Transfer of nitrogen from a tropical legume tree to an associated fodder grass via root exudation and common mycelial networks.
Identifieur interne : 002925 ( Main/Corpus ); précédent : 002924; suivant : 002926Transfer of nitrogen from a tropical legume tree to an associated fodder grass via root exudation and common mycelial networks.
Auteurs : Riina Jalonen ; Pekka Nygren ; Jorge SierraSource :
- Plant, cell & environment [ 1365-3040 ] ; 2009.
English descriptors
- KwdEn :
- MESH :
- chemical , analysis : Soil.
- chemical , metabolism : Nitrogen, Nitrogen Isotopes.
- metabolism : Fabaceae, Mycelium, Mycorrhizae, Plant Roots, Poaceae, Trees.
- Nitrogen Fixation.
Abstract
Symbiotic dinitrogen fixation by legume trees represents a substantial N input in agroforestry systems, which may benefit the associated crops. Applying (15)N labelling, we studied N transfer via common mycelial networks (CMN) and root exudation from the legume tree Gliricidia sepium to the associated fodder grass Dichantium aristatum. The plants were grown in greenhouse in shared pots in full interaction (treatment FI) or with their root systems separated with a fine mesh that allowed N transfer via CMN only (treatment MY). Tree root exudation was measured separately with hydroponics. Nitrogen transfer estimates were based on the isotopic signature of N (delta(15)N) transferred from the donor. We obtained a range for estimates by calculating transfer with delta(15)N of tree roots and exudates. Nitrogen transfer was 3.7-14.0 and 0.7-2.5% of grass total N in treatments FI and MY, respectively. Root delta(15)N gave the lower and exudate delta(15)N the higher estimates. Transfer in FI probably occurred mainly via root exudation. Transfer in MY correlated negatively with grass root N concentration, implying that it was driven by source-sink relationships between the plants. The range of transfer estimates, depending on source delta(15)N applied, indicates the need of understanding the transfer mechanisms as a basis for reliable estimates.
DOI: 10.1111/j.1365-3040.2009.02004.x
PubMed: 19552666
Links to Exploration step
pubmed:19552666Le document en format XML
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Applying (15)N labelling, we studied N transfer via common mycelial networks (CMN) and root exudation from the legume tree Gliricidia sepium to the associated fodder grass Dichantium aristatum. The plants were grown in greenhouse in shared pots in full interaction (treatment FI) or with their root systems separated with a fine mesh that allowed N transfer via CMN only (treatment MY). Tree root exudation was measured separately with hydroponics. Nitrogen transfer estimates were based on the isotopic signature of N (delta(15)N) transferred from the donor. We obtained a range for estimates by calculating transfer with delta(15)N of tree roots and exudates. Nitrogen transfer was 3.7-14.0 and 0.7-2.5% of grass total N in treatments FI and MY, respectively. Root delta(15)N gave the lower and exudate delta(15)N the higher estimates. Transfer in FI probably occurred mainly via root exudation. Transfer in MY correlated negatively with grass root N concentration, implying that it was driven by source-sink relationships between the plants. The range of transfer estimates, depending on source delta(15)N applied, indicates the need of understanding the transfer mechanisms as a basis for reliable estimates.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">19552666</PMID><DateCompleted><Year>2009</Year><Month>10</Month><Day>19</Day></DateCompleted><DateRevised><Year>2017</Year><Month>11</Month><Day>16</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1365-3040</ISSN><JournalIssue CitedMedium="Internet"><Volume>32</Volume><Issue>10</Issue><PubDate><Year>2009</Year><Month>Oct</Month></PubDate></JournalIssue><Title>Plant, cell & environment</Title><ISOAbbreviation>Plant Cell Environ</ISOAbbreviation></Journal><ArticleTitle>Transfer of nitrogen from a tropical legume tree to an associated fodder grass via root exudation and common mycelial networks.</ArticleTitle><Pagination><MedlinePgn>1366-76</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1111/j.1365-3040.2009.02004.x</ELocationID><Abstract><AbstractText>Symbiotic dinitrogen fixation by legume trees represents a substantial N input in agroforestry systems, which may benefit the associated crops. Applying (15)N labelling, we studied N transfer via common mycelial networks (CMN) and root exudation from the legume tree Gliricidia sepium to the associated fodder grass Dichantium aristatum. The plants were grown in greenhouse in shared pots in full interaction (treatment FI) or with their root systems separated with a fine mesh that allowed N transfer via CMN only (treatment MY). Tree root exudation was measured separately with hydroponics. Nitrogen transfer estimates were based on the isotopic signature of N (delta(15)N) transferred from the donor. We obtained a range for estimates by calculating transfer with delta(15)N of tree roots and exudates. Nitrogen transfer was 3.7-14.0 and 0.7-2.5% of grass total N in treatments FI and MY, respectively. Root delta(15)N gave the lower and exudate delta(15)N the higher estimates. Transfer in FI probably occurred mainly via root exudation. Transfer in MY correlated negatively with grass root N concentration, implying that it was driven by source-sink relationships between the plants. The range of transfer estimates, depending on source delta(15)N applied, indicates the need of understanding the transfer mechanisms as a basis for reliable estimates.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Jalonen</LastName><ForeName>Riina</ForeName><Initials>R</Initials><AffiliationInfo><Affiliation>Department of Forest Ecology, University of Helsinki, Helsinki, Finland.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Nygren</LastName><ForeName>Pekka</ForeName><Initials>P</Initials></Author><Author ValidYN="Y"><LastName>Sierra</LastName><ForeName>Jorge</ForeName><Initials>J</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2009</Year><Month>06</Month><Day>10</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Plant Cell Environ</MedlineTA><NlmUniqueID>9309004</NlmUniqueID><ISSNLinking>0140-7791</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance UI="D009587">Nitrogen Isotopes</NameOfSubstance></Chemical><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance UI="D012987">Soil</NameOfSubstance></Chemical><Chemical><RegistryNumber>N762921K75</RegistryNumber><NameOfSubstance UI="D009584">Nitrogen</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D007887" MajorTopicYN="N">Fabaceae</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D025282" MajorTopicYN="N">Mycelium</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D038821" MajorTopicYN="N">Mycorrhizae</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D009584" MajorTopicYN="N">Nitrogen</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D009586" MajorTopicYN="N">Nitrogen Fixation</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D009587" MajorTopicYN="N">Nitrogen Isotopes</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018517" MajorTopicYN="N">Plant Roots</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D006109" MajorTopicYN="N">Poaceae</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="Y">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D012987" MajorTopicYN="N">Soil</DescriptorName><QualifierName UI="Q000032" MajorTopicYN="N">analysis</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D014197" MajorTopicYN="N">Trees</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="entrez"><Year>2009</Year><Month>6</Month><Day>26</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2009</Year><Month>6</Month><Day>26</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2009</Year><Month>10</Month><Day>20</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">19552666</ArticleId><ArticleId IdType="pii">PCE2004</ArticleId><ArticleId IdType="doi">10.1111/j.1365-3040.2009.02004.x</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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