Soil feedback of exotic savanna grass relates to pathogen absence and mycorrhizal selectivity.
Identifieur interne : 002E72 ( Main/Exploration ); précédent : 002E71; suivant : 002E73Soil feedback of exotic savanna grass relates to pathogen absence and mycorrhizal selectivity.
Auteurs : W H Van Der Putten [Pays-Bas] ; G A Kowalchuk ; E P Brinkman ; G T A. Doodeman ; R M Van Der Kaaij ; A F D. Kamp ; F B J. Menting ; E M VeenendaalSource :
- Ecology [ 0012-9658 ] ; 2007.
Descripteurs français
- KwdFr :
- ADN fongique (analyse), ADN ribosomique (analyse), Biodiversité (MeSH), Botswana (MeSH), Microbiologie du sol (MeSH), Mycorhizes (classification), Mycorhizes (croissance et développement), Mycorhizes (physiologie), Poaceae (croissance et développement), Poaceae (microbiologie), Racines de plante (microbiologie), Réaction de polymérisation en chaîne (méthodes), Spécificité d'espèce (MeSH), Écosystème (MeSH), Électrophorèse sur gel d'agar (méthodes).
- MESH :
- analyse : ADN fongique, ADN ribosomique.
- croissance et développement : Mycorhizes, Poaceae.
- microbiologie : Poaceae, Racines de plante.
- méthodes : Réaction de polymérisation en chaîne, Électrophorèse sur gel d'agar.
- physiologie : Mycorhizes.
- Biodiversité, Botswana, Microbiologie du sol, Mycorhizes, Spécificité d'espèce, Écosystème.
- Wicri :
- geographic : Botswana.
English descriptors
- KwdEn :
- Biodiversity (MeSH), Botswana (MeSH), DNA, Fungal (analysis), DNA, Ribosomal (analysis), Ecosystem (MeSH), Electrophoresis, Agar Gel (methods), Mycorrhizae (classification), Mycorrhizae (growth & development), Mycorrhizae (physiology), Plant Roots (microbiology), Poaceae (growth & development), Poaceae (microbiology), Polymerase Chain Reaction (methods), Soil Microbiology (MeSH), Species Specificity (MeSH).
- MESH :
- chemical , analysis : DNA, Fungal, DNA, Ribosomal.
- geographic : Botswana.
- classification : Mycorrhizae.
- growth & development : Mycorrhizae, Poaceae.
- methods : Electrophoresis, Agar Gel, Polymerase Chain Reaction.
- microbiology : Plant Roots, Poaceae.
- physiology : Mycorrhizae.
- Biodiversity, Ecosystem, Soil Microbiology, Species Specificity.
Abstract
Enemy release of exotic plants from soil pathogens has been tested by examining plant-soil feedback effects in repetitive growth cycles. However, positive soil feedback may also be due to enhanced benefit from the local arbuscular mycorrhizal fungi (AMF). Few studies actually have tested pathogen effects, and none of them did so in arid savannas. In the Kalahari savanna in Botswana, we compared the soil feedback of the exotic grass Cenchrus biflorus with that of two dominant native grasses, Eragrostis lehmanniana and Aristida meridionalis. The exotic grass had neutral to positive soil feedback, whereas both native grasses showed neutral to negative feedback effects. Isolation and testing of root-inhabiting fungi of E. lehmanniana yielded two host-specific pathogens that did not influence the exotic C. biflorus or the other native grass, A. meridionalis. None of the grasses was affected by the fungi that were isolated from the roots of the exotic C. biflorus. We isolated and compared the AMF community of the native and exotic grasses by polymerase chain reaction-denaturing gradient gel elecrophoresis (PCR-DGGE), targeting AMF 18S rRNA. We used roots from monospecific field stands and from plants grown in pots with mixtures of soils from the monospecific field stands. Three-quarters of the root samples of the exotic grass had two nearly identical sequences, showing 99% similarity with Glomus versiforme. The two native grasses were also associated with distinct bands, but each of these bands occurred in only a fraction of the root samples. The native grasses contained a higher diversity of AMF bands than the exotic grass. Canonical correspondence analyses of the AMF band patterns revealed almost as much difference between the native and exotic grasses as between the native grasses. In conclusion, our results support the hypothesis that release from soil-borne enemies may facilitate local abundance of exotic plants, and we provide the first evidence that these processes may occur in arid savanna ecosystems. Pathogenicity tests implicated the involvement of soil pathogens in the soil feedback responses, and further studies should reveal the functional consequences of the observed high infection with a low diversity of AMF in the roots of exotic plants.
