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Transgenerational effects of plant biotic interactions
PUY GUTIÉRREZ, Javier
This thesis focuses on the transgenerational effects triggered by plant biotic interactions and explores their relevance on ecological and evolutionary processes. The following sections document novel results that show their important consequences on different aspects. Primarily, we established the necessary methodology to be able to explore these questions and to disentangle the mechanisms originating the transgenerational plasticity by validating a demethylation method. Then, we checked whether the biotic interactions alter the phenotype via within-generation and transgenerational plasticity, examining the magnitude and direction of the response on each specific "response traits". Lastly, the potential role of transgenerational plasticity for adaptation, species coexistence, creating biodiversity and population and ecosystem functioning is tested.
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Specificity between partners in arbuscular mycorrhizal symbiosis
Voříšková, Alena ; Janoušková, Martina (advisor) ; Püschel, David (referee)
Arbuscular mycorrhiza (AM) is a symbiotic interaction between vascular plants and arbuscular mycorrhizal fungi from phylum Glomeromycota. AM symbiosis is considered as a nonspecific interaction, because AM fungi are able to colonize roots of all plant species which are hosts for this type of symbiosis, nevertheless certain specific interactions exist between the partners. The specificity can be evident on the level of the formation of mycorrhiza, which means that different species of plants can vary in the composition of fungal community in their roots or AM fungi can differ in an ability of colonization and sporulation depending on host plant species. The specificity can also manifest as different functionality of the symbiosis in dependence on the particular partners affecting the mycorrhizal response of the host plants. All of these specific interactions can have an impact on the coexistence and diversity of plants in communities.
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Trait ecology of arbuscular mycorrhizal fungi
Hudáková, Zuzana ; Kohout, Petr (advisor) ; Ponert, Jan (referee)
Arbuscular mycorrhiza is a type of mutualistic symbiosis between fungi of the Glomeromycota division and the roots of vascular plants, which is the most common kind of mycorrhiza in the world. It is based on the exchange of substances, where the mycorrhizal fungus provides the plant with mineral nutrition and protection against pathogens and stress, and its plant host returns its products of assimilation. The phylogenetic classification of the division is equivocal, and we recognise two views on their categorisation into taxonomic groups, according to the morphology of their spores or by molecular methods, which is based on the rDNA sequence. The aim of the work is to characterise the influence of different taxa of the Glomeromycota division on the host based on their spores and the type of mycelium they prefer to form. This also affects the possibilities of the fungus, by which it can influence the life of the host plant. Key words: arbuscular mycorrhiza, arbuscular mycorrhizal fungi, Glomeromycota, spores, intraradical mycelium, extraradical mycelium, functional traits
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Life history strategies of arbuscular mycorrhizal fungi
Fričová, Renata ; Janoušková, Martina (advisor) ; Kohout, Petr (referee)
Arbuscular mycorrhiza is a symbiotic interaction of vascular plants and arbuscular mycorrhizal (AM) fungi from subphylum Glomeromycotina. Currently, it is difficult to predict the population dynamics of AM fungal communities, mainly because little is known about their life-history strategies. However, it is clear that AM fungi differ in a range of traits. Physiological and ecological differences between AM fungi can affect the outcome of their competition as well as cooperation with the plant symbiont and the successional dynamics of the whole community. In order to advance our knowledge of AM fungal life-history strategies, it is crucial to deepen our understanding of the traits and factors that modify interactions between the symbionts. This bachelor thesis is designed as a literature survey aimed at summarizing knowledge about functional traits of AM fungi and the impact of these traits on their life-history strategies. Key words: arbuscular mycorrhizal fungi, life-history strategies, host plant, traits, mycelium, colonization, competition, community, succession
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Contribution of arbuscular mycorrhiza to ecosystem services in agroecosystems
Šabatková, Zuzana ; Janoušková, Martina (advisor) ; Kohout, Petr (referee)
Arbuscular mycorrhizal fungi are significant plant mutualists providing their host plants with many benefits. For efficient use of arbuscular mycorrhiza in agricultural systems, it is important to understand factors, which can influence the beneficial effects of the symbiosis, and how arbuscular mycorrhizal fungi alter plant physiological mechanisms. If used correctly, arbuscular mycorrhizal fungi could importantly contribute to various ecosystem services in agroecosystems and thus alleviate yield losses and decrease the negative impact of agriculture on ecosystems. This thesis summarizes the impact of arbuscular mycorrhizal fungi on crop plants in agroecosystems, their occurence in agricultural systems, particularly in arable soils, as well as their contribution to selected ecosystem services in agroecosystems. Key words: arbuscular mycorrhizal fungi, ecosystem services, agroecosystem, soil formation, environmental stress, plant resistence
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Specificity between partners in arbuscular mycorrhizal symbiosis
Voříšková, Alena ; Janoušková, Martina (advisor) ; Püschel, David (referee)
Arbuscular mycorrhiza (AM) is a symbiotic interaction between vascular plants and arbuscular mycorrhizal fungi from phylum Glomeromycota. AM symbiosis is considered as a nonspecific interaction, because AM fungi are able to colonize roots of all plant species which are hosts for this type of symbiosis, nevertheless certain specific interactions exist between the partners. The specificity can be evident on the level of the formation of mycorrhiza, which means that different species of plants can vary in the composition of fungal community in their roots or AM fungi can differ in an ability of colonization and sporulation depending on host plant species. The specificity can also manifest as different functionality of the symbiosis in dependence on the particular partners affecting the mycorrhizal response of the host plants. All of these specific interactions can have an impact on the coexistence and diversity of plants in communities.
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