Carbon dioxide concentration and nitrogen input affect the C and N storage pools in Amanita muscaria-Picea abies mycorrhizae.
Identifieur interne : 003A83 ( Main/Exploration ); précédent : 003A82; suivant : 003A84Carbon dioxide concentration and nitrogen input affect the C and N storage pools in Amanita muscaria-Picea abies mycorrhizae.
Auteurs : K. Turnau [Pologne] ; A. Berger ; A. Loewe ; W. Einig ; R. Hampp ; M. Chalot ; P. Dizengremel ; I. KottkeSource :
- Tree physiology [ 0829-318X ] ; 2001.
Descripteurs français
- KwdFr :
- Amanita (physiologie), Arbres (microbiologie), Arbres (physiologie), Azote (MeSH), Dioxyde de carbone (MeSH), Feuilles de plante (MeSH), Glycogène (MeSH), Picea (microbiologie), Picea (physiologie), Pousses de plante (physiologie), Protéines de répression (MeSH), Racines de plante (microbiologie), Racines de plante (physiologie).
- MESH :
- microbiologie : Arbres, Picea, Racines de plante.
- physiologie : Amanita, Arbres, Picea, Pousses de plante, Racines de plante.
- Azote, Dioxyde de carbone, Feuilles de plante, Glycogène, Protéines de répression.
English descriptors
- KwdEn :
- MESH :
- chemical : Carbon Dioxide, Glycogen, Nitrogen, Repressor Proteins.
- microbiology : Picea, Plant Roots, Trees.
- physiology : Amanita, Picea, Plant Roots, Plant Shoots, Trees.
- Plant Leaves.
Abstract
We studied the influence of elevated atmospheric CO2 concentration ([CO2]) on the vacuolar storage pool of nitrogen-containing compounds and on the glycogen pool in the hyphal sheath of Amanita muscaria (L. ex Fr.) Hooker-Picea abies L. Karst. mycorrhizae grown with two concentrations of ammonium in the substrate. Mycorrhizal seedlings were grown in petri dishes on agar containing 5.3 or 53 mg N l(-1) and exposed to 350 or 700 microl CO2 l(-1) for 5 or 7 weeks, respectively. Numbers and area of nitrogen-containing bodies in the vacuoles of the mycorrhizal fungus were determined by light microscopy linked to an image analysis system. The relative concentration of nitrogen in the vacuolar bodies was measured by electron energy loss spectroscopy (EELS). Glycogen stored in the cytosol was determined at the ultrastructural level by image analysis after staining the sections (PATAg test). Shoot dry weight, net photosynthesis and relative amounts of N in vacuolar bodies were greater at the higher N and CO2 concentrations. The numbers and areas of vacuolar N-containing bodies were significantly greater at the higher N concentration only at ambient [CO2]. In the same treatment the percentage of hyphae containing glycogen declined to nearly zero. We conclude that, in the high N/low [CO2] treatment, the mycorrhizal fungus had an insufficient carbohydrate supply, partly because of increased amino acid synthesis by the non-mycorrhizal rootlets. When [CO2] was increased, the equilibrium between storage of glycogen and N-containing compounds was reestablished.
