Effect of P availability on temporal dynamics of carbon allocation and glomus intraradices high-affinity P transporter gene induction in arbuscular mycorrhiza.
Identifieur interne : 003306 ( Main/Exploration ); précédent : 003305; suivant : 003307Effect of P availability on temporal dynamics of carbon allocation and glomus intraradices high-affinity P transporter gene induction in arbuscular mycorrhiza.
Auteurs : P L Axel Olsson [Suède] ; Maria C. Hansson ; Stephen H. BurleighSource :
- Applied and environmental microbiology [ 0099-2240 ] ; 2006.
Descripteurs français
- KwdFr :
- MESH :
- analyse : Lipides.
- croissance et développement : Racines de plante.
- isolement et purification : Mycorhizes.
- microbiologie : Plantes.
- métabolisme : Carbone, Mycorhizes, Phospholipides, Racines de plante.
- Biomasse, Cinétique.
English descriptors
- KwdEn :
- MESH :
- chemical , analysis : Lipids.
- chemical , metabolism : Carbon, Phospholipids.
- growth & development : Plant Roots.
- isolation & purification : Mycorrhizae.
- metabolism : Mycorrhizae, Plant Roots.
- microbiology : Plants.
- Biomass, Kinetics.
Abstract
Arbuscular mycorrhizal (AM) fungi depend on a C supply from the plant host and simultaneously provide phosphorus to the colonized plant. We therefore evaluated the influence of external P on C allocation in monoxenic Daucus carota-Glomus intraradices cultures in an AM symbiosis. Fungal hyphae proliferated from a solid minimal medium containing colonized roots into a C-free liquid minimal medium with high or low P availability. Roots and hyphae were harvested periodically, and the flow of C from roots to fungus was measured by isotope labeling. We also measured induction of a G. intraradices high-affinity P transporter to estimate fungal P demand. The prevailing hypothesis is that high P availability reduces mycorrhizal fungal growth, but we found that C flow to the fungus was initially highest at the high P level. Only at later harvests, after 100 days of in vitro culture, were C flow and fungal growth limited at high P availability. Thus, AM fungi can benefit initially from P-enriched environments in terms of plant C allocation. As expected, the P transporter induction was significantly greater at low P availability and greatest in very young mycelia. We found no direct link between C flow to the fungus and the P transporter transcription level, which indicates that a good C supply is not essential for induction of the high-affinity P transporter. We describe a mechanism by which P regulates symbiotic C allocation, and we discuss how this mechanism may have evolved in a competitive environment.
DOI: 10.1128/AEM.02154-05
PubMed: 16751522
PubMed Central: PMC1489668
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Biomass (MeSH)</term>
<term>Carbon (metabolism)</term>
<term>Kinetics (MeSH)</term>
<term>Lipids (analysis)</term>
<term>Mycorrhizae (isolation & purification)</term>
<term>Mycorrhizae (metabolism)</term>
<term>Phospholipids (metabolism)</term>
<term>Plant Roots (growth & development)</term>
<term>Plant Roots (metabolism)</term>
<term>Plants (microbiology)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Biomasse (MeSH)</term>
<term>Carbone (métabolisme)</term>
<term>Cinétique (MeSH)</term>
<term>Lipides (analyse)</term>
<term>Mycorhizes (isolement et purification)</term>
<term>Mycorhizes (métabolisme)</term>
<term>Phospholipides (métabolisme)</term>
<term>Plantes (microbiologie)</term>
<term>Racines de plante (croissance et développement)</term>
<term>Racines de plante (métabolisme)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>Lipids</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Carbon</term>
<term>Phospholipids</term>
</keywords>
<keywords scheme="MESH" qualifier="analyse" xml:lang="fr"><term>Lipides</term>
</keywords>
<keywords scheme="MESH" qualifier="croissance et développement" xml:lang="fr"><term>Racines de plante</term>
</keywords>
<keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Plant Roots</term>
</keywords>
<keywords scheme="MESH" qualifier="isolation & purification" xml:lang="en"><term>Mycorrhizae</term>
</keywords>
<keywords scheme="MESH" qualifier="isolement et purification" xml:lang="fr"><term>Mycorhizes</term>
</keywords>
<keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Mycorrhizae</term>
<term>Plant Roots</term>
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<keywords scheme="MESH" qualifier="microbiologie" xml:lang="fr"><term>Plantes</term>
</keywords>
<keywords scheme="MESH" qualifier="microbiology" xml:lang="en"><term>Plants</term>
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<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Carbone</term>
<term>Mycorhizes</term>
<term>Phospholipides</term>
<term>Racines de plante</term>
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<keywords scheme="MESH" xml:lang="en"><term>Biomass</term>
<term>Kinetics</term>
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<front><div type="abstract" xml:lang="en">Arbuscular mycorrhizal (AM) fungi depend on a C supply from the plant host and simultaneously provide phosphorus to the colonized plant. We therefore evaluated the influence of external P on C allocation in monoxenic Daucus carota-Glomus intraradices cultures in an AM symbiosis. Fungal hyphae proliferated from a solid minimal medium containing colonized roots into a C-free liquid minimal medium with high or low P availability. Roots and hyphae were harvested periodically, and the flow of C from roots to fungus was measured by isotope labeling. We also measured induction of a G. intraradices high-affinity P transporter to estimate fungal P demand. The prevailing hypothesis is that high P availability reduces mycorrhizal fungal growth, but we found that C flow to the fungus was initially highest at the high P level. Only at later harvests, after 100 days of in vitro culture, were C flow and fungal growth limited at high P availability. Thus, AM fungi can benefit initially from P-enriched environments in terms of plant C allocation. As expected, the P transporter induction was significantly greater at low P availability and greatest in very young mycelia. We found no direct link between C flow to the fungus and the P transporter transcription level, which indicates that a good C supply is not essential for induction of the high-affinity P transporter. We describe a mechanism by which P regulates symbiotic C allocation, and we discuss how this mechanism may have evolved in a competitive environment.</div>
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<Abstract><AbstractText>Arbuscular mycorrhizal (AM) fungi depend on a C supply from the plant host and simultaneously provide phosphorus to the colonized plant. We therefore evaluated the influence of external P on C allocation in monoxenic Daucus carota-Glomus intraradices cultures in an AM symbiosis. Fungal hyphae proliferated from a solid minimal medium containing colonized roots into a C-free liquid minimal medium with high or low P availability. Roots and hyphae were harvested periodically, and the flow of C from roots to fungus was measured by isotope labeling. We also measured induction of a G. intraradices high-affinity P transporter to estimate fungal P demand. The prevailing hypothesis is that high P availability reduces mycorrhizal fungal growth, but we found that C flow to the fungus was initially highest at the high P level. Only at later harvests, after 100 days of in vitro culture, were C flow and fungal growth limited at high P availability. Thus, AM fungi can benefit initially from P-enriched environments in terms of plant C allocation. As expected, the P transporter induction was significantly greater at low P availability and greatest in very young mycelia. We found no direct link between C flow to the fungus and the P transporter transcription level, which indicates that a good C supply is not essential for induction of the high-affinity P transporter. We describe a mechanism by which P regulates symbiotic C allocation, and we discuss how this mechanism may have evolved in a competitive environment.</AbstractText>
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