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2023
Journal article
Molecular phylogenetics of Maranta (Marantaceae: Zingiberales): non-monophyly and support for a wider circumscription.
Neotropical Maranta has repeatedly emerged as non-monophyletic in molecular phylogenetic studies, but no taxonomic changes have been proposed due to previous weak support for the main clades and overall sparse taxonomic sampling. Our study includes a phylogenetic hypothesis strictly based on molecular evidence, using nuclear ribosomal (nrITS) and plastid (rps16,... -
2021
Journal article
Nuclear–plastid discordance indicates past introgression in Epidendrum species (Laeliinae: Orchidaceae) with highly variable chromosome numbers.
Here we study a challenging group of karyotypically highly variable Epidendrum spp. using phylogenetic methods to help understand how hybridization/introgression contributes to karyotype evolution. We hypothesize that species with great chromosome number variation are a result of past hybridization/introgression. Conflicting topologies in trees constructed using separate plastid and nuclear datasets... -
2022
Journal article
Repeat dynamics across timescales: a perspective from sibling allotetraploid marsh orchids (Dactylorhiza majalis s.l.).
To provide insights into the fate of transposable elements (TEs) across timescales in a post-polyploidization context, we comparatively investigate five sibling Dactylorhiza allotetraploids (Orchidaceae) formed independently and sequentially between 500 and 100K generations ago by unidirectional hybridisation between diploids D. fuchsii and D. incarnata. Our results first reveal that the...Eriksson, Mimmi C. ; Mandáková, Terezie ; McCann, Jamie ; Temsch, Eva M. ; Chase, Mark W …
Transposable elements, Genomic shock, Allopolyploidy, Marsh orchids, Dactylorhiza majalis, and Genome size
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2021
Journal article
Chromosome numbers and heterochromatin variation in introgressed and non-introgressed populations of Epidendrum (Orchidaceae: Epidendroideae): interspecific transfers of heterochromatin lead to divergent variable karyotypes in the parental populations.
Some groups in Epidendrum have stable chromosome numbers, whereas the species of Epidendrum subgenus Amphiglottium exhibit high levels of chromosome number variability and other genomic alterations. Polyploidy and dysploidy have both been invoked to explain chromosome number variation in the subgenus, but little is known about what is driving the...Nollet, Felipe ; Medeiros Neto, Enoque ; Cordeiro, Joel M P ; Buril, Maria Teresa ; Chase, Mark W …
Heterochromatin, Polyploidy, Hybridization, Chromosome banding, and Dysploidy
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2020
Journal article
Extensive plastid-nuclear discordance in a recent radiation of Nicotiana section Suaveolentes (Solanaceae)
Nicotiana section Suaveolentes is the largest section of Nicotiana and is a monophyletic group of allotetraploid species. Most of the species are endemic to Australia, but three species occur on islands in the South Pacific as far east as French Polynesia and one species is native to Namibia. Here, we... -
2021
Journal article
The role of Quaternary glaciations in shaping biogeographic patterns in a recently evolved clade of South American epiphytic orchids.
To contribute to what is known about involvement of vegetation dynamics in Neotropical speciation, we used the Epidendrum latilabre complex, a taxonomically well-defined species group, to investigate past connections between Amazonian (AM) and Atlantic (AF) forests and address the following topics: (1) divergence times between sister species currently distributed in... -
2021
Journal article
Biogeography and genome size evolution of the oldest extant vascular plant genus, Equisetum (Equisetaceae)
Abstract Background and Aims Extant plant groups with a long fossil history are key elements in understanding vascular plant evolution. Horsetails (Equisetum, Equisetaceae) have a nearly continuous fossil record dating back to the Carboniferous, but their phylogenetic and biogeographic patterns are still poorly understood. We use here the most extensive...Christenhusz, Maarten J M ; Chase, Mark W ; Fay, Michael F ; Hidalgo, Oriane ; Leitch, Ilia J …
living fossils, sperm cells, flagellae, molecular clocks, Sphenophyta, ferns, horsetails, and C-value
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2020
Journal article
Rapid diversification rates in Amazonian Chrysobalanaceae inferred from plastid genome phylogenetics
We studied the evolutionary history of Chrysobalanaceae with phylogenetic analyses of complete plastid genomes from 156 species to assess the tempo of diversification in the Neotropics and help to unravel the causes of Amazonian plant diversification. These plastid genomes had a mean length of 162 204 base pairs, and the...Chave, Jerome ; Sothers, Cynthia ; Iribar, Amaia ; Suescun, Uxue ; Chase, Mark W …
tropical forest, phylogenetic inference, Amazonia, Malpighiales, and molecular dating
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2019
Journal article
Phylogenomic Relationships of Diploids and the Origins of Allotetraploids in Dactylorhiza (Orchidaceae)
Disentangling phylogenetic relationships proves challenging for groups that have evolved recently, especially if there is ongoing reticulation. Although they are in most cases immediately isolated from diploid relatives, sets of sibling allopolyploids often hybridize with each other, thereby increasing the complexity of an already challenging situation. Dactylorhiza (Orchidaceae: Orchidinae) is...Brandrud, Marie K ; Baar, Juliane ; Lorenzo, Maria T ; Athanasiadis, Alexander ; Bateman, Richard M …