Symbiont abundance can affect host plant population dynamics.
Identifieur interne : 000E08 ( Main/Corpus ); précédent : 000E07; suivant : 000E09Symbiont abundance can affect host plant population dynamics.
Auteurs : Rachel Rock-Blake ; Melissa K. Mccormick ; Hope E A. Brooks ; Cynthia S. Jones ; Dennis F. WhighamSource :
- American journal of botany [ 1537-2197 ] ; 2017.
English descriptors
- KwdEn :
- Basidiomycota (classification), Basidiomycota (genetics), Basidiomycota (physiology), DNA, Fungal (chemistry), DNA, Fungal (genetics), Hyphae (genetics), Hyphae (physiology), Mycorrhizae (classification), Mycorrhizae (genetics), Mycorrhizae (physiology), Orchidaceae (microbiology), Orchidaceae (physiology), Phylogeny (MeSH), Plant Dormancy (MeSH), Plant Roots (microbiology), Sequence Analysis, DNA (MeSH), Soil Microbiology (MeSH), Species Specificity (MeSH), Symbiosis (physiology).
- MESH :
- chemical , chemistry : DNA, Fungal.
- classification : Basidiomycota, Mycorrhizae.
- genetics : Basidiomycota, DNA, Fungal, Hyphae, Mycorrhizae.
- microbiology : Orchidaceae, Plant Roots.
- physiology : Basidiomycota, Hyphae, Mycorrhizae, Orchidaceae, Symbiosis.
- Phylogeny, Plant Dormancy, Sequence Analysis, DNA, Soil Microbiology, Species Specificity.
Abstract
PREMISE OF THE STUDY
Symbioses are almost universal, but little is known about how symbiont abundance can affect host performance. Many orchids undergo vegetative dormancy and frequent and protracted dormancy have been associated with population declines. If mycorrhizal fungi affect host plant performance, those effects are likely to alter patterns of vegetative dormancy. The goal of this study was to determine whether the abundance of mycorrhizal fungi is related to the likelihood of entering dormancy and whether fungal abundance varied with dormancy duration in the federally listed threatened orchid Isotria medeoloides.
METHODS
We studied three populations of the threatened North American terrestrial orchid Isotria medeoloides using long-term emergence data and evaluated the relationship between the abundance of associated mycorrhizal fungi (Russulaceae) and orchid dormancy and emergence. Mycorrhizal fungi in soil adjacent to orchids were quantified in two ways. First, ectomycorrhizal (ECM) fungi on adjacent root tips were identified using DNA sequencing to determine their phylogenetic relationship to fungi that are known to form mycorrhizae with I. medeoloides. Second, we extracted DNA from soil samples and used quantitative real-time PCR to estimate the abundance of Russulaceae hyphae adjacent to each orchid.
KEY RESULTS
We found that the abundance of Russulaceae, both in the soil and on nearby ECM root tips, was significantly related to orchid prior emergence. Both abundance and prior emergence history were predictive of future emergence.
CONCLUSIONS
These results suggest that the abundance of mycorrhizal fungi can influence orchid population dynamics and is an essential component of orchid conservation.
DOI: 10.3732/ajb.1600334
PubMed: 28062407
Links to Exploration step
pubmed:28062407Le document en format XML
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<author><name sortKey="Rock Blake, Rachel" sort="Rock Blake, Rachel" uniqKey="Rock Blake R" first="Rachel" last="Rock-Blake">Rachel Rock-Blake</name>
<affiliation><nlm:affiliation>Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, Connecticut 06269-3043 USA.</nlm:affiliation>
</affiliation>
</author>
<author><name sortKey="Mccormick, Melissa K" sort="Mccormick, Melissa K" uniqKey="Mccormick M" first="Melissa K" last="Mccormick">Melissa K. Mccormick</name>
<affiliation><nlm:affiliation>Smithsonian Environmental Research Center, P. O. Box 28, Edgewater, Maryland 21037 USA mccormickm@si.edu.</nlm:affiliation>
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<author><name sortKey="Brooks, Hope E A" sort="Brooks, Hope E A" uniqKey="Brooks H" first="Hope E A" last="Brooks">Hope E A. Brooks</name>
<affiliation><nlm:affiliation>Smithsonian Environmental Research Center, P. O. Box 28, Edgewater, Maryland 21037 USA.</nlm:affiliation>
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<author><name sortKey="Jones, Cynthia S" sort="Jones, Cynthia S" uniqKey="Jones C" first="Cynthia S" last="Jones">Cynthia S. Jones</name>
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<author><name sortKey="Whigham, Dennis F" sort="Whigham, Dennis F" uniqKey="Whigham D" first="Dennis F" last="Whigham">Dennis F. Whigham</name>
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<author><name sortKey="Brooks, Hope E A" sort="Brooks, Hope E A" uniqKey="Brooks H" first="Hope E A" last="Brooks">Hope E A. Brooks</name>
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<author><name sortKey="Whigham, Dennis F" sort="Whigham, Dennis F" uniqKey="Whigham D" first="Dennis F" last="Whigham">Dennis F. Whigham</name>
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<series><title level="j">American journal of botany</title>
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<term>Basidiomycota (physiology)</term>
<term>DNA, Fungal (chemistry)</term>
<term>DNA, Fungal (genetics)</term>
<term>Hyphae (genetics)</term>
<term>Hyphae (physiology)</term>
