Jindřich Chrtek, Václav Jirásek,
SUMMARY The perennial species of the genus Trisetum Pers. are usually divided into two sections, Trisetum (= Eu-Trisetum Asch, et Gr.) and Trisetaera Asch, et Gr. The authors remove the species Trisetum gracile (Moris) Par1., T. glaciale Boiss. and T. antoni-josephii F.-Q. et Muñ. Med. from the section Trisetum and assign them to the new section Gracilia with the type species T. gracile. The mentioned species differ from the other species of the seotion Trisetum above all by their low growth and by ...
Tópico(s): Lichen and fungal ecology
1963 - Taylor & Francis | Webbia
Tópico(s): Animal Nutrition and Physiology
1984 - Springer Nature | Folia Geobotanica et Phytotaxonomica
Jindřich Chrtek, J. Zahradníček, Karol Krak, Judith Fehrer,
Hieracium subgenus Hieracium is one of the taxonomically most intricate groups of vascular plants, due to polyploidy and a diversity of breeeding systems (sexuality vs. apomixis). The aim of the present study was to analyse nuclear genome size in a phylogenetic framework and to assess relationships between genome size and ploidy, breeding system and selected ecogeographic features. Holoploid and monoploid genome sizes (C- and Cx-values) of 215 cultivated plants from 89 field populations of 42 so-called ' ...
Tópico(s): Botanical Research and Chemistry
2009 - Oxford University Press | Annals of Botany
Judith Fehrer, Karol Krak, Jindřich Chrtek,
Hieracium s.str. is a complex species-rich group of perennial herbs composed of few sexual diploids and numerous apomictic polyploids. The existence of reticulation and the near-continuity of morphological characters across taxa seriously affect species determination, making Hieracium one of the best examples of a 'botanist's nightmare'. Consequently, its species relationships have not previously been addressed by molecular methods. Concentrating on the supposed major evolutionary units, we used ...
Tópico(s): Botany, Ecology, and Taxonomy Studies
2009 - Springer Science+Business Media | BMC Evolutionary Biology
Petr Pyšek, Vojtĕch Jaros̆ı́k, Jan Pergl, R. P. Randall, Milan Chytrý, Ingolf Kühn, Lubomír Tichý, Jiří Danihelka, Jindřich Chrtek, Jiřı́ Sádlo,
Abstract Aim Determining which traits predispose a species to become invasive is a fundamental question of invasion ecology, but traits affect invasiveness in concert with other factors that need to be controlled for. Here, we explore the relative effects of biological traits of plant species and their distributional characteristics in the native range on invasion success at two stages of invasion. Location Czech Republic (for native species); and the world (for alien species). Methods The source ...
Tópico(s): Biological Control of Invasive Species
2009 - Wiley | Diversity and Distributions
Patrik Mráz, Jindřich Chrtek, Barbora Šingliarová,
Hieracium alpinum L. (Asteraceae) is an arctic-alpine species distributed throughout Europe with both diploid and triploid cytotypes. We determined the ploidy levels of plants from 23 populations from Austria, Bosnia and Herzegovina, Finland, Italy, Norway, Romania, Slovakia, Switzerland and Ukraine. Data showed a non-overlapping pattern of cytotype distribution: sexually reproducing diploids (2n = 2x = 18) occur solely in the Eastern and Southern Carpathians, while apomictic triploids (2n = 3x = 27) cover ...
Tópico(s): Plant Reproductive Biology
2009 - Birkhäuser | Botanica Helvetica
Barbora Šingliarová, Jindřich Chrtek, Patrik Mráz,
Tópico(s): Botany and Plant Ecology Studies
2008 - Springer Science+Business Media | Plant Systematics and Evolution
Jindřich Chrtek, Patrik Mráz, Jaroslav Zahradníčk, Gonzálo Mateo, Zbigniew Szeląg,
Tópico(s): Mediterranean and Iberian flora and fauna
2007 - Springer Nature (Netherlands) | Folia Geobotanica
Jindřich Chrtek, MARTINA TONKOVÁ, Patrik Mráz, Karol Marhold, Ivana Plačková, Anna Krahulcová, Jan Kirschner,
The overall pattern of morphological variation and genetic diversity (allozyme analysis) was studied in the Hieracium nigrescens group (H. nigrescens s.l., H. alpinum ≥ H. murorum) in the Sudety Mountains and the Western Carpathians. A morphological analysis was performed on 180 plants from 12 populations belonging to six a priori distinguished taxa. Altogether, 25 characters were measured or scored. Morphometric (canonical discriminant analysis) data separated five taxa, evaluated here at the species ...
