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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Reproduction of \kur{Achillea millefolium} agg. and \kur{Achillea ptarmica} in meadows and verges
 TOMŠOVÁ, Pavla
Several changes in land use during the last 50 years of 20th century had a significant impact on the composition of traditional meadows. The abundance of many plant species typical for traditionally managed meadows has declined. But some of these species have found a refuge in habitats such as field margins and road verges. The aim of this study was to describe how the reproduction success of two related Achillea species A. millefolium agg. and A. ptarmica depends on (i) the particular habitat in which they grow (meadow/verge); (ii) the abundance of pollinators in the study site; and (iii) timing of flowering within the season. Moreover, the longevity of individual flowers of the two taxa has been studied in order assess the width of the time frame the reproduction takes place in. These objectives were achieved by means of measuring plant total seed production and germination as proxies of reproductive success both in meadow and verge populations at the beginning, peak and end of the flowering season of the two species in 2012. The plants were chosen at plots, where concurrently a pollinator survey has been conducted as the part of the broader project. The durations of the male and female phases of individual flowers have been studied in separate experiments.
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Ecology of hemiparasitic plant \kur{Odontites vernus} and possibilities of experimental study of hemiparasitic plants-a pilot study
 TOMŠOVÁ, Pavla
Hemiparasitic plants posse many interesting physiological and ecological traits and are of great ecological importance in many natural ecosystems. The aim of this study was (1) to review pot experiments investigating host {--} hemiparasite interaction in pot experiments, (2) find suitable conditions for germination of Odontites vernus seeds, and (3) using database data and own phytosociological relevés determine types of plant communities where hemiparasite Odontites vernus grows. Many pot experiments were carried out to investigate host {--} hemiparasite interactions. They demonstrated that hemiparasitic plants gain water and mineral nutrients from their host; although they are capable of photosynthesis, many are also able to get organic carbon from their hosts. Most of the experiments demonstrated some selectivity for an individual hosts. The amount of water and solutes taken by hemiparasite from its host differed among hosts and hemiparasite species. Experimetns reveal competition for light between hemiparasite and its hosts. My own experiments show that three to nine weeks chilling is a suitable treatment to overcome seed dormancy in Odontites vernus. Detrended Correspondence Analysis revealed three plant community types where Odontites vernus growth {--} trampled grasslands, weed communities and nutrient poor grasslands.
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See also: similar author names
1 Tomsová, Pavlína
12 Tomsová, Petra
12 Tomšová, Petra
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