Pavel Trávníček

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Polyploidization is one of the leading forces in the evolution of land plants, providing opportunities for instant speciation and rapid gain of evolutionary novelties. Highly selective conditions of serpentine environments act as an important evolutionary trigger that can be involved in various speciation processes. Whereas the significance of both edaphic(More)
The genus Anthoxanthum (sweet vernal grass, Poaceae) represents a taxonomically intricate polyploid complex with large phenotypic variation and its evolutionary relationships still poorly resolved. In order to get insight into the geographic distribution of ploidy levels and assess the taxonomic value of genome size data, we determined C- and Cx-values in(More)
There are only a few exceptions to the rule that polyploidy in Taraxacum is associated with agamospermy. One of them is the sexual, tetraploid species Taraxacum stenocephalum. Incidentally, remarkable variation in karyology was found in this species. The present study aims to confirm this variation by an extensive screen of nuclear DNA content. Individuals(More)
This study aimed to induce in vitro polyploidization in diploid ulluco (2n = 24) using oryzalin, an antimicrotubule agent. Nodal segments were treated with 0, 20, 25 or 30 μM oryzalin for 24 or 48 h. Ploidy determination of regenerants was based on flow cytometry and chromosome countings in metaphasic cells from root tips. After polyploidization, microtuber(More)
Nuclear genome size is strongly influenced by the number, size and morphology of chromosomes, and there is often a good correlation between genome size and total chromosome length within a karyotype. Because aneuploidy or the presence of accessory chromosomes has repeatedly been reported within the Anthoxanthum aristatum/ovatum complex (Poaceae), both(More)
In many plant species, somatic cell differentiation is accompanied by endoreduplication, a process during which cells undergo one or more rounds of DNA replication cycles in the absence of mitosis, resulting in nuclei with multiples of 2C DNA amounts (4C, 8C, 16C, etc.). In some orchids, a disproportionate increase in nuclear DNA contents has been observed,(More)
Despite their complex evolutionary histories, aquatic plants are highly underrepresented in contemporary biosystematic studies. Of them, the genus Callitriche is particularly interesting because of such evolutionary features as wide variation in chromosome numbers and pollination systems. However, taxonomic difficulties have prevented broader investigation(More)
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