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A Revised Phylogeny of the Mentha spicata Clade Reveals Cryptic Species

The genus Mentha is taxonomically and phylogenetically challenging due to complex genomes, polyploidization and an extensive historical nomenclature, potentially hiding cryptic taxa. A straightforward interpretation of phylogenetic relationships within the section Mentha is further hindered by domin...

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Autores principales: Heylen, Olivier C. G., Debortoli, Nicolas, Marescaux, Jonathan, Olofsson, Jill K.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8074783/
https://www.ncbi.nlm.nih.gov/pubmed/33924227
http://dx.doi.org/10.3390/plants10040819
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author Heylen, Olivier C. G.
Debortoli, Nicolas
Marescaux, Jonathan
Olofsson, Jill K.
author_facet Heylen, Olivier C. G.
Debortoli, Nicolas
Marescaux, Jonathan
Olofsson, Jill K.
author_sort Heylen, Olivier C. G.
collection PubMed
description The genus Mentha is taxonomically and phylogenetically challenging due to complex genomes, polyploidization and an extensive historical nomenclature, potentially hiding cryptic taxa. A straightforward interpretation of phylogenetic relationships within the section Mentha is further hindered by dominant but outdated concepts on historically identified hybrid taxa. Mentha spicata is traditionally considered to be of hybrid origin, but the evidence for this is weak. Here, we aim to understand the phylogenetic relationships within the section Mentha using large sample sizes and to revisit the hybrid status and identity of M. spicata. We show that two of three traditional species in the subsection Spicatae are polyphyletic, as is the subsection as a whole, while the real number of cryptic species was underestimated. Compared to previous studies we present a fundamentally different phylogeny, with a basal split between M. spicata s.s. and M. longifolia s.s. Cluster analyses of morphological and genotypic data demonstrate that there is a dissociation between morphologically and genotypically defined groups of samples. We did not find any evidence that M. spicata is of hybrid origin, and we conclude its taxonomic status should be revised. The combination of genetic and phenotypic information is essential when evaluating hyperdiverse taxonomic groups.
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spelling pubmed-80747832021-04-27 A Revised Phylogeny of the Mentha spicata Clade Reveals Cryptic Species Heylen, Olivier C. G. Debortoli, Nicolas Marescaux, Jonathan Olofsson, Jill K. Plants (Basel) Article The genus Mentha is taxonomically and phylogenetically challenging due to complex genomes, polyploidization and an extensive historical nomenclature, potentially hiding cryptic taxa. A straightforward interpretation of phylogenetic relationships within the section Mentha is further hindered by dominant but outdated concepts on historically identified hybrid taxa. Mentha spicata is traditionally considered to be of hybrid origin, but the evidence for this is weak. Here, we aim to understand the phylogenetic relationships within the section Mentha using large sample sizes and to revisit the hybrid status and identity of M. spicata. We show that two of three traditional species in the subsection Spicatae are polyphyletic, as is the subsection as a whole, while the real number of cryptic species was underestimated. Compared to previous studies we present a fundamentally different phylogeny, with a basal split between M. spicata s.s. and M. longifolia s.s. Cluster analyses of morphological and genotypic data demonstrate that there is a dissociation between morphologically and genotypically defined groups of samples. We did not find any evidence that M. spicata is of hybrid origin, and we conclude its taxonomic status should be revised. The combination of genetic and phenotypic information is essential when evaluating hyperdiverse taxonomic groups. MDPI 2021-04-20 /pmc/articles/PMC8074783/ /pubmed/33924227 http://dx.doi.org/10.3390/plants10040819 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Heylen, Olivier C. G.
Debortoli, Nicolas
Marescaux, Jonathan
Olofsson, Jill K.
A Revised Phylogeny of the Mentha spicata Clade Reveals Cryptic Species
title A Revised Phylogeny of the Mentha spicata Clade Reveals Cryptic Species
title_full A Revised Phylogeny of the Mentha spicata Clade Reveals Cryptic Species
title_fullStr A Revised Phylogeny of the Mentha spicata Clade Reveals Cryptic Species
title_full_unstemmed A Revised Phylogeny of the Mentha spicata Clade Reveals Cryptic Species
title_short A Revised Phylogeny of the Mentha spicata Clade Reveals Cryptic Species
title_sort revised phylogeny of the mentha spicata clade reveals cryptic species
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8074783/
https://www.ncbi.nlm.nih.gov/pubmed/33924227
http://dx.doi.org/10.3390/plants10040819
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