Differentiation of Diploid and Triploid Taxa within Taraxacum sect. Erythrosperma (Asteraceae) from the Pannonian Region

@article{uvada2011DifferentiationOD,
  title={Differentiation of Diploid and Triploid Taxa within Taraxacum sect. Erythrosperma (Asteraceae) from the Pannonian Region},
  author={R{\'o}bert {\vS}uvada and Pavol M{\'a}rtonfi and Lenka M{\'a}rtonfiov{\'a}},
  journal={Folia Geobotanica},
  year={2011},
  volume={47},
  pages={69-91}
}
Six taxa of the genus Taraxacum sect. Erythrosperma were analyzed morphometrically using multivariate methods. A total of 391 specimens from Slovakia, Hungary, Czech Republic and Austria were studied. This study aimed to explore if leaf shape can be used to differentiate diploids and triploids, to verify if triploid microspecies deserve separate taxonomic status, and if the diploid plants can be divided into phenotype groups. The analysis of leaf-shape variability revealed no notable difference… 
Differentiation of the taxa of the genus Taraxacum sect. Erythrosperma on the basis of morphological characters on achenes and outer bracts
TLDR
Morphometric analyses with employment of multivariate statistic methods in the sample of 745 achenes and 447 outer bracts showed no substantial differences in the studied characters between diploid Taraxacum erythrospermum and triploids.
Comparison of breeding behaviour of Taraxacum sect. Ruderalia and Taraxacum sect. Erythrosperma (Asteraceae )
All three basic breeding systems - allogamy, autogamy and apomixis are found in the genus Taraxacum . Most Taraxacum sections combine both sexual and asexulal way of reproduction. Two of these
Genotypic diversity of apomictic microspecies of the Taraxacum scanicum group (Taraxacum sect. Erythrosperma)
TLDR
This study investigated genotypic diversity among seven apomictic microspecies coexisting in Central Europe using microsatellites, amplified fragment length polymorphism and chloroplast DNA markers, and showed that despite their increased genetic diversity, apomic dandelions form definable clusters that may be characterised by both molecular markers and morphology.
How apomictic taxa are treated in current taxonomy: A review
TLDR
This review aims to provide an overview of the main characteristics of “apomictic genera” and the approaches used to treat apomixis taxa within these genera and the authors’ view on important points, which need to be taken into account in the classification of apomic taxa.
Niche divergence contributes to geographical parthenogenesis in two dandelion taxa
  • P. Meirmans
  • Environmental Science
    Journal of evolutionary biology
  • 2021
TLDR
Differences in niche optima, niche determinants, and niche width all contribute to the pattern of geographical parthenogenesis of these two dandelion taxa, however, the results also indicate that the exact causation of geographicalParthenogenesis is not uniform across taxa.
Testing Hybridization Hypotheses with Morphometry: The Case of Eastern American Arctic Species of Potentilla sect. Niveae (Rosaceae)
TLDR
Morphological evidence appears to give support to the hybridization hypothesis both between Potentillas arenosa and Potentilla nivea and betweenPotentilla werenosa andpotentilla vahliana sensu lato, although other explanations may also be conceivable.
Taraxacum sect. Erythrosperma in Slovakia. Part I. Addenda to distribution of Taraxacum cristatum
New distribution data of Taraxacum cristatum (T. scanicum group), described in the year 2005, in Slovakia were recorded. During the intensive study of Slovak dandelions in herbarium collections and
Flow cytometric seed screen data are consistent with models of chromosome inheritance in asymmetrically compensating allopolyploids
TLDR
This study highlights the precision of flow cytometry in determining DNA content and it's utility in screening reproduction modes and advocates for more in‐depth investigations into rapid screening of accessions where the Pind ratio has deviated from the 1.5 value typical of sexual species, which may indicate meiotic irregularities.

References

SHOWING 1-10 OF 60 REFERENCES
Taraxacum sect. Erythrosperma in Moravia (Czech Republic): Taxonomic notes and the distribution of previously described species
TLDR
Dandelions (Taraxacum) of the section Erythrosperma were studied in Moravia, Czech Republic, where both sexual diploid and apomictic polyploid species occur and only seven were identified as previously described species.
DNA markers and morphometry reveal multiclonal and poorly defined taxa in an apomictic Cotoneaster species complex
TLDR
Morphometric analyses of leaf shape and DNA marker analysis with RAPD were applied to investigate the differentiation between these two tetraploid species, and determine whether two morphologically aberrant variants of C. scandinavicus deserve taxonomic recognition.
Reticulate evolution and taxonomic concepts in the Ranunculus auricomus complex (Ranunculaceae): insights from analysis of morphological, karyological and molecular data.
TLDR
The Ranunculus auricomus complex is tried to elucidate the evolution of apomictic "cassubicus" morphotypes and a separate classification of the sexual species, R. notabilis and the closely related species pair R. cassubicifolius and R. carpaticola is proposed.
Studies in Crataegus (Rosaceae, Maloideae), XV. Patterns of Morphometric Variation in Crataegus series Rotundifoliae in Ontario
TLDR
It is suggested that the facultative nature of apomixis in series Rotundifoliae militates against the maintenance of a large number of rather uniform apomictic forms.
Breeding behavior and its possible consequences for gene flow in Taraxacum sect. Erythrosperma (H. Lindb.) Dahlst.
TLDR
The present study supports the agamospecies concept of Taraxacum sect.
Possible pathways of the gene flow inTaraxacum sect.Ruderalia
TLDR
Diploid maternal plants when experimentally crossed with triploid pollen donors produced diploids and polyploid progeny, while when pollinated with a mixture of the pollen of diploid and triploids or insect pollinated, no polyploids were discovered.
Two new apomictic Taraxacum microspecies of the section Erythrosperma from central Europe
TLDR
Two new species, Taraxacum maricum and Tarxacum cristatum, of the section Erythrosperma from Central Europe are described and both are triploid apomictic microspecies.
Taraxacum prunicolor sp. nova, a new species of the Taraxacum scanicum group (sect. Erythrosperma).
A Central European population of Taraxacum that had been previously determined as T. scanicumDahlst. were recognized to be different from those originally described from Sweden. T. scanicum s. str.
Taraxacum princeps sp. nova, a new species of section Erythrosperma from Central Europe
TLDR
A new Taraxacum microspecies of section Erythrosperma, TaraxACum princeps, is described here, which is a triploid apomict which is distributed in SE part of Central Europe and its nomenclature is discussed.
Clonality as a part of the evolution process inTaraxacum
TLDR
Agamospermy is shown to significantly reduce recombination processes; it should not be considered an absolute evolutionary “blind alley”.
...
...