Hypoxia Affects Nitrogen Uptake and Distribution in Young Poplar (Populus × canescens) Trees.
Identifieur interne : 001D04 ( Main/Exploration ); précédent : 001D03; suivant : 001D05Hypoxia Affects Nitrogen Uptake and Distribution in Young Poplar (Populus × canescens) Trees.
Auteurs : Bin Liu [Allemagne] ; Heinz Rennenberg [Allemagne] ; Jürgen Kreuzwieser [Allemagne]Source :
- PloS one [ 1932-6203 ] ; 2015.
Descripteurs français
- KwdFr :
- Azote (métabolisme), Hypoxie (MeSH), Oxygène (métabolisme), Populus (croissance et développement), Populus (métabolisme), Pousses de plante (croissance et développement), Pousses de plante (métabolisme), Racines de plante (croissance et développement), Racines de plante (métabolisme), Respiration cellulaire (physiologie), Sol (composition chimique).
- MESH :
- composition chimique : Sol.
- croissance et développement : Populus, Pousses de plante, Racines de plante.
- métabolisme : Azote, Oxygène, Populus, Pousses de plante, Racines de plante.
- physiologie : Respiration cellulaire.
- Hypoxie.
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : Soil.
- chemical , metabolism : Nitrogen, Oxygen.
- growth & development : Plant Roots, Plant Shoots, Populus.
- metabolism : Plant Roots, Plant Shoots, Populus.
- physiology : Cell Respiration.
- Hypoxia.
Abstract
The present study with young poplar trees aimed at characterizing the effect of O2 shortage in the soil on net uptake of NO3- and NH4+ and the spatial distribution of the N taken up. Moreover, we assessed biomass increment as well as N status of the trees affected by O2 deficiency. For this purpose, an experiment was conducted in which hydroponically grown young poplar trees were exposed to hypoxic and normoxic (control) conditions for 14 days. 15N-labelled NO3- and NH4+ were used to elucidate N uptake and distribution of currently absorbed N and N allocation rates in the plants. Whereas shoot biomass was not affected by soil O2 deficiency, it significantly reduced root biomass and, consequently, the root-to-shoot ratio. Uptake of NO3- but not of NH4+ by the roots of the trees was severely impaired by hypoxia. As a consequence of reduced N uptake, the N content of all poplar tissues was significantly diminished. Under normoxic control conditions, the spatial distribution of currently absorbed N and N allocation rates differed depending on the N source. Whereas NO3- derived N was mainly transported to the younger parts of the shoot, particularly to the developing and young mature leaves, N derived from NH4+ was preferentially allocated to older parts of the shoot, mainly to wood and bark. Soil O2 deficiency enhanced this differential allocation pattern. From these results we assume that NO3- was assimilated in developing tissues and preferentially used to maintain growth and ensure plant survival under hypoxia, whereas NH4+ based N was used for biosynthesis of storage proteins in bark and wood of the trees. Still, further studies are needed to understand the mechanistic basis as well as the eco-physiological advantages of such differential allocation patterns.
