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Symbiont abundance can affect host plant population dynamics

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dc.contributor.author Rock-Blake, Rachel en
dc.contributor.author McCormick, Melissa K. en
dc.contributor.author Brooks, Hope E. A. en
dc.contributor.author Jones, Cynthia S. en
dc.contributor.author Whigham, Dennis F. en
dc.date.accessioned 2017-02-14T20:56:01Z
dc.date.available 2017-02-14T20:56:01Z
dc.date.issued 2017
dc.identifier.citation Rock-Blake, Rachel, McCormick, Melissa K., Brooks, Hope E. A., Jones, Cynthia S., and Whigham, Dennis F. 2017. "<a href="https://repository.si.edu/handle/10088/30708">Symbiont abundance can affect host plant population dynamics</a>." <em>American Journal of Botany</em>. 104 (1):72&ndash;82. <a href="https://doi.org/10.3732/ajb.1600334">https://doi.org/10.3732/ajb.1600334</a> en
dc.identifier.issn 0002-9122
dc.identifier.uri https://hdl.handle.net/10088/30708
dc.description.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. en
dc.relation.ispartof American Journal of Botany en
dc.title Symbiont abundance can affect host plant population dynamics en
dc.type Journal Article en
dc.identifier.srbnumber 141499
dc.identifier.doi 10.3732/ajb.1600334
rft.jtitle American Journal of Botany
rft.volume 104
rft.issue 1
rft.spage 72
rft.epage 82
dc.description.SIUnit SERC en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 72
dc.citation.epage 82

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