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Life span and structure of ephemeral root modules of different functional groups from a desert system.

Identifieur interne : 001789 ( Main/Exploration ); précédent : 001788; suivant : 001790

Life span and structure of ephemeral root modules of different functional groups from a desert system.

Auteurs : Bo Liu [République populaire de Chine] ; Junxia He [République populaire de Chine] ; Fanjiang Zeng [République populaire de Chine] ; Jiaqiang Lei [République populaire de Chine] ; Stefan K. Arndt [Australie]

Source :

RBID : pubmed:26856386

Descripteurs français

English descriptors

Abstract

The terminal branch orders of plant root systems have been proposed as short-lived 'ephemeral' modules specialized for resource absorption. The occurrence of ephemeral root modules has so far only been reported for a temperate tree species and it is unclear if the concept also applies to other woody (shrub, tree) and herb species. Fine roots of 12 perennial dicotyledonous herb, shrub and tree species were monitored for two growing seasons using a branch-order classification, sequential sampling and rhizotrons in the Taklamakan desert. Two root modules existed in all three plant functional groups. Among the first five branch orders, the first two (perennial herbs, shrubs) or three (trees) root orders were ephemeral and had a primary anatomical structure, high nitrogen (N) concentrations, high respiration rates and very short life spans of 1-4 months, whereas the last two branch orders in all functional groups were perennial, with thicker diameters, no or collapsed cortex, distinct secondary growth, low N concentrations, low respiration rates, but much longer life spans. Ephemeral, short-lived root modules and long-lived, persistent root modules seem to be a general feature across many plant functional groups and could represent a basic root system design.

DOI: 10.1111/nph.13880
PubMed: 26856386


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">The terminal branch orders of plant root systems have been proposed as short-lived 'ephemeral' modules specialized for resource absorption. The occurrence of ephemeral root modules has so far only been reported for a temperate tree species and it is unclear if the concept also applies to other woody (shrub, tree) and herb species. Fine roots of 12 perennial dicotyledonous herb, shrub and tree species were monitored for two growing seasons using a branch-order classification, sequential sampling and rhizotrons in the Taklamakan desert. Two root modules existed in all three plant functional groups. Among the first five branch orders, the first two (perennial herbs, shrubs) or three (trees) root orders were ephemeral and had a primary anatomical structure, high nitrogen (N) concentrations, high respiration rates and very short life spans of 1-4 months, whereas the last two branch orders in all functional groups were perennial, with thicker diameters, no or collapsed cortex, distinct secondary growth, low N concentrations, low respiration rates, but much longer life spans. Ephemeral, short-lived root modules and long-lived, persistent root modules seem to be a general feature across many plant functional groups and could represent a basic root system design.</div>
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<MeshHeading>
<DescriptorName UI="D010944" MajorTopicYN="N">Plants</DescriptorName>
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<Keyword MajorTopicYN="Y">anatomical traits</Keyword>
<Keyword MajorTopicYN="Y">ephemeral root module</Keyword>
<Keyword MajorTopicYN="Y">fine roots</Keyword>
<Keyword MajorTopicYN="Y">functional groups</Keyword>
<Keyword MajorTopicYN="Y">life span</Keyword>
<Keyword MajorTopicYN="Y">modified rhizotron</Keyword>
<Keyword MajorTopicYN="Y">nitrogen concentration</Keyword>
<Keyword MajorTopicYN="Y">respiration</Keyword>
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<Year>2015</Year>
<Month>10</Month>
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<Year>2015</Year>
<Month>12</Month>
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<Month>2</Month>
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<PubMedPubDate PubStatus="medline">
<Year>2018</Year>
<Month>1</Month>
<Day>31</Day>
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</History>
<PublicationStatus>ppublish</PublicationStatus>
<ArticleIdList>
<ArticleId IdType="pubmed">26856386</ArticleId>
<ArticleId IdType="doi">10.1111/nph.13880</ArticleId>
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</pubmed>
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<country>
<li>Australie</li>
<li>République populaire de Chine</li>
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<region>
<li>Victoria (État)</li>
</region>
<settlement>
<li>Melbourne</li>
</settlement>
<orgName>
<li>Université de Melbourne</li>
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<tree>
<country name="République populaire de Chine">
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<name sortKey="Liu, Bo" sort="Liu, Bo" uniqKey="Liu B" first="Bo" last="Liu">Bo Liu</name>
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<name sortKey="He, Junxia" sort="He, Junxia" uniqKey="He J" first="Junxia" last="He">Junxia He</name>
<name sortKey="He, Junxia" sort="He, Junxia" uniqKey="He J" first="Junxia" last="He">Junxia He</name>
<name sortKey="Lei, Jiaqiang" sort="Lei, Jiaqiang" uniqKey="Lei J" first="Jiaqiang" last="Lei">Jiaqiang Lei</name>
<name sortKey="Lei, Jiaqiang" sort="Lei, Jiaqiang" uniqKey="Lei J" first="Jiaqiang" last="Lei">Jiaqiang Lei</name>
<name sortKey="Liu, Bo" sort="Liu, Bo" uniqKey="Liu B" first="Bo" last="Liu">Bo Liu</name>
<name sortKey="Zeng, Fanjiang" sort="Zeng, Fanjiang" uniqKey="Zeng F" first="Fanjiang" last="Zeng">Fanjiang Zeng</name>
<name sortKey="Zeng, Fanjiang" sort="Zeng, Fanjiang" uniqKey="Zeng F" first="Fanjiang" last="Zeng">Fanjiang Zeng</name>
<name sortKey="Zeng, Fanjiang" sort="Zeng, Fanjiang" uniqKey="Zeng F" first="Fanjiang" last="Zeng">Fanjiang Zeng</name>
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<country name="Australie">
<region name="Victoria (État)">
<name sortKey="Arndt, Stefan K" sort="Arndt, Stefan K" uniqKey="Arndt S" first="Stefan K" last="Arndt">Stefan K. Arndt</name>
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