Publications by authors named "K Kubikova"
Premise: Endoreduplication, nonheritable duplication of a nuclear genome, is widespread in plants and plays a role in developmental processes related to cell differentiation. However, neither ecological nor cytological factors influencing intraspecific variation in endoreduplication are fully understood.
Methods: We cultivated plants covering the range-wide natural diversity of diploid and tetraploid populations of Arabidopsis arenosa in common conditions to investigate the effect of original ploidy level on endoreduplication.
Article Synopsis
- - Hybrid seed inviability (HSI) plays a crucial role in reproductive isolation, impacting speciation by varying in strength among diploid species and potentially influencing ploidy-variable species as well.
- - The study examined HSI variation within a diploid-autotetraploid species using data from 12 population pairs across three different contact zones, focusing on the effects of crossing direction, ploidy differences, and spatial arrangement on reproductive barriers.
- - Results revealed significant parent-of-origin effects on endosperm development and hybrid performance, indicating that these variations contribute to interploidy reproductive isolation and the overall fitness of the species, highlighting HSI as a key factor regardless of evolutionary history.
Premise: Whole genome duplication is a major evolutionary event, but its role in ecological divergence remains equivocal. When populations of different ploidy (cytotypes) overlap in space, "contact zones" are formed, allowing the study of evolutionary mechanisms contributing toward ploidy divergence. Multiple contact zones per species' range are often described but rarely leveraged as natural replicates.
View Article and Find Full Text PDFNatural polyphenols are a wide class of secondary plant metabolites and represent an abundant antioxidant component of human diet. An important, but often neglected group of natural polyphenols, are tannins. This review offers a general description of chemistry of both hydrolysable and condensed tannins (proanthocyanidins), the mechanisms of their antioxidation action, like free radical scavenging activity, chelation of transition metals, inhibition of prooxidative enzymes and lipid peroxidation.
View Article and Find Full Text PDFA simple and sensitive high-performance liquid chromatography method for the determination of four Leuzea carthamoides flavonoids, namely eriodictyol, patuletin, eriodictyol-7-beta-glucopyranoside, and 6-hydroxykaempferol-7-O-(6"-O-acetyl-beta-D-glucopyranoside), is presented. Using this method, quantitative composition of flavonoids ranged from 0.011% to 0.
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