Tópico(s): Botanical Studies and Applications
2007 - Oxford University Press | Botanical Journal of the Linnean Society
Barbora Šingliarová, Jindřich Chrtek, Ivana Plačková, Patrik Mráz,
The Pilosella alpicola group includes four species (P. alpicola s.str., P. ullepitschii, P. rhodopea and P. serbica) with allopatric distributions (Alps, Balkans, Carpathians) and contrasting cytotype patterns (diploid, diploid-polyploid and polyploid species). Whereas diploid taxa (P. ullepitschii and P. serbica) reproduce sexually, the mode of reproduction of polyploid cytotypes reflects their origin: autopolyploids of P. rhodopea reproduce sexually, while allopolyploid cytotypes of P. alpicola s. ...
Tópico(s): Botanical Research and Chemistry
2011 - Springer Nature (Netherlands) | Folia Geobotanica
Pavel Trávníček, Zuzana Dočkalová, Radka Rosenbaumová, Barbora Kubátová, Zbigniew Szeląg, Jindřich Chrtek,
Background and AimsA detailed knowledge of cytotype distribution can provide important insights into the evolutionary history of polyploid systems. This study aims to explore the spatial distribution of different cytotypes in Pilosella echioides at various spatial scales (from the whole distributional range to the population level) and to outline possible evolutionary scenarios for the observed geographic pattern.
Tópico(s): Plant Reproductive Biology
2011 - Oxford University Press | Annals of Botany
Patrik Mráz, Jindřich Chrtek, Judith Fehrer,
Although reticulation has indisputably played an important role in the evolutionary history of the genus Hieracium s. str. (Asteraceae), convincingly documented cases of recent interspecific hybridization are very rare. Here we report combined evidence on recent hybridization between two diploid species, Hieracium alpinum and H. transsilvanicum. The hybrid origin of the plants from the Romanian Eastern Carpathians was supported by additive patterns of nuclear ribosomal DNA polymorphism (ITS), an intermediate ...
Tópico(s): Plant and fungal interactions
2011 - Springer Science+Business Media | Plant Systematics and Evolution
Tomáš Peckert, Jindřich Chrtek,
Tópico(s): Plant Reproductive Biology
2006 - Springer Nature (Netherlands) | Folia Geobotanica
Judith Fehrer, Birgit Gemeinholzer, Jindřich Chrtek, Siegfried Bräutigam,
Phylogenetic relationships for Hieracium subgen. Pilosella were inferred from chloroplast (trnT–trnL, matK) and nuclear (ITS) sequence data. Chloroplast markers revealed the existence of two divergent haplotype groups within the subgenus that did not correspond to presumed relationships. Furthermore, chloroplast haplotypes of the genera Hispidella and Andryala nested each within one of these groups. In contrast, ITS data were generally in accord with morphology and other evidence and were therefore ...
Tópico(s): Botany, Ecology, and Taxonomy Studies
2006 - Elsevier BV | Molecular Phylogenetics and Evolution
Jindřich Chrtek, Patrik Mráz, Alexander N. Sennikov,
Tópico(s): Mediterranean and Iberian flora and fauna
2006 - Springer Nature | Biologia
Karol Krak, Petra Caklová, Jindřich Chrtek, Judith Fehrer,
Phylogeny reconstruction based on multiple unlinked markers is often hampered by incongruent gene trees, especially in closely related species complexes with high degrees of hybridization and polyploidy. To investigate the particular strengths and limitations of chloroplast DNA (cpDNA), low-copy nuclear and multicopy nuclear markers for elucidating the evolutionary history of such groups, we focus on Hieracium s.str., a predominantly apomictic genus combining the above-mentioned features. Sequences ...