DOI: 10.1371/journal.pone.0136579
PubMed: 26308462
PubMed Central: PMC4550380
Affiliations:
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Shoots</term><term>Populus</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Plant Roots</term><term>Plant Shoots</term><term>Populus</term></keywords><keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Azote</term><term>Oxygène</term><term>Populus</term><term>Pousses de plante</term><term>Racines de plante</term></keywords><keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Respiration cellulaire</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Cell Respiration</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Hypoxia</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Hypoxie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The present study with young poplar trees aimed at characterizing the effect of O2 shortage in the soil on net uptake of NO3- and NH4+ and the spatial distribution of the N taken up. Moreover, we assessed biomass increment as well as N status of the trees affected by O2 deficiency. For this purpose, an experiment was conducted in which hydroponically grown young poplar trees were exposed to hypoxic and normoxic (control) conditions for 14 days. 15N-labelled NO3- and NH4+ were used to elucidate N uptake and distribution of currently absorbed N and N allocation rates in the plants. Whereas shoot biomass was not affected by soil O2 deficiency, it significantly reduced root biomass and, consequently, the root-to-shoot ratio. Uptake of NO3- but not of NH4+ by the roots of the trees was severely impaired by hypoxia. As a consequence of reduced N uptake, the N content of all poplar tissues was significantly diminished. Under normoxic control conditions, the spatial distribution of currently absorbed N and N allocation rates differed depending on the N source. Whereas NO3- derived N was mainly transported to the younger parts of the shoot, particularly to the developing and young mature leaves, N derived from NH4+ was preferentially allocated to older parts of the shoot, mainly to wood and bark. Soil O2 deficiency enhanced this differential allocation pattern. From these results we assume that NO3- was assimilated in developing tissues and preferentially used to maintain growth and ensure plant survival under hypoxia, whereas NH4+ based N was used for biosynthesis of storage proteins in bark and wood of the trees. Still, further studies are needed to understand the mechanistic basis as well as the eco-physiological advantages of such differential allocation patterns. </div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">26308462</PMID><DateCompleted><Year>2016</Year><Month>05</Month><Day>26</Day></DateCompleted><DateRevised><Year>2020</Year><Month>03</Month><Day>06</Day></DateRevised><Article PubModel="Electronic-eCollection"><Journal><ISSN IssnType="Electronic">1932-6203</ISSN><JournalIssue CitedMedium="Internet"><Volume>10</Volume><Issue>8</Issue><PubDate><Year>2015</Year></PubDate></JournalIssue><Title>PloS one</Title><ISOAbbreviation>PLoS One</ISOAbbreviation></Journal><ArticleTitle>Hypoxia Affects Nitrogen Uptake and Distribution in Young Poplar (Populus × canescens) Trees.</ArticleTitle><Pagination><MedlinePgn>e0136579</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1371/journal.pone.0136579</ELocationID><Abstract><AbstractText>The present study with young poplar trees aimed at characterizing the effect of O2 shortage in the soil on net uptake of NO3- and NH4+ and the spatial distribution of the N taken up. Moreover, we assessed biomass increment as well as N status of the trees affected by O2 deficiency. For this purpose, an experiment was conducted in which hydroponically grown young poplar trees were exposed to hypoxic and normoxic (control) conditions for 14 days. 15N-labelled NO3- and NH4+ were used to elucidate N uptake and distribution of currently absorbed N and N allocation rates in the plants. Whereas shoot biomass was not affected by soil O2 deficiency, it significantly reduced root biomass and, consequently, the root-to-shoot ratio. Uptake of NO3- but not of NH4+ by the roots of the trees was severely impaired by hypoxia. As a consequence of reduced N uptake, the N content of all poplar tissues was significantly diminished. Under normoxic control conditions, the spatial distribution of currently absorbed N and N allocation rates differed depending on the N source. Whereas NO3- derived N was mainly transported to the younger parts of the shoot, particularly to the developing and young mature leaves, N derived from NH4+ was preferentially allocated to older parts of the shoot, mainly to wood and bark. Soil O2 deficiency enhanced this differential allocation pattern. From these results we assume that NO3- was assimilated in developing tissues and preferentially used to maintain growth and ensure plant survival under hypoxia, whereas NH4+ based N was used for biosynthesis of storage proteins in bark and wood of the trees. Still, further studies are needed to understand the mechanistic basis as well as the eco-physiological advantages of such differential allocation patterns. </AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Liu</LastName><ForeName>Bin</ForeName><Initials>B</Initials><AffiliationInfo><Affiliation>Chair of Tree Physiology, Institute of Forest Sciences, University of Freiburg, Freiburg, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Rennenberg</LastName><ForeName>Heinz</ForeName><Initials>H</Initials><AffiliationInfo><Affiliation>Chair of Tree Physiology, Institute of Forest Sciences, University of Freiburg, Freiburg, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Kreuzwieser</LastName><ForeName>Jürgen</ForeName><Initials>J</Initials><AffiliationInfo><Affiliation>Chair of Tree Physiology, Institute of Forest Sciences, University of Freiburg, Freiburg, 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