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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Seed dormancy mechanisms of mycoheterotrophic plants
 Figura, Tomáš ; Ponert, Jan (advisor) ; Weiser, Martin (referee)
Seeds of mycoheterotrophic plants known as dust seeds which are typical for the family Orchidaceae and 11 other families have inner (physiological, morphological) and outer (physical) dormancy. Dormancy breaking it is a necessary step for a seed to germinate. For breaking the exogenous dormancy it is necessary to break both inner and outer testa, which can be done by scarification. Chemical scarification, mostly done by chlorine, is commonly used and it seems to be the best way for breaking dormancy and also for sterilization of seeds. Other sterilization agents as ethanol and sulfuric acid are also commonly used. For breaking the inner (physical) dormancy, application of growth regulators can be useful, especially in the case of cytokinins, specifically kinetine. Abscisic acid induces dormancy and ethylene induces germination. Anorganic forms of nitrogen have also inhibitory effects for germination at least for some species. Seeds of most orchid species also need a period of chilling after sowing and for germination they mostly need temperature around 23řC.
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The impact of management methods on the \kur{D. sambucina} populations' size and it's occurrence in the Vsetin region.
 HAJDUCHOVÁ, Kristýna
The occurrence of the orchid species Dactylorhiza sambucina was verified at 86 localities in the region of Vsetínské vrchy and Javorníky mountains. The suitability of the management methods for grassland ecosystems with the occurrence of D. sambucina was studied from the point of view of the composition of the vegetation and a comparison of the historical management with current practices. In addition, the sizes of the populations of D. sambucina at the localities with different management regimes were compared and the reaction of the populations to the changes in management practices was discussed.
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