Tópico(s): Botany, Ecology, and Taxonomy Studies
2012 - Springer Nature | Heredity
Jiří Danihelka, Jindřich Chrtek, Ždenek Kaplan,
A checklist of vascular plants of the Czech Republic is provided, based on the Kubat et al’s Key to the flora of the Czech Republic from 2002 and volumes 7 and 8 of the Flora of the Czech Republic as taxonomic reference, and incorporating numerous floristic, taxonomic and nomenclatural novelties. Native, alien, both naturalized and casual, as well as frequently cultivated taxa are included. Species, subspecies, nothospecies and nothosubspecies, and some frequently used variety names are listed. ...
Tópico(s): Bryophyte Studies and Records
2012 - Czech Botanical Society | Preslia
Petr Pyšek, Jiří Danihelka, Jiřı́ Sádlo, Jindřich Chrtek, Milan Chytrý, Vojtĕch Jaros̆ı́k, Ždenek Kaplan, František Krahulec, Lenka Moravcová, Jan Pergl, Kateřina Štajerová, Lubomír Tichý,
A complete list of all alien taxa ever recorded in the flora of the Czech Republic is presented as an update of the original checklist published in 2002. New data accumulated in the last decade are incorporated and the listing and status of some taxa are reassessed based on improved knowledge. Alien flora of the Czech Republic consists of 1454 taxa listed with information on their taxonomic position, life history, geographic origin (or mode of origin, distinguishing anecophyte and hybrid), invasive ...
Tópico(s): Botany, Ecology, and Taxonomy Studies
2012 - Czech Botanical Society | Preslia
Bohumil Mandák, Kateřina Berchová‐Bímová, Ivana Plačková, Václav Mahelka, Jindřich Chrtek,
• Background and Aims Genetic variability was estimated for Atriplex tatarica from 25 populations in the Czech Republic. Since its north-western range margin is in central Europe, a relationship between marginality and low within-population genetic diversity was tested in accordance with the Central–Marginal Model.
Tópico(s): Botany and Plant Ecology Studies
2005 - Oxford University Press | Annals of Botany
Patrik Mráz, Jindřich Chrtek, Judith Fehrer, Ivana Plačková,
Tópico(s): Plant and fungal interactions
2005 - Springer Science+Business Media | Plant Systematics and Evolution
Helena Štorchová, Radmila Hrdličková, Jindřich Chrtek, Martin Tetera, Dorothee Fitze, Judith Fehrer,
Summary Štorchová, H., Hrdličková, R., Chrtek, J., Jr., Tetera, M., Fitze, D. & Fehrer, J.: An improved method of DNA isolation from plants collected in the field and conserved in saturated NaCl/CTAB solution. – Taxon 49: 79‐84. 2000. – ISSN 0040‐0262. A simple method for isolation of genomic DNA from wild plants sampled in remote field areas is presented. The protocol combines NaCl/CTAB leaf preservation with sorbitol extraction of secondary compounds which often contain inhibitors of Taq DNA polymerase ...
Tópico(s): Genetic diversity and population structure
2000 - Wiley | Taxon
Melanie L. Hand, Petr Vít, Anna Krahulcová, Steven D. Johnson, Karsten Oelkers, Hayley Siddons, Jindřich Chrtek, Judith Fehrer, Anna M. Koltunow,
The Hieracium and Pilosella (Lactuceae, Asteraceae) genera of closely related hawkweeds contain species with two different modes of gametophytic apomixis (asexual seed formation). Both genera contain polyploid species, and in wild populations, sexual and apomictic species co-exist. Apomixis is known to co-exist with sexuality in apomictic Pilosella individuals, however, apomictic Hieracium have been regarded as obligate apomicts. Here, a developmental analysis of apomixis within 16 Hieracium species ...
