Hebeloma crustuliniforme facilitates ammonium and nitrate assimilation in trembling aspen (Populus tremuloides) seedlings.
Identifieur interne : 002E44 ( Main/Exploration ); précédent : 002E43; suivant : 002E45Hebeloma crustuliniforme facilitates ammonium and nitrate assimilation in trembling aspen (Populus tremuloides) seedlings.
Auteurs : J Aurea Siemens [Canada] ; M Nica Calvo-Polanco ; Janusz J. ZwiazekSource :
- Tree physiology [ 1758-4469 ] ; 2011.
Descripteurs français
- KwdFr :
- Azote (métabolisme), Composés d'ammonium quaternaire (métabolisme), Hebeloma (enzymologie), Mycorhizes (physiologie), Nitrates (métabolisme), Plant (croissance et développement), Plant (microbiologie), Plant (métabolisme), Populus (croissance et développement), Populus (microbiologie), Populus (métabolisme), Structures de plante (métabolisme), Symbiose (physiologie).
- MESH :
- croissance et développement : Plant, Populus.
- enzymologie : Hebeloma.
- microbiologie : Plant, Populus.
- métabolisme : Azote, Composés d'ammonium quaternaire, Nitrates, Plant, Populus, Structures de plante.
- physiologie : Mycorhizes, Symbiose.
English descriptors
- KwdEn :
- Hebeloma (enzymology), Mycorrhizae (physiology), Nitrates (metabolism), Nitrogen (metabolism), Plant Structures (metabolism), Populus (growth & development), Populus (metabolism), Populus (microbiology), Quaternary Ammonium Compounds (metabolism), Seedlings (growth & development), Seedlings (metabolism), Seedlings (microbiology), Symbiosis (physiology).
- MESH :
- chemical , metabolism : Nitrates, Nitrogen, Quaternary Ammonium Compounds.
- enzymology : Hebeloma.
- growth & development : Populus, Seedlings.
- metabolism : Plant Structures, Populus, Seedlings.
- microbiology : Populus, Seedlings.
- physiology : Mycorrhizae, Symbiosis.
Abstract
This study examined the role of ectomycorrhizal associations in nitrogen assimilation of Populus tremuloides seedlings. Seedlings were inoculated with Hebeloma crustuliniforme and compared with non-inoculated plants. Nitrogen-metabolizing enzymatic properties were also determined in H. crustuliniforme grown in sterile culture. The seedlings and fungal cultures were subjected to nitrogen treatments (including NO₃⁻, NH₄⁺ and a combination of NO₃⁻ + NH₄⁺) for 2 months to examine the effects on growth, nitrogen-assimilating enzyme activities and xylem sap concentrations of NH₄⁺ and NO₃⁻. Seedlings were also provided for 3 days with ¹⁵N-labeled NH₄⁺ and NO₃⁻, and leaf and root ¹⁵N content relative to total nitrogen was measured. Both NO₃⁻ and NH₄⁺ were effective in supporting seedling growth when either form was provided separately. When NO₃⁻ and NH₄⁺ were provided together, seedling growth decreased while enzymatic assimilation of NH₄⁺ increased. Additionally, nitrogen assimilation in inoculated seedlings was less affected by the form of nitrogen compared with non-inoculated plants. Fungal ability to enzymatically respond to and assimilate NH₄⁺ combined with aspen's enzymatic responsiveness to NO₃⁻ was likely the reason for efficient assimilation of both nitrogen forms by mycorrhizal plants.
DOI: 10.1093/treephys/tpr104
PubMed: 22011965
Affiliations:
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Seedlings were inoculated with Hebeloma crustuliniforme and compared with non-inoculated plants. Nitrogen-metabolizing enzymatic properties were also determined in H. crustuliniforme grown in sterile culture. The seedlings and fungal cultures were subjected to nitrogen treatments (including NO₃⁻, NH₄⁺ and a combination of NO₃⁻ + NH₄⁺) for 2 months to examine the effects on growth, nitrogen-assimilating enzyme activities and xylem sap concentrations of NH₄⁺ and NO₃⁻. Seedlings were also provided for 3 days with ¹⁵N-labeled NH₄⁺ and NO₃⁻, and leaf and root ¹⁵N content relative to total nitrogen was measured. Both NO₃⁻ and NH₄⁺ were effective in supporting seedling growth when either form was provided separately. When NO₃⁻ and NH₄⁺ were provided together, seedling growth decreased while enzymatic assimilation of NH₄⁺ increased. Additionally, nitrogen assimilation in inoculated seedlings was less affected by the form of nitrogen compared with non-inoculated plants. Fungal ability to enzymatically respond to and assimilate NH₄⁺ combined with aspen's enzymatic responsiveness to NO₃⁻ was likely the reason for efficient assimilation of both nitrogen forms by mycorrhizal plants.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">22011965</PMID><DateCompleted><Year>2012</Year><Month>04</Month><Day>24</Day></DateCompleted><DateRevised><Year>2015</Year><Month>11</Month><Day>19</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1758-4469</ISSN><JournalIssue CitedMedium="Internet"><Volume>31</Volume><Issue>11</Issue><PubDate><Year>2011</Year><Month>Nov</Month></PubDate></JournalIssue><Title>Tree physiology</Title><ISOAbbreviation>Tree Physiol</ISOAbbreviation></Journal><ArticleTitle>Hebeloma crustuliniforme facilitates ammonium and nitrate assimilation in trembling aspen (Populus tremuloides) seedlings.</ArticleTitle><Pagination><MedlinePgn>1238-50</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1093/treephys/tpr104</ELocationID><Abstract><AbstractText>This study examined the role of ectomycorrhizal associations in nitrogen assimilation of Populus tremuloides seedlings. Seedlings were inoculated with Hebeloma crustuliniforme and compared with non-inoculated plants. Nitrogen-metabolizing enzymatic properties were also determined in H. crustuliniforme grown in sterile culture. The seedlings and fungal cultures were subjected to nitrogen treatments (including NO₃⁻, NH₄⁺ and a combination of NO₃⁻ + NH₄⁺) for 2 months to examine the effects on growth, nitrogen-assimilating enzyme activities and xylem sap concentrations of NH₄⁺ and NO₃⁻. Seedlings were also provided for 3 days with ¹⁵N-labeled NH₄⁺ and NO₃⁻, and leaf and root ¹⁵N content relative to total nitrogen was measured. Both NO₃⁻ and NH₄⁺ were effective in supporting seedling growth when either form was provided separately. When NO₃⁻ and NH₄⁺ were provided together, seedling growth decreased while enzymatic assimilation of NH₄⁺ increased. Additionally, nitrogen assimilation in inoculated seedlings was less affected by the form of nitrogen compared with non-inoculated plants. 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Zwiazek</name></noCountry><country name="Canada"><noRegion><name sortKey="Siemens, J Aurea" sort="Siemens, J Aurea" uniqKey="Siemens J" first="J Aurea" last="Siemens">J Aurea Siemens</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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