Common mycorrhizal networks amplify size inequality in Andropogon gerardii monocultures.
Identifieur interne : 001D71 ( Main/Exploration ); précédent : 001D70; suivant : 001D72Common mycorrhizal networks amplify size inequality in Andropogon gerardii monocultures.
Auteurs : Joanna Weremijewicz [États-Unis] ; David P. JanosSource :
- The New phytologist [ 1469-8137 ] ; 2013.
Descripteurs français
- KwdFr :
- Analyse de variance (MeSH), Analyse en composantes principales (MeSH), Andropogon (anatomie et histologie), Andropogon (croissance et développement), Andropogon (microbiologie), Biomasse (MeSH), Feuilles de plante (microbiologie), Feuilles de plante (métabolisme), Germination (MeSH), Mycorhizes (croissance et développement), Mycorhizes (physiologie), Numération de colonies microbiennes (MeSH), Plant (croissance et développement), Plant (microbiologie), Sol (MeSH).
- MESH :
- anatomie et histologie : Andropogon.
- croissance et développement : Andropogon, Mycorhizes, Plant.
- microbiologie : Andropogon, Feuilles de plante, Plant.
- métabolisme : Feuilles de plante.
- physiologie : Mycorhizes.
- Analyse de variance, Analyse en composantes principales, Biomasse, Germination, Numération de colonies microbiennes, Sol.
English descriptors
- KwdEn :
- Analysis of Variance (MeSH), Andropogon (anatomy & histology), Andropogon (growth & development), Andropogon (microbiology), Biomass (MeSH), Colony Count, Microbial (MeSH), Germination (MeSH), Mycorrhizae (growth & development), Mycorrhizae (physiology), Plant Leaves (metabolism), Plant Leaves (microbiology), Principal Component Analysis (MeSH), Seedlings (growth & development), Seedlings (microbiology), Soil (MeSH).
- MESH :
- chemical : Soil.
- anatomy & histology : Andropogon.
- growth & development : Andropogon, Mycorrhizae, Seedlings.
- metabolism : Plant Leaves.
- microbiology : Andropogon, Plant Leaves, Seedlings.
- physiology : Mycorrhizae.
- Analysis of Variance, Biomass, Colony Count, Microbial, Germination, Principal Component Analysis.
Abstract
Arbuscular mycorrhizal fungi can interconnect plant root systems through hyphal common mycorrhizal networks, which may influence the distribution of limiting mineral nutrients among interconnected individuals, potentially affecting competition and consequent size inequality. Using a microcosm model system, we investigated whether the members of Andropogon gerardii monocultures compete via common mycorrhizal networks. We grew A. gerardii seedlings with isolated root systems in individual, adjacent containers while preventing, disrupting or allowing common mycorrhizal networks among them. Fertile soil was placed within the containers, which were embedded within infertile sand. We assessed mycorrhizas, leaf tissue mineral nutrient concentrations, size hierarchies and the growth of nearest neighbors. Plants interconnected by common mycorrhizal networks had 8% greater colonized root length, 12% higher phosphorus and 35% higher manganese concentrations than plants severed from common mycorrhizal networks. Interconnected plants were, on average, 15% larger and had 32% greater size inequality, as reflected by Gini coefficients, than those with severed connections. Only with intact common mycorrhizal networks were whole-plant dry weights negatively associated with those of their neighbors. In the absence of root system overlap, common mycorrhizal networks likely promote asymmetric competition below ground, thereby exaggerating size inequality within A. gerardii populations.
DOI: 10.1111/nph.12125
PubMed: 23356215
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Andropogon (croissance et développement)</term>
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<front><div type="abstract" xml:lang="en">Arbuscular mycorrhizal fungi can interconnect plant root systems through hyphal common mycorrhizal networks, which may influence the distribution of limiting mineral nutrients among interconnected individuals, potentially affecting competition and consequent size inequality. Using a microcosm model system, we investigated whether the members of Andropogon gerardii monocultures compete via common mycorrhizal networks. We grew A. gerardii seedlings with isolated root systems in individual, adjacent containers while preventing, disrupting or allowing common mycorrhizal networks among them. Fertile soil was placed within the containers, which were embedded within infertile sand. We assessed mycorrhizas, leaf tissue mineral nutrient concentrations, size hierarchies and the growth of nearest neighbors. Plants interconnected by common mycorrhizal networks had 8% greater colonized root length, 12% higher phosphorus and 35% higher manganese concentrations than plants severed from common mycorrhizal networks. Interconnected plants were, on average, 15% larger and had 32% greater size inequality, as reflected by Gini coefficients, than those with severed connections. Only with intact common mycorrhizal networks were whole-plant dry weights negatively associated with those of their neighbors. In the absence of root system overlap, common mycorrhizal networks likely promote asymmetric competition below ground, thereby exaggerating size inequality within A. gerardii populations.</div>
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