The impact of extinct taxa on understanding the early evolution of Angiosperm clades: an example incorporating fossil reproductive structures of Saxifragales

Hermsen, Elizabeth J.; Nixon, Kevin C.; Crepet, William L.

doi:10.1007/s00606-006-0441-x

Cited by 35 publications

(22 citation statements)

References 89 publications

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“…Peridiscaceae are not only notable in their transoceanic disjunction but also for inhabiting regions and biomes (i.e., wet, tropical rainforests) that are otherwise rare in Saxifragales. Given the age of Saxifragales (Hermsen et al, 2006; Jian et al, 2008), this trans‐Atlantic disjunction may be due to ancient vicariance, rather than more recent long‐distance dispersal from Africa to South America.…”

Section: Discussionmentioning

confidence: 99%

Malpighiales phylogenetics: Gaining ground on one of the most recalcitrant clades in the angiosperm tree of life

Wurdack

Davis

2009

American J of Botany

302

266

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The eudicot order Malpighiales contains ∼16000 species and is the most poorly resolved large rosid clade. To clarify phylogenetic relationships in the order, we used maximum likelihood, Bayesian, and parsimony analyses of DNA sequence data from 13 gene regions, totaling 15604 bp, and representing all three genomic compartments (i.e., plastid: atpB, matK, ndhF, and rbcL; mitochondrial: ccmB, cob, matR, nad1B-C, nad6, and rps3; and nuclear: 18S rDNA, PHYC, and newly developed low-copy EMB2765). Our sampling of 190 taxa includes representatives from all families of Malpighiales. These data provide greatly increased support for the recent additions of Aneulophus, Bhesa, Centroplacus, Ploiarium, and Rafflesiaceae to Malpighiales; sister relations of Phyllanthaceae + Picrodendraceae, monophyly of Hypericaceae, and polyphyly of Clusiaceae. Oxalidales + Huaceae, followed by Celastrales are successive sisters to Malpighiales. Parasitic Rafflesiaceae, which produce the world's largest flowers, are confirmed as embedded within a paraphyletic Euphorbiaceae. Novel findings show a well-supported placement of Ctenolophonaceae with Erythroxylaceae + Rhizophoraceae, sister-group relationships of Bhesa + Centroplacus, and the exclusion of Medusandra from Malpighiales. New taxonomic circumscriptions include the addition of Bhesa to Centroplacaceae, Medusandra to Peridiscaceae (Saxifragales), Calophyllaceae applied to Clusiaceae subfamily Kielmeyeroideae, Peraceae applied to Euphorbiaceae subfamily Peroideae, and Huaceae included in Oxalidales.

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Section: Discussionmentioning

confidence: 99%

Malpighiales phylogenetics: Gaining ground on one of the most recalcitrant clades in the angiosperm tree of life

Wurdack

Davis

2009

American J of Botany

302

266

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“…For all approaches we used the same fossil constraints. The best well-documented fossils to use for Micranthes are in closely related families outside Saxifragaceae, including fossilized leaves of Ribes webbii in Grossulariaceae (Hermsen, 2005), Itea fossil pollen in Iteaceae (Hermsen, 2013), and fossils of Divisestylus in the Saxifragaceae alliance (Hermsen et al, 2006;Hermsen, 2013). Fossils were applied following the placements suggested in previous dating analyses of Saxifragaceae (Ebersbach et al, 2016;Stubbs et al, 2018;Folk et al, 2019).…”

