|
|
The germination of plants genus \kur{Tillandsia} on different substrates
KELÍŠKOVÁ, Radka
Seeds of six plant species of the genus Tillandsia (T.tricholepis, T. schiedeana, T. mauryan, T. sphaerocephala, T. streptocarpa and T. fasciculata) was planted on six different surfaces (acacia bark, coir, peat, polystyrene, nylon stocking and jute). In the first part of the experiment were recorded number of germinated seeds on individual surfaces. In the second part of the experiment had been observed growth or dying of germinated small plants for seven months. Statistical evaluation of the results showed that the most suitable surfaces for seeding and initial growth of Tillandsia are jute, nylon stocking and polystyrene.
|
|
|
Distribution and selected ecological characteristics of \kur{Echinocystis lobata}
MÜLLEROVÁ, Anna
Echinocystis lobata is an European invasive species introduced from North America. Distribution of Echinocystis lobata was studied in the Pilsen region alongside main rivers, including Berounka, Úhlava, Úslava, Mže and Radbuza. The maps of distribution were created from information acquired from literature and field exploration. The germination experiments were conducted in climabox and garden experiments.
|
|
|
Genetická kontrola vitality obilek ječmene
Ullmannová, Kamila
Seed vigor was evaluated as germination percentage at low temperature (10 °C) and drought (-0,2 MPa), and also as germination parameters (energy, rate and index). 133 double-haploid lines (DHL) and their parents were evaluated in six environments. The total variation consisted of 51% by environments, 8% by lines and 37% by their interaction. The better parents showed higher vigor when harvested in worse location. The other parameters were controlled similarly (34,7 -- 41,0% location, 24,9 -- 32,9% year and 8 -- 37% by the lines. The results can be used as support for breeding for higher grain vigor not only for better agronomic but also for higher malting value.
|
|
|
Influence of water regime on growth and quality of selected grass species
MACHURA, Antonín
The main factors affecting the yield and the quality of grassland are nutrient availability and water regime. In nature and of course in agriculture, water is the most important factor influencing plant growth and reproduction. The aim of this thesis was to evaluate the effect of water regime on germination of selected grass species. We have focused on the following grass species, suitable for use in energy: Dactylis glomerata L. Padánia cultivar, Phalaroides arundinacea L., Chrastava cultivar and Agropyron elongatum L. Under water stress condition, the highest germination rate of 69 % was observed in Agropyron elongatum L., followed by Dactylis glomerata L. (54, 6 %). The lowest germination rate of 28, 6 % was recorded in Phalaroides arundinacea L. This study also compares dry matter yields of selected species during spring harvest. Average yield was 3,3 t.ha-1 in the first year. This work is based on authors own measurement and on the information obtained from Czech hydrometeorological institute.
|
|
| |
|
|
Influence of biotic and abiotic factors on population dynamics of a critically endangered species Spiranthes spiralis
IPSER, Zdeněk
A population of a critically endangered species Spiranthes spiralis was discovered in 1980 in the National Natural Monument Pastviště u Fínů near village Albrechtice, close to Sušice city. Since 1985 the number of flowering individuals in this population has been annually monitored. Since autumn 1998 all the specimen found there have been marked and biometrically measured. During these periods (12 or 26 years, respectively), large year-on-year fluctuations in the number of flowering plants and in the survival of the individual rosettes have been recorded. The main aim of my work was to assess the effect of weather conditions (temperature, precipitation, the number of days of snow) on the population dynamics and on the fitness of plants (leaf area, probability of flowering and probability of death). The year-round lower temperature and the wet end of autumn during the previous year (t-1) together with the wet spring of the following year (t) had a positive effect on the leaf area during the period of maximal rosette growth (end May in the year t). The probability of flowering was positively affected by the lower temperatures in May and June in the previous year (t-1) and in August just before flowering (year t). The probability of death (in the year t) was increased when the March precipitation (in t) and October temperatures (in t-1) were low. The average number of seeds in the capsule was 1528 ? 885 (s.d.). The number of flowers was positively correlated with the number of mature capsules. However, it did not affect the ratio of mature capsules. Capsules developed on average from 44% ? 24.6 % (s.d.) of the flowers. The average life time of individual plant cohorts was 4.7 years. The number of rosettes per each position was variable from 1 to 7 rosettes (73.2% positions had only 1 rosette). The annual life cycle of the underground organs is described at the end of the thesis.
|
|
| |
|
| |
|
| |
|
| |
guest ::
