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A cytological, morphometric, and ecological study of \kur{Spergularia echinosperma} in the Czech Republic and its comparison with a closely similar species S. \kur{rubra}
KÚR, Pavel
In the present study, I dealt with morphological, cytological, and ecological research on a rare Central-European species Spergularia echinosperma and its comparison with a similar weedy species S. rubra. Existence of two cytotypes of S. echinosperma significantly differing in their morphology was revealed, as well as distinct morphological differences between the two species were found. Moreover, the analyses revealed one possibly hybridogenous population. In addition, both the species and the cytotypes were also proven to display different germination behavior, which I correlate with their individual ecological adaptations.
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Phenotypic plasticity and cytotypes of \kur{Agrostis stolonifera} in the Czech Republic
KUBEŠOVÁ, Magdalena
Presence and range of phenotypic plasticity in the Agrostis stolonifera polyploid complex (Poaceae) was studied in the territory of the Czech Republic. Plants were cultivated under different experimental conditions. Stomatal size of different Agrostis stolonifera cytotypes was measured. Flow cytometry was applied for genome size estimation. Ploidy levels were determined for more than 150 samples of Agrostis stolonifera as well as several specimens of Agrostis canina, A. capillaris, A. gigantea, A. rupestris and A. vinealis. Absolute DNA content was estimated in all studied species. Isozyme analysis was used to test the possibility of the hybrid origin of pentaploid individuals of Agrostis stolonifera species.
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