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Katarína Skokanová

Katarína Skokanová
Institute of Botany, Plant Science and Biodiversity Centre, Slovak Academy of Sciences

About

30
Publications
7,534
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272
Citations
Citations since 2016
18 Research Items
230 Citations
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
Introduction

Publications

Publications (30)
Article
A new knotweed hybrid originating from the crossing of Fallopia compacta and F. sachalinensis is described based on plant material collected in the Moravia region in the Czech Republic as F. ×moravica. In addition to the Czech Republic, the hybrid has also been reported previously from the United Kingdom and New Zealand; however, it was not disting...
Article
Full-text available
Spatial segregation of cytotypes reduces the negative effect of frequency-dependent mating on the fitness of minority cytotype(s) and thus allows its establishment and coexistence with the majority cytotype in mixed-ploidy populations. Despite its evolutionary importance, the stability of spatial segregation is largely unknown. Furthermore, closely...
Article
Hybridization between native and alien congeners may pose a serious threat to biodiversity and negatively affect native flora. Here we study Solidago ×niederederi, which originated and became established in Europe as a result of a cross between the alien S. canadensis and native S. virgaurea. The recent increase in the number of records of S. ×nied...
Article
The paper aims to provide a comprehensive overview of karyological and morphological variability of the Tanacetum corymbosum group in Slovakia. We estimated DNA ploidy level and relative DNA content of 530 individuals (45 populations) using DAPI flow cytometry. The morphological variation was studied by univariate as well as multivariate morphometr...
Article
Full-text available
Recurrent polyploid formation and weak reproductive barriers between independent polyploid lineages generate intricate species complexes with high diversity and reticulate evolutionary history. Uncovering the evolutionary processes that formed their present-day cytotypic and genetic structure is a challenging task. We studied the species complex of...
Article
Full-text available
Members of the genus Sesleria are important vegetation elements and are regarded as diagnostic or constant species in many plant communities. However, their identification is often problematic due to their similar morphology and phenotypic plasticity. Although the genus has been studied by many specialists, numerous taxonomic problems remain unreso...
Article
Besides the well-known negative effects of invasive plant species on autochthonous plant communities, the breakdown of genetic integrity of indigenous species via alien-to-native hybridisation represents an additional direct threat to native flora which should not be underestimated. Our aim was to survey the current distribution of Solidago ×nieder...
Article
Solidago ×niederederi Khek (1905: 22) is a hybrid between North-American S. canadensis Linnaeus (1753: 878) and European native S. virgaurea Linnaeus (1753: 880). Solidago canadensis was introduced to Europe in the 17th century (Kowarik 2003). It has spread invasively throughout Europe since the second half of the 19th century (Weber 1998), reachin...
Article
Full-text available
The proportion of endemic taxa is a frequently used measure for assesment of biodiversity hotspots within the Carpathians. For confirming of an endemic status of a taxon, a thorough evaluation using modern tools of plant systematics is desirable. Tephroseris longifolia subsp. moravica has been considered to be a Western Carpathian endemic, but a pr...
Article
Full-text available
The taxonomy of the Cyanus tuberosus group has been unsettled since its first members were described in the nineteenth century. In this paper, we provide a revision of the group based on analyses of its genetic (amplified fragment length polymorphisms; 240 individuals), morphological (48 morphological traits, 611 individuals), ecological (42 studie...
Article
The taxonomy of the Cyanus tuberosus group has been unsettled since its first members were described in the nineteenth century. In this paper, we provide a revision of the group based on analyses of its genetic (amplified fragment length polymorphisms; 240 individuals), morphological (48 morphological traits, 611 individuals), ecological (42 studie...
Article
Cardamine occulta, recently reported also as 'Asian C. flexuosa', is originally a native East Asian weed of paddy fields and other open habitats. It has been recorded throughout the world and is now also spreading widely in Europe. However, how this species differs morphologically from European C. flexuosa and its closest relatives in Asia (C. koka...
Article
Full-text available
Tephroseris longifolia agg. is a complex group of outcrossing perennials distributed throughout Central Europe. Recent morphological study revealed six morphotypes corresponding to five previously distinguished subspecies, together with Alpine and Pannonian morphotypes of T. longifolia subsp. longifolia. The delimited morphotypes differ in relative...
Article
Full-text available
There was an error in Figure 7. The correct figure is shown here. The figure in the issue has been corrected online. The publisher apologizes for this error.
