Phylogeny of the Paniceae (Poaceae: Panicoideae): integrating plastid DNA sequences and morphology into a new classification (project)

Abstract Gilliesieae are a South American tribe of Amaryllidaceae characterized by high floral diversity. Given different taxonomic interpretations and proposals for generic and specific relationships, a representative phylogenetic analysis is required to clarify the systematics of this group. The present study provides a framework for understanding phylogenetic relationships and contributing to the development of an appropriate taxonomic treatment of Gilliesieae. Molecular analyses, based on nuclear (ITS) and plastid DNA sequences (trnL-F and rbcL), resolve with strong support the monophyly of the tribe and the differentiation of two major clades. Clade I comprises the genera Gilliesia, Gethyum and Solaria and Clade II includes Miersia and Speea. These well-supported clades are mostly congruent with vegetative and karyotype characters rather than, e.g., floral symmetry. At the generic level, all molecular analyses reveal the paraphyly of Gilliesia and Miersia. Gethyum was found to be paraphyletic, resulting in the confirmation of Ancrumia as a distinct genus. Several instances of incongruent phylogenetic signals were found among data sets. The calibrated tree suggests a recent diversification of the tribe (Pliocene–Pleistocene), a contemporary process of speciation in which instances of hybridization and incomplete lineage sorting could explain patterns of paraphyly and incongruence of floral morphology.

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A Phylogenetic Analysis of Loasaceae Subfamily Loasoideae Based on Plastid DNA Sequences

International Journal of Plant Sciences ◽

10.1086/427477 ◽

2005 ◽

Vol 166 (2) ◽

pp. 289-300 ◽

Cited By ~ 12

Author(s):

Larry Hufford ◽

Michelle M. McMahon ◽

Robin O’Quinn ◽

Muriel E. Poston

Keyword(s):

Phylogenetic Analysis ◽

Dna Sequences ◽

Plastid Dna

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Jumping through the hoops: the challenges of daffodil (Narcissus) classification

Botanical Journal of the Linnean Society ◽

10.1093/botlinnean/boz032 ◽

2019 ◽

Vol 190 (4) ◽

pp. 389-404 ◽

Cited By ~ 2

Author(s):

Kálmán Könyves ◽

John David ◽

Alastair Culham

Keyword(s):

Dna Sequences ◽

Phylogenetic Trees ◽

Plastid Dna ◽

Microsatellite Data ◽

Population Sampling ◽

Molecular Phylogenetic ◽

History Of ◽

Nuclear Microsatellite ◽

Congruent Group ◽

First Time

Abstract Hoop-petticoat daffodils are a morphologically congruent group comprised of two distinct lineages in molecular phylogenetic trees of Narcissus. It is possible that the morphological similarity is a product of both historic and current low-level gene flow between these lineages. For the first time, we report population sampling from across the entire range of distribution covering the Iberian Peninsula and Morocco. In total, 455 samples were collected from 59 populations. Plastid DNA sequences of matK and ndhF were generated alongside 11 microsatellite loci to permit comparison between plastid and nuclear lineage histories. The plastid DNA phylogenetic tree was highly congruent with previous molecular studies and supported the recognition of these two lineages of hoop-petticoat daffodils as separate sections. Assignment of samples to sections sometimes differed between plastid DNA and (nuclear) microsatellite data. In these cases, the taxa had previously been the focus of dissent in taxonomic placement based on morphology. These discrepancies could be explained by hybridization and introgression among the two lineages during the evolution of hoop-petticoat daffodils, and shows that placement of species in sections is dependent on the source of data used. This study underlines the complex evolutionary history of Narcissus and highlights the discrepancies between floral morphology and phylogeny, which provides a continuing challenge for the systematics of Narcissus.

