, in its simplest form, at explaining non-isometric growth trajectories. Both nutrient limitation and ontogenetic developmental constraints were further shown to cause transient dynamics resulting in a deviation from isometry. Nitrogen limitation alone was not sufficient to explain the observed trajectories of most plant species. The inclusion of initial developmental constraints (fixed non-optimal initial root–shoot ratios) enabled the reproduction of the observed trajectories and were consistent with observed initial root–shoot ratios.</p>
</sec>
<sec><title>Conclusions</title>
<p>This study highlights the fact that considering transient dynamics enables theoretical predictions based on optimal partitioning to be reconciled with empirically measured ontogenetic root–shoot allometries. The transient dynamics cannot be solely explained by nutrient limitation during the experiments, pointing to a likely role for initial developmental constraints in the observed non-isometric growth trajectories.</p>
</sec>
</abstract>
<kwd-group><kwd>Allometry</kwd>
<kwd>biomass partitioning</kwd>
<kwd>functional trait</kwd>
<kwd>grassland</kwd>
<kwd>plant growth model</kwd>
<kwd>model selection</kwd>
<kwd>ontogenetic shift</kwd>
<kwd>optimal partitioning theory</kwd>
<kwd>root–shoot ratio</kwd>
<kwd>transient dynamics</kwd>
</kwd-group>
</article-meta>
</front>
</pmc>
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