Article
Background and Aims The Balkan Peninsula is one of the most important centres of plant diversity in Europe. Here we aim to fill the gap in the current knowledge of the evolutionary processes and factors modelling this astonishing biological richness by applying multiple approaches to the Cyanus napulifer group. Methods To reconstruct the mode of di...
Article
Full-text available
Database of published chromosome numbers and ploidy-level estimates of the tribe Alysseae is presented, together with the revised generic concept and the list of accepted names, to reflect the most recent taxonomic and phylogenetic studies in Alysseae. It is available on-line at www.alysseae.sav.sk. The tribe encompasses 24 genera and 277 species....
Data
Supplementary material 2 Online Resource 2. Distribution of chromosome numbers and ploidy levels in the genera Alyssum, Clypeola, Hormathophylla and Odontarrhena. For the construction of this histogram, haploid chromosome numbers were multiplied by two and ploidy-level estimates were assigned to the relevant chromosome numbers.
Data
Supplementary material 1 Online Resource 1. List of tables and fields in the AlyBase database.
Article
Full-text available
Tephroseris longifolia agg. is an intricate complex of perennial outcrossing herbaceous plants. Recently, five subspecies with rather separate distributions and different geographic patterns were assigned to the aggregate: T. longifolia subsp. longifolia, subsp. pseudocrispa and subsp. gaudinii predominate in the Eastern Alps; the distribution of s...
Article
Full-text available
Five cytotypes have been reported for Jacobaea vulgaris (syn.: Senecio jacobaea); three of them with euploid (tetraploid, hexaploid, and octoploid; 2n = 40, 60, and 80) and one with aneuploid (2n = 32) chromosome numbers. Among them, only tetra- and octoploid cytotypes are regularly found, the other two are very rare. In this study we re-evaluated...
Article
Full-text available
Mode of reproduction and presence of reproductive barriers were studied in two closely related members of the genus Cyanus: the C. triumfetti (diploid 2n = 22) and C. montanus (tetraploid 2n = 44) groups. Based on results from isolation and emasculation experiments, taxa of these groups can be considered allogamous with a low selfing rate (0.07 %–0...
Article
To reveal the general cytogeographical pattern of Cyanus section Protocyanus in Europe, DNA ploidy and/or chromosome numbers were newly examined for 160 populations by flow cytometry (450 plants) and/or chromosome counting (30 plants). Furthermore, previously published karyological data were revised (236 records). Our analyses confirmed chromosome...
Article
Full-text available
The genome size of 265 plants and the GC content of 126 plants from 63 populations of the Cyanus triumfetti and Cyanus montanus groups, collected across the Carpathians, Pannonia, Bohemian Massif, and Western and Dinaric Alps were determined by PI and DAPI flow cytometry. Variation of the nuclear DNA content among homoploid species, and intraspecif...
Article
Full-text available
Multivariate morphometrics and an assessment of genetic diversity obtained using amplified fragment length polymorphism (AFLP) were used to determine the variability of the polymorphic group Cyanus triumfetti in Central Europe. The ploidy level of the populations studied was also determined; all individuals from the C. triumfetti group were diploid...
Article
Full-text available
Multivariate morphometrics and an assessment of genetic diversity obtained using amplified fragment length polymorphism (AFLP) were used to determine the variability of the polymorphic group Cyanus triumfetti in Central Europe. The ploidy level of the populations studied was also determined; all individuals from the C. triumfetti group were diploid...
Article
Full-text available
The pronounced morphological variation of the Cyanus triumfettii group (syn. Centaurea triumfettii s. latissimo) in the western Carpathians and Pannonia has resulted in confusing and contradictory taxonomic treatments. We focus on the taxonomic identity of populations which have been treated as C. triumfettii subsp. triumfettii in this area. Karyol...

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Projects

Project (1)
Project
The project deals with triggers and consequences of polyploidisation (whole genome duplication) on the example of three polyploid complexes from the genera Alyssum, Arabidopsis and Cardamine (Brassicaceae family). Analysis of the influence of cryptic variation of diploid and independently arisen polyploid lineages, together with ecological and morphological consequences of polyploidisation, and influence of selection on genomes of di- and polyploid lineages is proposed. For the Cardamine pratensis complex, evolutionary potential of dysploidy will be also estimated. New genomic techniques (RADseq, target enrichment, genome resequencing), comparative chromosome painting (CCP), ecological experiments and bioclimatic modelling will be used. Key advantage is the detailed knowledge of all three plant systems by the team, including details on evolutionary history, experience with proposed methods in the studied systems and already available material for DNA analyses. Close relationships of the studied taxa with Arabidopsis thaliana makes the use and interpretation of genomic techniques easier and grants the wide publicity of acquired results.