The intergeneric hybrid grass “Poa labradorica”

Cayouette, Jacques; Darbyshire, Stephen J.

doi:10.1111/j.1756-1051.1993.tb00106.x

Cited by 7 publications

(7 citation statements)

References 29 publications

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“…The intergeneric hybrid genus ÂDupoa (=Dupontia Â Poa) includes a well documented sterile clonal hybrid between Poa (subg. Arctopoa) eminens and D. fisheri that occurs in northern Quebec-Labrador (Cayouette and Darbyshire 1993). Although Dupontia itself is suspected to be of hybrid origin, neither Cayouette and Darbyshire (1993) nor Byrsting et al (2004) …”

Section: Reticulate Evolutionmentioning

confidence: 96%

Phylogenetic relationships in subtribe Poinae (Poaceae, Poeae) based on nuclear ITS and plastidtrnT–trnL–trnF sequencesThis paper is one of a selection of papers published in the Special Issue on Systematics Research.

Gillespie

Soreng

Bull

et al. 2008

Botany

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The worldwide temperate subtribe Poinae comprises the largest grass genus, Poa (500+ species), and multiple additional small genera. We explore generic boundaries and relationships among genera of Poinae using nuclear ribosomal internal transcribed spacer data (ITS) and plastid trnT-trnL-trnF (TLF) sequence data. ITS and TLF analyses are mostly congruent with regards to circumscription of genera, and with respect to relationships among Poinae genera, but tree structure is generally better supported among genera in the ITS strict consensus tree. ITS and TLF both support two main Poinae lineages: (i) Poa and (ii) a clade comprising all other sampled Poinae. Nine small genera were nested within the large Poa clade, including Aphanelytrum, Dissanthelium, and Tovarochloa, supporting inclusion of these as sections within Poa. In the second clade, three subclades support close relationships among Nicoraepoa, Hookerochloa, and Arctagrostis; Arctophila and Dupontia; and Apera, Bellardiochloa, and Ventenata. Genera of the related subtribes Alopecurinae, Cinninae, and Miliinae were mixed among or in part external to Poinae in different ways in ITS and TLF analyses, and only subtribe Puccinelliinae was strongly supported and monophyletic. ITS analyses supported placement of Catabrosella, Hyalopoa, and Paracolpodium in Puccinelliinae (no TLF data available). The position of Poa subgenus Arctopoa is incongruent between the two analyses: TLF data support inclusion within Poa and ITS data place it outside of Poa. Similarly, TLF data resolves the genus Aniselytron outside of Poa, whereas ITS data place it within Poa. Based on these results and a consideration of morphology, we recognize Arctopoa and Aniselytron as genera, probably of ancient hybrid origins. Nothogenus ÂDuarctopoa is coined for Arctopoa Â Dupontia, with a single nothospecies ÂDuarctopoa labradorica. A new combination is provided for Poa subg. Sylvestres. Résumé: La sous-tribu des régions tempérées mondiales des Poinae comporte les Poa, le plus grand genre d'herbes avec plus de 500 espèces, ainsi que de multiples petits genres additionnels. Les auteurs ont exploré les limites génériques et les relations au sein des Poinae, en utilisant les données de l'espaceur interne transcrit de l'ADN ribosomique nucléique (ITS) et les données de séquences plastidiques trnT-trnL-trnF (TFL). Les analyses ITS et TFL concordent généralement quant à la circonscription des genres et aux relations entre les genres de Poinae, mais le dendrogramme des genres est générale-ment mieux supporté dans l'arbre ITS à strict consensus. Les ITF et les TFL supportent tous les deux, deux lignées principales de Poinae: (i) Poa et (ii) un clade comportant tous les autres échantillons de Poinae. Neuf petits genres se retrouvent au sein du grand clade Poa, incluant Aphanelytrum, Dissanthelium et Tovarochloa, supportant leur regroupement dans une section les Poa. Dans le second clade, trois sous clades supportent d'étroites relations entre Nicoraepoa, Hookerochloa et Arctagrostis; Arctophila et Dupontia...

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Section: Reticulate Evolutionmentioning

confidence: 96%

Phylogenetic relationships in subtribe Poinae (Poaceae, Poeae) based on nuclear ITS and plastidtrnT–trnL–trnF sequencesThis paper is one of a selection of papers published in the Special Issue on Systematics Research.

Gillespie

Soreng

Bull

et al. 2008

Botany

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“…& Darbysh. ; Cayouette & Darbyshire, 1993;. Using DNA sequence data Brysting et al (2004) showed that Dupontia together with Arctophila was sister to Arctagrostis, but phylogenetically isolated from Deschampsia s.s. or s.l.…”

Section: Chromosomes In Dadmentioning

confidence: 99%

Molecular and morphological evidence for a new grass genus, Dupontiopsis (Poaceae tribe Poeae subtribe Poinae s.l.), endemic to alpine Japan, and implications for the reticulate origin of Dupontia and Arctophila within Poinae s.l.