DOI: 10.1890/06-1051
PubMed: 17536713
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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<term>Botswana (MeSH)</term>
<term>DNA, Fungal (analysis)</term>
<term>DNA, Ribosomal (analysis)</term>
<term>Ecosystem (MeSH)</term>
<term>Electrophoresis, Agar Gel (methods)</term>
<term>Mycorrhizae (classification)</term>
<term>Mycorrhizae (growth & development)</term>
<term>Mycorrhizae (physiology)</term>
<term>Plant Roots (microbiology)</term>
<term>Poaceae (growth & development)</term>
<term>Poaceae (microbiology)</term>
<term>Polymerase Chain Reaction (methods)</term>
<term>Soil Microbiology (MeSH)</term>
<term>Species Specificity (MeSH)</term>
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<term>ADN ribosomique (analyse)</term>
<term>Biodiversité (MeSH)</term>
<term>Botswana (MeSH)</term>
<term>Microbiologie du sol (MeSH)</term>
<term>Mycorhizes (classification)</term>
<term>Mycorhizes (croissance et développement)</term>
<term>Mycorhizes (physiologie)</term>
<term>Poaceae (croissance et développement)</term>
<term>Poaceae (microbiologie)</term>
<term>Racines de plante (microbiologie)</term>
<term>Réaction de polymérisation en chaîne (méthodes)</term>
<term>Spécificité d'espèce (MeSH)</term>
<term>Écosystème (MeSH)</term>
<term>Électrophorèse sur gel d'agar (méthodes)</term>
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<term>Racines de plante</term>
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<term>Poaceae</term>
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<term>Électrophorèse sur gel d'agar</term>
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<front><div type="abstract" xml:lang="en">Enemy release of exotic plants from soil pathogens has been tested by examining plant-soil feedback effects in repetitive growth cycles. However, positive soil feedback may also be due to enhanced benefit from the local arbuscular mycorrhizal fungi (AMF). Few studies actually have tested pathogen effects, and none of them did so in arid savannas. In the Kalahari savanna in Botswana, we compared the soil feedback of the exotic grass Cenchrus biflorus with that of two dominant native grasses, Eragrostis lehmanniana and Aristida meridionalis. The exotic grass had neutral to positive soil feedback, whereas both native grasses showed neutral to negative feedback effects. Isolation and testing of root-inhabiting fungi of E. lehmanniana yielded two host-specific pathogens that did not influence the exotic C. biflorus or the other native grass, A. meridionalis. None of the grasses was affected by the fungi that were isolated from the roots of the exotic C. biflorus. We isolated and compared the AMF community of the native and exotic grasses by polymerase chain reaction-denaturing gradient gel elecrophoresis (PCR-DGGE), targeting AMF 18S rRNA. We used roots from monospecific field stands and from plants grown in pots with mixtures of soils from the monospecific field stands. Three-quarters of the root samples of the exotic grass had two nearly identical sequences, showing 99% similarity with Glomus versiforme. The two native grasses were also associated with distinct bands, but each of these bands occurred in only a fraction of the root samples. The native grasses contained a higher diversity of AMF bands than the exotic grass. Canonical correspondence analyses of the AMF band patterns revealed almost as much difference between the native and exotic grasses as between the native grasses. In conclusion, our results support the hypothesis that release from soil-borne enemies may facilitate local abundance of exotic plants, and we provide the first evidence that these processes may occur in arid savanna ecosystems. Pathogenicity tests implicated the involvement of soil pathogens in the soil feedback responses, and further studies should reveal the functional consequences of the observed high infection with a low diversity of AMF in the roots of exotic plants.</div>
</front>
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<Abstract><AbstractText>Enemy release of exotic plants from soil pathogens has been tested by examining plant-soil feedback effects in repetitive growth cycles. However, positive soil feedback may also be due to enhanced benefit from the local arbuscular mycorrhizal fungi (AMF). Few studies actually have tested pathogen effects, and none of them did so in arid savannas. In the Kalahari savanna in Botswana, we compared the soil feedback of the exotic grass Cenchrus biflorus with that of two dominant native grasses, Eragrostis lehmanniana and Aristida meridionalis. The exotic grass had neutral to positive soil feedback, whereas both native grasses showed neutral to negative feedback effects. Isolation and testing of root-inhabiting fungi of E. lehmanniana yielded two host-specific pathogens that did not influence the exotic C. biflorus or the other native grass, A. meridionalis. None of the grasses was affected by the fungi that were isolated from the roots of the exotic C. biflorus. We isolated and compared the AMF community of the native and exotic grasses by polymerase chain reaction-denaturing gradient gel elecrophoresis (PCR-DGGE), targeting AMF 18S rRNA. We used roots from monospecific field stands and from plants grown in pots with mixtures of soils from the monospecific field stands. Three-quarters of the root samples of the exotic grass had two nearly identical sequences, showing 99% similarity with Glomus versiforme. The two native grasses were also associated with distinct bands, but each of these bands occurred in only a fraction of the root samples. The native grasses contained a higher diversity of AMF bands than the exotic grass. Canonical correspondence analyses of the AMF band patterns revealed almost as much difference between the native and exotic grasses as between the native grasses. In conclusion, our results support the hypothesis that release from soil-borne enemies may facilitate local abundance of exotic plants, and we provide the first evidence that these processes may occur in arid savanna ecosystems. Pathogenicity tests implicated the involvement of soil pathogens in the soil feedback responses, and further studies should reveal the functional consequences of the observed high infection with a low diversity of AMF in the roots of exotic plants.</AbstractText>
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<ForeName>W H</ForeName>
<Initials>WH</Initials>
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