<term>Mycorrhizae (classification)</term>
<term>Mycorrhizae (genetics)</term>
<term>Mycorrhizae (physiology)</term>
<term>Orchidaceae (microbiology)</term>
<term>Orchidaceae (physiology)</term>
<term>Phylogeny (MeSH)</term>
<term>Plant Dormancy (MeSH)</term>
<term>Plant Roots (microbiology)</term>
<term>Sequence Analysis, DNA (MeSH)</term>
<term>Soil Microbiology (MeSH)</term>
<term>Species Specificity (MeSH)</term>
<term>Symbiosis (physiology)</term>
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<keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>DNA, Fungal</term>
</keywords>
<keywords scheme="MESH" qualifier="classification" xml:lang="en"><term>Basidiomycota</term>
<term>Mycorrhizae</term>
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<keywords scheme="MESH" qualifier="genetics" xml:lang="en"><term>Basidiomycota</term>
<term>DNA, Fungal</term>
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<term>Mycorrhizae</term>
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<term>Plant Roots</term>
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<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Basidiomycota</term>
<term>Hyphae</term>
<term>Mycorrhizae</term>
<term>Orchidaceae</term>
<term>Symbiosis</term>
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<keywords scheme="MESH" xml:lang="en"><term>Phylogeny</term>
<term>Plant Dormancy</term>
<term>Sequence Analysis, DNA</term>
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<front><div type="abstract" xml:lang="en"><p><b>PREMISE OF THE STUDY</b>
</p>
<p>Symbioses are almost universal, but little is known about how symbiont abundance can affect host performance. Many orchids undergo vegetative dormancy and frequent and protracted dormancy have been associated with population declines. If mycorrhizal fungi affect host plant performance, those effects are likely to alter patterns of vegetative dormancy. The goal of this study was to determine whether the abundance of mycorrhizal fungi is related to the likelihood of entering dormancy and whether fungal abundance varied with dormancy duration in the federally listed threatened orchid Isotria medeoloides.</p>
</div>
<div type="abstract" xml:lang="en"><p><b>METHODS</b>
</p>
<p>We studied three populations of the threatened North American terrestrial orchid Isotria medeoloides using long-term emergence data and evaluated the relationship between the abundance of associated mycorrhizal fungi (Russulaceae) and orchid dormancy and emergence. Mycorrhizal fungi in soil adjacent to orchids were quantified in two ways. First, ectomycorrhizal (ECM) fungi on adjacent root tips were identified using DNA sequencing to determine their phylogenetic relationship to fungi that are known to form mycorrhizae with I. medeoloides. Second, we extracted DNA from soil samples and used quantitative real-time PCR to estimate the abundance of Russulaceae hyphae adjacent to each orchid.</p>
</div>
<div type="abstract" xml:lang="en"><p><b>KEY RESULTS</b>
</p>
<p>We found that the abundance of Russulaceae, both in the soil and on nearby ECM root tips, was significantly related to orchid prior emergence. Both abundance and prior emergence history were predictive of future emergence.</p>
</div>
<div type="abstract" xml:lang="en"><p><b>CONCLUSIONS</b>
</p>
<p>These results suggest that the abundance of mycorrhizal fungi can influence orchid population dynamics and is an essential component of orchid conservation.</p>
</div>
</front>
</TEI>
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<Abstract><AbstractText Label="PREMISE OF THE STUDY" NlmCategory="OBJECTIVE">Symbioses are almost universal, but little is known about how symbiont abundance can affect host performance. Many orchids undergo vegetative dormancy and frequent and protracted dormancy have been associated with population declines. If mycorrhizal fungi affect host plant performance, those effects are likely to alter patterns of vegetative dormancy. The goal of this study was to determine whether the abundance of mycorrhizal fungi is related to the likelihood of entering dormancy and whether fungal abundance varied with dormancy duration in the federally listed threatened orchid Isotria medeoloides.</AbstractText>
<AbstractText Label="METHODS" NlmCategory="METHODS">We studied three populations of the threatened North American terrestrial orchid Isotria medeoloides using long-term emergence data and evaluated the relationship between the abundance of associated mycorrhizal fungi (Russulaceae) and orchid dormancy and emergence. Mycorrhizal fungi in soil adjacent to orchids were quantified in two ways. First, ectomycorrhizal (ECM) fungi on adjacent root tips were identified using DNA sequencing to determine their phylogenetic relationship to fungi that are known to form mycorrhizae with I. medeoloides. Second, we extracted DNA from soil samples and used quantitative real-time PCR to estimate the abundance of Russulaceae hyphae adjacent to each orchid.</AbstractText>
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<CopyrightInformation>© 2017 Botanical Society of America.</CopyrightInformation>
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