Gene flow between alien and native races of the holoparasitic angiosperm Orobanche minor (Orobanchaceae)

The holoparasitic angiosperm Orobanche minor parasitizes a diverse range of flowering plants from at least 16 orders in both the monocots and eudicots. However, populations of O. minor show host specificity at a local level. Our previous work identified the potential for host specificity to act as a...

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Main Authors: Thorogood, C, Rumsey, F, Harris, S, Hiscock, S
Format: Journal article
Language:English
Published: 2009
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author Thorogood, C
Rumsey, F
Harris, S
Hiscock, S
author_facet Thorogood, C
Rumsey, F
Harris, S
Hiscock, S
author_sort Thorogood, C
collection OXFORD
description The holoparasitic angiosperm Orobanche minor parasitizes a diverse range of flowering plants from at least 16 orders in both the monocots and eudicots. However, populations of O. minor show host specificity at a local level. Our previous work identified the potential for host specificity to act as a catalyst for genetic divergence among populations of O. minor. Here we have extended this investigation by sampling populations from multiple hosts, across a broad geographic range. Sequence characterised amplified region (SCAR) data identified an exotic host-generalist lineage and a native host-specialist lineage of O. minor, suggesting genetic structure in this species is defined by both host specificity and geography. In addition, host-range overlap, discordant tree topologies, and cryptic morphology indicate the presence of gene flow between alien races and endemic populations. Therefore, repeated introductions of alien races of O. minor from disparate sources leading to introgression with native populations, and cryptic race formation, seem to have contributed to the taxonomic confusion associated with this species. We speculate that radiations associated with broad host range and divergent host ecologies may have promoted the unusually wide geographic distribution and diversification of this species. Finally, evidence of multiple shifts to exotic hosts, coupled with the predicted northward shift in climatic suitability, identify the potential for range expansion in alien races of O. minor, which may threaten nationally scarce native taxa with genetic assimilation. Our phylogenetic analysis provides a framework for identifying host races in Orobanche with a view to setting conservation priorities. © Springer-Verlag 2009.
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spelling oxford-uuid:0c603e31-8ed1-4800-90b8-37be656eae4c2022-03-26T09:34:40ZGene flow between alien and native races of the holoparasitic angiosperm Orobanche minor (Orobanchaceae)Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:0c603e31-8ed1-4800-90b8-37be656eae4cEnglishSymplectic Elements at Oxford2009Thorogood, CRumsey, FHarris, SHiscock, SThe holoparasitic angiosperm Orobanche minor parasitizes a diverse range of flowering plants from at least 16 orders in both the monocots and eudicots. However, populations of O. minor show host specificity at a local level. Our previous work identified the potential for host specificity to act as a catalyst for genetic divergence among populations of O. minor. Here we have extended this investigation by sampling populations from multiple hosts, across a broad geographic range. Sequence characterised amplified region (SCAR) data identified an exotic host-generalist lineage and a native host-specialist lineage of O. minor, suggesting genetic structure in this species is defined by both host specificity and geography. In addition, host-range overlap, discordant tree topologies, and cryptic morphology indicate the presence of gene flow between alien races and endemic populations. Therefore, repeated introductions of alien races of O. minor from disparate sources leading to introgression with native populations, and cryptic race formation, seem to have contributed to the taxonomic confusion associated with this species. We speculate that radiations associated with broad host range and divergent host ecologies may have promoted the unusually wide geographic distribution and diversification of this species. Finally, evidence of multiple shifts to exotic hosts, coupled with the predicted northward shift in climatic suitability, identify the potential for range expansion in alien races of O. minor, which may threaten nationally scarce native taxa with genetic assimilation. Our phylogenetic analysis provides a framework for identifying host races in Orobanche with a view to setting conservation priorities. © Springer-Verlag 2009.
spellingShingle Thorogood, C
Rumsey, F
Harris, S
Hiscock, S
Gene flow between alien and native races of the holoparasitic angiosperm Orobanche minor (Orobanchaceae)
title Gene flow between alien and native races of the holoparasitic angiosperm Orobanche minor (Orobanchaceae)
title_full Gene flow between alien and native races of the holoparasitic angiosperm Orobanche minor (Orobanchaceae)
title_fullStr Gene flow between alien and native races of the holoparasitic angiosperm Orobanche minor (Orobanchaceae)
title_full_unstemmed Gene flow between alien and native races of the holoparasitic angiosperm Orobanche minor (Orobanchaceae)
title_short Gene flow between alien and native races of the holoparasitic angiosperm Orobanche minor (Orobanchaceae)
title_sort gene flow between alien and native races of the holoparasitic angiosperm orobanche minor orobanchaceae
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AT harriss geneflowbetweenalienandnativeracesoftheholoparasiticangiospermorobancheminororobanchaceae
AT hiscocks geneflowbetweenalienandnativeracesoftheholoparasiticangiospermorobancheminororobanchaceae