Section: Molecular Datingmentioning

confidence: 99%

A Phylogenomic Perspective on Evolution and Discordance in the Alpine-Arctic Plant Clade Micranthes (Saxifragaceae)

et al. 2020

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The increased availability of large phylogenomic datasets is often accompanied by difficulties in disentangling and harnessing the data. These difficulties may be enhanced for species resulting from reticulate evolution and/or rapid radiations producing largescale discordance. As a result, there is a need for methods to investigate discordance, and in turn, use this conflict to inform and aid in downstream analyses. Therefore, we drew upon multiple analytical tools to investigate the evolution of Micranthes (Saxifragaceae), a clade of primarily arctic-alpine herbs impacted by reticulate and rapid radiations. To elucidate the evolution of Micranthes we sought near-complete taxon sampling with multiple accessions per species and assembled extensive nuclear (518 putatively single copy loci) and plastid (95 loci) datasets. In addition to a robust phylogeny for Micranthes, this research shows that genetic discordance presents a valuable opportunity to develop hypotheses about its underlying causes, such as hybridization, polyploidization, and range shifts. Specifically, we present a multi-step approach that incorporates multiple checks points for paralogy, including reciprocally blasting targeted genes against transcriptomes, running paralogy checks during the assembly step, and grouping genes into gene families to look for duplications. We demonstrate that a thorough assessment of discordance can be a source of evidence for evolutionary processes that were not adequately captured by a bifurcating tree model, and helped to clarify processes that have structured the evolution of Micranthes.

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“…Divisestylus was hypothesized to form a clade with Itea L. and Choristylis Harv. of Iteaceae and Pterostemon Schauer of Pterostemonaceae, as supported by the shared presence of fused stigmas (Hermsen et al ., ; Hermsen, Nixon & Crepet, ). Based on this fossil, we calibrated the stem age of the Iteaceae–Pterostemonaceae clade using a mean age of the fossil as 91.4 Ma with the standard error of 1.0 to roughly match the fossil age of 89.3–93.5 Ma.…”

Section: Methodsmentioning

confidence: 99%

Molecular phylogeny and biogeography ofAstilbe(Saxifragaceae) in Asia and eastern North America

et al. 2012

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Phylogenetic analyses were conducted for Astilbe (Saxifragaceae), an Asian/eastern North American disjunct genus, using sequences of nuclear ribosomal internal transcribed spacer (ITS) and plastid matK, trnL‐trnF and psbA‐trnH regions. The monophyly of Astilbe is well supported by both ITS and plastid sequences. Topological incongruence was detected between the plastid and the ITS trees, particularly concerning the placement of the single North American species, A. biternata, which may be most probably explained by its origin involving hybridization and/or allopolyploidy with plastid capture. In Astilbe, all species with hermaphroditic flowers constitute a well‐supported clade; dioecious species form a basal grade to the hermaphroditic clade. Astilbe was estimated to have split with Saxifragopsis from western North America at 20.69 Ma (95% HPD: 12.14–30.22 Ma) in the early Miocene. This intercontinental disjunction between Astilbe and Saxifragopsis most likely occurred via the Bering land bridge. The major clade of Astilbe (all species of the genus excluding A. platyphylla) was inferred to have a continental Asian origin. At least three subsequent migrations or dispersals were hypothesized to explain the expansion of Astilbe into North America, Japan and tropical Asian islands. The intercontinental disjunct lineage in Astilbe invokes a hybridization event either in eastern Asia or in North America. This disjunction in Astilbe may be explained by a Beringian migration around 3.54 Ma (95% high posterior density: 1.29–6.18 Ma) in the late Tertiary, although long‐distance dispersal from eastern Asia to North America is also likely. The biogeographical connection between continental Asia, Taiwan, the Philippines and other tropical Asian islands in Astilbe provides evidence for the close floristic affinity between temperate or alpine south‐western China and tropical Asia. © 2012 The Linnean Society of London, Botanical Journal of the Linnean Society, 2012, ●●, ●●–●●.

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The impact of extinct taxa on understanding the early evolution of Angiosperm clades: an example incorporating fossil reproductive structures of Saxifragales

Cited by 35 publications

References 89 publications

Malpighiales phylogenetics: Gaining ground on one of the most recalcitrant clades in the angiosperm tree of life

Malpighiales phylogenetics: Gaining ground on one of the most recalcitrant clades in the angiosperm tree of life

A Phylogenomic Perspective on Evolution and Discordance in the Alpine-Arctic Plant Clade Micranthes (Saxifragaceae)

Molecular phylogeny and biogeography ofAstilbe(Saxifragaceae) in Asia and eastern North America

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