The influence of arbuscular mycorrhizae and light on Wisconsin (USA) sand savanna understories 2. Plant competition.
Identifieur interne : 003439 ( Main/Exploration ); précédent : 003438; suivant : 003440The influence of arbuscular mycorrhizae and light on Wisconsin (USA) sand savanna understories 2. Plant competition.
Auteurs : Frank C. Landis [États-Unis] ; Andrea Gargas ; Thomas J. GivnishSource :
- Mycorrhiza [ 0940-6360 ] ; 2005.
Descripteurs français
- KwdFr :
- MESH :
- croissance et développement : Pousses de plante.
- microbiologie : Plantes.
- Biodiversité, Biomasse, Développement des plantes, Lumière, Mycorhizes, Wisconsin.
English descriptors
- KwdEn :
- MESH :
- geographic : Wisconsin.
- growth & development : Plant Shoots.
- microbiology : Plants.
- Biodiversity, Biomass, Light, Mycorrhizae, Plant Development.
Abstract
Wisconsin (USA) oak savannas are endangered plant communities that have remarkably high plant species diversity. To investigate factors underlying this richness, we experimentally investigated the potentially interacting effects of light gradients and arbuscular mycorrhizal fungi (AMF) on plant competition in the greenhouse, using a fully randomized block design. We used four plant species, soil, and AMF from a remnant sand savanna, under two light and five AMF treatments. Plants were grown four per pot under two competition treatments (either one or four species per pot) for 20 weeks. Using ANOVA, we found that all species showed significant treatment effects on total and shoot biomass, primarily due to differences in competition and light, less to AMF. However, effects were the opposite of predictions. Putatively mycorrhizal plants showed neutral to negative responses to AMF, and a nonmycorrhizal species outcompeted AMF species in infected pots. We concluded that our experimental setup of small pots, sandy soil, and long growing period had induced parasitism by the AMF on susceptible hosts. This unexpected result is consistent with field data from the sand savanna, and may help explain how nonmycorrhizal plants can compete successfully with AMF species in established, species-rich communities.
DOI: 10.1007/s00572-005-0366-1
PubMed: 15959812
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<sourceDesc><biblStruct><analytic><title xml:lang="en">The influence of arbuscular mycorrhizae and light on Wisconsin (USA) sand savanna understories 2. Plant competition.</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Biodiversity (MeSH)</term>
<term>Biomass (MeSH)</term>
<term>Light (MeSH)</term>
<term>Mycorrhizae (MeSH)</term>
<term>Plant Development (MeSH)</term>
<term>Plant Shoots (growth & development)</term>
<term>Plants (microbiology)</term>
<term>Wisconsin (MeSH)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Biodiversité (MeSH)</term>
<term>Biomasse (MeSH)</term>
<term>Développement des plantes (MeSH)</term>
<term>Lumière (MeSH)</term>
<term>Mycorhizes (MeSH)</term>
<term>Plantes (microbiologie)</term>
<term>Pousses de plante (croissance et développement)</term>
<term>Wisconsin (MeSH)</term>
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<keywords scheme="MESH" type="geographic" xml:lang="en"><term>Wisconsin</term>
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<keywords scheme="MESH" qualifier="croissance et développement" xml:lang="fr"><term>Pousses de plante</term>
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<keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Plant Shoots</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>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Biodiversity</term>
<term>Biomass</term>
<term>Light</term>
<term>Mycorrhizae</term>
<term>Plant Development</term>
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<keywords scheme="MESH" xml:lang="fr"><term>Biodiversité</term>
<term>Biomasse</term>
<term>Développement des plantes</term>
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<front><div type="abstract" xml:lang="en">Wisconsin (USA) oak savannas are endangered plant communities that have remarkably high plant species diversity. To investigate factors underlying this richness, we experimentally investigated the potentially interacting effects of light gradients and arbuscular mycorrhizal fungi (AMF) on plant competition in the greenhouse, using a fully randomized block design. We used four plant species, soil, and AMF from a remnant sand savanna, under two light and five AMF treatments. Plants were grown four per pot under two competition treatments (either one or four species per pot) for 20 weeks. Using ANOVA, we found that all species showed significant treatment effects on total and shoot biomass, primarily due to differences in competition and light, less to AMF. However, effects were the opposite of predictions. Putatively mycorrhizal plants showed neutral to negative responses to AMF, and a nonmycorrhizal species outcompeted AMF species in infected pots. We concluded that our experimental setup of small pots, sandy soil, and long growing period had induced parasitism by the AMF on susceptible hosts. This unexpected result is consistent with field data from the sand savanna, and may help explain how nonmycorrhizal plants can compete successfully with AMF species in established, species-rich communities.</div>
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<Abstract><AbstractText>Wisconsin (USA) oak savannas are endangered plant communities that have remarkably high plant species diversity. To investigate factors underlying this richness, we experimentally investigated the potentially interacting effects of light gradients and arbuscular mycorrhizal fungi (AMF) on plant competition in the greenhouse, using a fully randomized block design. We used four plant species, soil, and AMF from a remnant sand savanna, under two light and five AMF treatments. Plants were grown four per pot under two competition treatments (either one or four species per pot) for 20 weeks. Using ANOVA, we found that all species showed significant treatment effects on total and shoot biomass, primarily due to differences in competition and light, less to AMF. However, effects were the opposite of predictions. Putatively mycorrhizal plants showed neutral to negative responses to AMF, and a nonmycorrhizal species outcompeted AMF species in infected pots. We concluded that our experimental setup of small pots, sandy soil, and long growing period had induced parasitism by the AMF on susceptible hosts. This unexpected result is consistent with field data from the sand savanna, and may help explain how nonmycorrhizal plants can compete successfully with AMF species in established, species-rich communities.</AbstractText>
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