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Towards a new classification of tribe Stachydeae (Lamiaceae): naming clades using molecular evidence

Botanical Journal of the Linnean Society ◽

10.1093/botlinnean/boz021 ◽

2019 ◽

Vol 190 (4) ◽

pp. 345-358 ◽

Cited By ~ 4

Author(s):

Yasaman Salmaki ◽

Günther Heubl ◽

Maximilian Weigend

Keyword(s):

Ribosomal Dna ◽

Dna Sequences ◽

Phylogenetic Relationships ◽

Nuclear Ribosomal Dna ◽

Molecular Evidence ◽

New Classification ◽

Formal Classification ◽

Phylogenetic Nomenclature

AbstractStachydeae, comprising c. 470 species, are one of the most diverse and taxonomically puzzling groups in Lamioideae. In the present study, the phylogenetic relationships in the Eurystachys clade (a phylogenetic name for all genera attributed to Stachydeae except Melittis) were reconstructed utilizing nuclear ribosomal DNA sequences (nrETS, 5S-NTS) from 148 accessions in 12 genera. Our phylogenetic results recovered Stachys as paraphyletic with numerous traditionally recognized genera nested in it. A broadly defined Eurystachys clade, however, was monophyletic. Unlike previous studies, the present study was able to resolve the group into 12 well-supported clades, named here as (1) Eriostomum, (2) Stachys, (3) Prasium, (4) Setifolia, (5) Distantes, (6) Burgsdorfia, (7) Hesiodia, (8) Empedoclia, (9) Sideritis, (10) Marrubiastrum, (11) Swainsoniana and (12) Olisia. These 12 clades were formally named in a phylogenetic nomenclature for the Eurystachys clade. Several infrageneric units were retrieved as monophyletic, namely Sideritis sections Burgsdorfia, Empedoclia and Hesiodia, Sideritis subgenus Marrubiastrum and Stachys sections Eriostomum (including Stachys section Mucronata) and Setifolia. The findings of this study also provide the basis for a future formal classification, with two options: (1) splitting of the Eurystachys clade into 12 monophyletic genera, all of them based on pre-existing genus names and redefined to encompass additional taxa, but without clear morphological apomorphies; or (2) lumping of all segregates into a broadly defined Stachys, including widely recognized and well-defined segregates such as Prasium and Sideritis.

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Novel Neidium Pfitzer species from western Canada based upon morphology and plastid DNA sequences

Phytotaxa ◽

10.11646/phytotaxa.419.1.3 ◽

2019 ◽

Vol 419 (1) ◽

pp. 39-62 ◽

Cited By ~ 3

Author(s):

PAUL B. HAMILTON ◽

AMANDA M. SAVOIE ◽

CYNTHIA M. SAYRE ◽

OLIVER SKIBBE ◽

JONAS ZIMMERMANN ◽

...

Keyword(s):

Dna Sequences ◽

External Surface ◽

Sequence Data ◽

Lake Victoria ◽

Plastid Dna ◽

Botanical Garden ◽

Western Canada ◽

Nutrient Loads ◽

Small Stream ◽

Stream System

Five taxa in the genus Neidium, N. iridis, N. beatyi sp. nov., N. vandusenense sp. nov., N. collare sp. nov. and N. lavoieanum sp. nov. are documented from a pond and stream system in the VanDusen Botanical Garden, Vancouver, Canada. Neidium beatyi is a large linear species with multiple longitudinal canals and sagittate apices. The areolae are occluded by finger-like silica extensions on the external surface. This taxon is distinguished from Neidium iridis by the number of longitudinal canals (>5), shape of the valve apices, and smaller size. Neidium vandusenense is broadly linear with distinct rostrate apices. Two-three longitudinal canals are present along each margin. Plastid rbcL sequence data associates this taxon with N. amphigomphus. Neidium collare is an elliptic lanceolate taxon with one longitudinal canal. This taxon is genetically related to N. bisculatum sensu lato, but with a different shape form. Neidium lavoieanum has a valve shape form similar to Neidium potapovae, but is larger and genetically similar to N. productum sensu lato. The five Neidium taxa were observed in a small stream next to Lake Victoria (pond) in the VanDusen Botanical Garden Vancouver, Canada. The water was mildly alkaline with a pH of 7.86, a conductance of 163 µS/cm, higher nutrient loads and low metal content.

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