DOI: 10.1093/treephys/21.2-3.93
PubMed: 11303653
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Carbon Dioxide (MeSH)</term>
<term>Glycogen (MeSH)</term>
<term>Nitrogen (MeSH)</term>
<term>Picea (microbiology)</term>
<term>Picea (physiology)</term>
<term>Plant Leaves (MeSH)</term>
<term>Plant Roots (microbiology)</term>
<term>Plant Roots (physiology)</term>
<term>Plant Shoots (physiology)</term>
<term>Repressor Proteins (MeSH)</term>
<term>Trees (microbiology)</term>
<term>Trees (physiology)</term>
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<keywords scheme="KwdFr" xml:lang="fr"><term>Amanita (physiologie)</term>
<term>Arbres (microbiologie)</term>
<term>Arbres (physiologie)</term>
<term>Azote (MeSH)</term>
<term>Dioxyde de carbone (MeSH)</term>
<term>Feuilles de plante (MeSH)</term>
<term>Glycogène (MeSH)</term>
<term>Picea (microbiologie)</term>
<term>Picea (physiologie)</term>
<term>Pousses de plante (physiologie)</term>
<term>Protéines de répression (MeSH)</term>
<term>Racines de plante (microbiologie)</term>
<term>Racines de plante (physiologie)</term>
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<keywords scheme="MESH" type="chemical" xml:lang="en"><term>Carbon Dioxide</term>
<term>Glycogen</term>
<term>Nitrogen</term>
<term>Repressor Proteins</term>
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<term>Picea</term>
<term>Racines de plante</term>
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<keywords scheme="MESH" qualifier="microbiology" xml:lang="en"><term>Picea</term>
<term>Plant Roots</term>
<term>Trees</term>
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<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Amanita</term>
<term>Arbres</term>
<term>Picea</term>
<term>Pousses de plante</term>
<term>Racines de plante</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Amanita</term>
<term>Picea</term>
<term>Plant Roots</term>
<term>Plant Shoots</term>
<term>Trees</term>
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<keywords scheme="MESH" xml:lang="en"><term>Plant Leaves</term>
</keywords>
<keywords scheme="MESH" xml:lang="fr"><term>Azote</term>
<term>Dioxyde de carbone</term>
<term>Feuilles de plante</term>
<term>Glycogène</term>
<term>Protéines de répression</term>
</keywords>
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<front><div type="abstract" xml:lang="en">We studied the influence of elevated atmospheric CO2 concentration ([CO2]) on the vacuolar storage pool of nitrogen-containing compounds and on the glycogen pool in the hyphal sheath of Amanita muscaria (L. ex Fr.) Hooker-Picea abies L. Karst. mycorrhizae grown with two concentrations of ammonium in the substrate. Mycorrhizal seedlings were grown in petri dishes on agar containing 5.3 or 53 mg N l(-1) and exposed to 350 or 700 microl CO2 l(-1) for 5 or 7 weeks, respectively. Numbers and area of nitrogen-containing bodies in the vacuoles of the mycorrhizal fungus were determined by light microscopy linked to an image analysis system. The relative concentration of nitrogen in the vacuolar bodies was measured by electron energy loss spectroscopy (EELS). Glycogen stored in the cytosol was determined at the ultrastructural level by image analysis after staining the sections (PATAg test). Shoot dry weight, net photosynthesis and relative amounts of N in vacuolar bodies were greater at the higher N and CO2 concentrations. The numbers and areas of vacuolar N-containing bodies were significantly greater at the higher N concentration only at ambient [CO2]. In the same treatment the percentage of hyphae containing glycogen declined to nearly zero. We conclude that, in the high N/low [CO2] treatment, the mycorrhizal fungus had an insufficient carbohydrate supply, partly because of increased amino acid synthesis by the non-mycorrhizal rootlets. When [CO2] was increased, the equilibrium between storage of glycogen and N-containing compounds was reestablished.</div>
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<Abstract><AbstractText>We studied the influence of elevated atmospheric CO2 concentration ([CO2]) on the vacuolar storage pool of nitrogen-containing compounds and on the glycogen pool in the hyphal sheath of Amanita muscaria (L. ex Fr.) Hooker-Picea abies L. Karst. mycorrhizae grown with two concentrations of ammonium in the substrate. Mycorrhizal seedlings were grown in petri dishes on agar containing 5.3 or 53 mg N l(-1) and exposed to 350 or 700 microl CO2 l(-1) for 5 or 7 weeks, respectively. Numbers and area of nitrogen-containing bodies in the vacuoles of the mycorrhizal fungus were determined by light microscopy linked to an image analysis system. The relative concentration of nitrogen in the vacuolar bodies was measured by electron energy loss spectroscopy (EELS). Glycogen stored in the cytosol was determined at the ultrastructural level by image analysis after staining the sections (PATAg test). Shoot dry weight, net photosynthesis and relative amounts of N in vacuolar bodies were greater at the higher N and CO2 concentrations. The numbers and areas of vacuolar N-containing bodies were significantly greater at the higher N concentration only at ambient [CO2]. In the same treatment the percentage of hyphae containing glycogen declined to nearly zero. We conclude that, in the high N/low [CO2] treatment, the mycorrhizal fungus had an insufficient carbohydrate supply, partly because of increased amino acid synthesis by the non-mycorrhizal rootlets. When [CO2] was increased, the equilibrium between storage of glycogen and N-containing compounds was reestablished.</AbstractText>
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