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Competition of seeds and seedlings and its influence on the timing of germination
Kos, Pavel ; Weiser, Martin (advisor) ; Vazačová, Kristýna (referee)
Competition of seeds and seedlings is being reviewed in this bachelor thesis, namely relationship between competition with different timing of germination and different seed mass. The question is when and why timing of germination is changed. There is a lot of factors creating very big variation in results. Main factor is presence of other plants in same site. Also a lot of abiotic factors take very importatnt part. Because of this variability we can not pronounce clear answer. Key words: germination, competition, seed mass, timing of germination, seed, seedling
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Competition of seeds and seedlings and its influence on the timing of germination
Kos, Pavel ; Weiser, Martin (advisor) ; Vazačová, Kristýna (referee)
Competition of seeds and seedlings is being reviewed in this bachelor thesis, namely relationship between competition with different timing of germination and different seed mass. The question is when and why timing of germination is changed. There is a lot of factors creating very big variation in results. Main factor is presence of other plants in same site. Also a lot of abiotic factors take very importatnt part. Because of this variability we can not pronounce clear answer. Key words: germination, competition, seed mass, timing of germination, seed, seedling
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The evolution of dispersal traits in plants
Vazačová, Kristýna ; Münzbergová, Zuzana (advisor) ; Fér, Tomáš (referee) ; Tackenberg, Oliver (referee)
This thesis focused on evolutionary potential of dispersal traits of species in fragmented system represented by oceanic islands. I aimed to look on this topic on different levels. First, I compared traits between closely related endemic and non-endemic species to test for the existence of changes in their dispersal ability (Paper 2). Second, I searched for the traits predetermining species ability to colonize islands and to persist there (Paper 3). Third, I focused on the evolution of traits related to dispersal and persistence by inferring phylogenetic history of species group arising by adaptive radiation (Paper 4). All the objectives were explored on species of the Canary Islands. Dispersal traits were tested as direct dispersal abilities by anemo-, hydro-, exo- and endozoochory (Paper 2, 3, 4), in Paper 4 we also measured seed morphological parameters. The methodology for endozoochorous dispersal was developed in Paper 1. The comparison of dispersal traits between endemic and non-endemic species (Paper 2) did not explicitly support the hypothesis about the loss of dispersal ability in island endemics showing that reduction of dispersal ability on islands may not be as general as previously expected. In many cases, endemic species had the same or better dispersal ability than their non-endemic...
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Plant-pollinator relationships in isolated ecosystems and ecosystems with extreme fluctuations in climatic conditions
Pinc, Jan ; Vlasáková, Blanka (advisor) ; Vazačová, Kristýna (referee)
In extreme and isolated ecosystems, organisms are often specifically adapted to local abiotic conditions due to relatively fast-moving diversification and strong selection pressure. Their mutualistic relationships are very often quite unusual and unique. Plants grow in populations with a limited number of individuals. They are exposed to strong selection pressure for outcrossing to minimize the loss of genetic variability due to inbreeding, which is common in small populations. Maximizing outcrossing usually results in various modifications of pollination systems. These modifications are affected by the insufficient number of potential pollinators and by their irregular occurrence. The aim of this paper is to summarize the typical features of pollination systems in extreme and isolated ecosystems and to clarify the conditions that led to their creation.
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Sustainable agrotechnical advancement: Crop yield increase caused by natural stimulants
Vlasáková, Blanka ; Albrechtová, Jana ; Bartoš, M. ; Frantík, Tomáš ; Horna, A. ; Koblihová, Helena ; Kotyza, P. ; Kovářová, Marcela ; Látr, A. ; Nývltová, Z. ; Pilařová, M. ; Vazačová, Kristýna ; Vosátka, Miroslav
Based on a number of experiments, mostly field ones, positive effects of the described natural stimulants are used to increase utility value and yield properties of selected crops and offered as a non-risk, environment-friendly agricultural chemicals
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