Soreng

Gillespie

Koba

et al. 2015

J of Sytematics Evolution

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Phylogenetic analyses within Poaceae tribe Poeae subtribes Puccinellinae (=Coleanthinae), Phleinae, Poinae s.l. (including Alopecurinae), and Miliinae (PPAM clade), revealed that one species formerly placed in Poa represents a new monotypic genus belonging to subtribe Poinae s.l., Dupontiopsis gen. nov., D. hayachinensis comb. nov. (based on Poa hayachinensis), endemic to wet, gravelly, serpentine, alpine habitats in northern Japan. This genus forms a strongly supported clade (DAD) with two circumarctic Poinae genera, Arctophila and Dupontia, in phylogenetic analyses of plastid and nuclear ribosomal DNA sequence data. Both morphology and DNA sequence analyses provide support for D. hayachinensis as a lineage distinct from either Arctophila or Dupontia, with moderate DNA support for a position as sister to these two genera. Dupontiopsis resembles these other monotypic genera in its several‐flowered spikelets, lemmas usually 3‐nerved, with frequently awned attenuate scarious apices (as in Dupontia) and calluses with a crown of hairs around the base of the lemma, but differs in its keeled lemmas, scabrous palea keels, glumes shorter than the first lemma. Our investigation suggests that the most recent shared ancestor of the DAD clade evolved from a single hybridization event, as a hexaploid, probably in western Beringia. The probable parentage of the ancestor is considered to be within the Poinae–Alopecurinae clade excluding Poa. We provide evidence for possible secondary hybridization and introgression of duodecaploid Dupontia fisheri with Puccinellia. A key to perennial genera of PPAM with hairy calluses, and a supplemental table of morphological characters in the genera accepted in PPAM are provided.

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“…In the work by Darbyshire & al. (1992) and Cayouette & Darbyshire (1993), Poa eminens and Dupontia fisheri were pointed out as parental species of the intergeneric hybrid ×Dupoa labradorica (Steudel) J. Cayouette & S. J. Darbyshire. This example represents an early stage of evolution of a hybrid in which the chances of detecting both parents are greater than at a later stage as might be the case in Dupontia.…”

Section: The Possible Intergeneric Hybrid Origin Ofmentioning

confidence: 99%

One or more species in the arctic grass genus Dupontia? – a contribution to the Panarctic Flora project

Brysting

Fay

Leitch

et al. 2004

TAXON

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The grass family (Poaceae) is the largest family of vascular plants in the Arctic. The family includes several species complexes that show high ploidy levels, predominantly reproduce asexually, are poorly morphologically delimited, and have a possible origin within the Arctic area by reticulate evolution. Challenged by work on the Panarctic Flora project and apparent discrepancies in recent taxonomic treatments, we investigated the arctic grass genus Dupontia by molecular and cytogenetic methods. Identical plastid DNA (trnL–F) sequences and very similar AFLP profiles indicated that Dupontia and Arctophila are closely related and that the latter might have been involved in a possible intergeneric hybrid origin of Dupontia. Despite the presence of intraindividual rDNA (ITS) variation in Dupontia indicating an allopolyploid hybrid origin of the genus, it was not possible to predict the second parental species from sequence data or from fluorescent in situ hybridization (FISH) experiments using genomic probes. Due to lack of sequence divergence within Dupontia, AFLP fingerprinting was applied to investigate whether any genetic subdivision exists within the genus. The data sorted Dupontia first of all according to geography and not to ploidy or morphological characters that have previously been used to discriminate between proposed taxa. The results indicate that the recognition of a single polymorphic species is the best solution for the genus Dupontia.

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The intergeneric hybrid grass “Poa labradorica”

Cited by 7 publications

References 29 publications

Phylogenetic relationships in subtribe Poinae (Poaceae, Poeae) based on nuclear ITS and plastidtrnT–trnL–trnF sequencesThis paper is one of a selection of papers published in the Special Issue on Systematics Research.

Phylogenetic relationships in subtribe Poinae (Poaceae, Poeae) based on nuclear ITS and plastidtrnT–trnL–trnF sequencesThis paper is one of a selection of papers published in the Special Issue on Systematics Research.

Molecular and morphological evidence for a new grass genus, Dupontiopsis (Poaceae tribe Poeae subtribe Poinae s.l.), endemic to alpine Japan, and implications for the reticulate origin of Dupontia and Arctophila within Poinae s.l.

One or more species in the arctic grass genus Dupontia? – a contribution to the Panarctic Flora project

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