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[PMID]: | 27539600 |
[Au] Autor: | Schneider AC; Colwell AE; Schneeweiss GM; Baldwin BG |
[Ad] Endereço: | Department of Integrative Biology, 1005 Valley Life Sciences Building, University of California, Berkeley, CA 94720, USA Jepson Herbarium, 1001 Valley Life Sciences Building, University of California, Berkeley, CA 94720, USA acschneider@berkeley.edu. |
[Ti] Título: | Cryptic host-specific diversity among western hemisphere broomrapes (Orobanche s.l., Orobanchaceae). |
[So] Source: | Ann Bot;118(6):1101-1111, 2016 Nov. | [Is] ISSN: | 1095-8290 |
[Cp] País de publicação: | England |
[La] Idioma: | eng |
[Ab] Resumo: | BACKGROUND AND AIMS: The broomrapes, Orobanche sensu lato (Orobanchaceae), are common root parasites found across Eurasia, Africa and the Americas. All species native to the western hemisphere, recognized as Orobanche sections Gymnocaulis and Nothaphyllon, form a clade that has a centre of diversity in western North America, but also includes four disjunct species in central and southern South America. The wide ecological distribution coupled with moderate taxonomic diversity make this clade a valuable model system for studying the role, if any, of host-switching in driving the diversification of plant parasites. METHODS: Two spacer regions of ribosomal nuclear DNA (ITS + ETS), three plastid regions and one low-copy nuclear gene were sampled from 163 exemplars of Orobanche from across the native geographic range in order to infer a detailed phylogeny. Together with comprehensive data on the parasites' native host ranges, associations between phylogenetic lineages and host specificity are tested. KEY RESULTS: Within the two currently recognized species of O. sect. Gymnocaulis, seven strongly supported clades were found. While commonly sympatric, members of these clades each had unique host associations. Strong support for cryptic host-specific diversity was also found in sect. Nothaphyllon, while other taxonomic species were well supported. We also find strong evidence for multiple amphitropical dispersals from central North America into South America. CONCLUSIONS: Host-switching is an important driver of diversification in western hemisphere broomrapes, where host specificity has been grossly underestimated. More broadly, host specificity and host-switching probably play fundamental roles in the speciation of parasitic plants. |
[Mh] Termos MeSH primário: |
Orobanche/fisiologia
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[Mh] Termos MeSH secundário: |
Biodiversidade América Central DNA de Plantas/genética DNA Espaçador Ribossômico/genética Ecologia América do Norte Orobanche/genética Filogenia Plastídeos/genética Alinhamento de Sequência Análise de Sequência de DNA América do Sul
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[Pt] Tipo de publicação: | JOURNAL ARTICLE |
[Nm] Nome de substância:
| 0 (DNA, Plant); 0 (DNA, Ribosomal Spacer) |
[Em] Mês de entrada: | 1708 |
[Cu] Atualização por classe: | 171101 |
[Lr] Data última revisão:
| 171101 |
[Sb] Subgrupo de revista: | IM |
[Da] Data de entrada para processamento: | 160820 |
[St] Status: | MEDLINE |
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