Tópico(s): Mediterranean and Iberian flora and fauna
2014 - Springer Nature | Heredity
Jarmila Gabrielová, Zuzana Münzbergová, Oliver Tackenberg, Jindřich Chrtek,
Tópico(s): Plant Parasitism and Resistance
2013 - Springer Nature (Netherlands) | Folia Geobotanica
Filip Kolář, Magdalena Lučanová, Petr Vít, Tomáš Urfus, Jindřich Chrtek, Tomáš Fér, Friedrich Ehrendorfer, Jan Suda,
Plants endemic to areas covered by ice sheets during the last glaciation represent paradigmatic examples of rapid speciation in changing environments, yet very few systems outside the harsh arctic zone have been comprehensively investigated so far. The Galium pusillum aggregate (Rubiaceae) is a challenging species complex that exhibits a marked differentiation in boreal parts of Northern Europe. As a first step towards understanding its evolutionary history in deglaciated regions, this study assesses ...
Tópico(s): Plant Taxonomy and Phylogenetics
2013 - Oxford University Press | Annals of Botany
Tomáš Herben, Pavel Trávníček, Jindřich Chrtek,
One of the key modes of plant speciation is polyploidy (duplication of all chromosomes), which can lead to sympatric speciation because it is often associated with limited gene flow and reproductive isolation. To understand the dynamics of sympatric mixed-ploidy systems, we examined the processes operating in them using a general gametic model parameterized by a factorial hybridization experiment. We demonstrate that unreduced gametes combining freely among parents of different ploidy are the core ...
Tópico(s): Genetic Mapping and Diversity in Plants and Animals
2015 - Elsevier BV | Perspectives in Plant Ecology Evolution and Systematics
Alejandra Pilar Rendina González, Jindřich Chrtek, Petre I. Dobrev, Veronika Dumalasová, Judith Fehrer, Patrik Mráz, Vít Latzel,
PREMISE OF THE STUDY: The phenotype of an individual can be modified by the environment experienced by its predecessors, a phenomenon called transgenerational or maternal effects. These effects are studied mostly across sexual generations and are thought to be mediated also by epigenetic variation. However, we do not know how important transgenerational effects are across asexual generations of clonal plants. METHODS: We investigated the role of different drought intensities and durations experienced ...
Tópico(s): Soybean genetics and cultivation
2016 - Wiley | American Journal of Botany
Jan Pergl, Jiřı́ Sádlo, Petr Petřík, Jiří Danihelka, Jindřich Chrtek, Martin Hejda, Lenka Moravcová, Irena Perglová, Kateřina Štajerová, Petr Pyšek,
Ornamental plants constitute an important source of alien, and potentially invasive species, but also include a substantial part of native flora and consist of taxa that occur both in the wild and in cultivation; yet garden floras are largely ignored in ecological studies.We studied ornamental plants in the Czech Republic in order to provide detailed information, based on field sampling, on the diversity of taxa grown in cultivation in private gardens. Sampling was done in accessible public areas, ...
Tópico(s): Botany, Ecology, and Taxonomy Studies
2016 - Czech Botanical Society | Preslia
Tópico(s): Mycorrhizal Fungi and Plant Interactions
1997 - Springer Nature (Netherlands) | Folia Geobotanica
Anna Krahulcová, Jindřich Chrtek, František Krahulec,
Tópico(s): Legume Nitrogen Fixing Symbiosis
1999 - Springer Nature (Netherlands) | Folia Geobotanica
Jindřich Chrtek, Tomáš Herben, Radka Rosenbaumová, Zuzana Münzbergová, Zuzana Dočkalová, J. Zahradníček, Jana Krejčíková, Pavel Trávníček,
Processes driving ploidal diversity at the population level are virtually unknown. Their identification should use a combination of large-scale screening of ploidy levels in the field, pairwise crossing experiments and mathematical modelling linking these two types of data. We applied this approach to determine the drivers of frequencies of coexisting cytotypes in mixed-ploidy field populations of the fully sexual plant species Pilosella echioides. We examined fecundity and ploidal diversity in ...
Tópico(s): Plant Reproductive Biology
2017 - Springer Science+Business Media | BMC Evolutionary Biology