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Analysis of selected parameters inbred and hybrid maize stressed by flooding
Čečetka, Petr ; Kočová, Marie (advisor) ; Hnilička, František (referee)
Flooding is an important stress factor that influences the growth of plants and their production. Anthropogenic activity is causing gradual changes in the climate, consequently triggering changes in the distribution of precipitation. This leads to the conditions alternating between optimal, draughts, and excessive flooding that the plants have to cope with. The aim of my diploma thesis was to evaluate the consequences of flooding and the subsequent restoration of normal cultivating conditions of two inbred lines of maize (Zea mays L.) (2023 and CE704) and their reciprocal hybrids (2023xCE704, CE704x2023) that were exposed to the stress of flooding and subsequent restoration during several phases of their ontogenetic growth. For both the plants exposed to flooding and the subsequent restoration and the plants grown in optimal conditions only, there were several morphologic and physiological parameters, parameters related to the water status, and parameters that determine the extent of the damage done to the cellular structure or characterize the defense mechanisms employed by the plant in reaction to the stress. Flooding of the plants often led to an increase in their transpiration speed, stomatal conductivity, MDA and H2O2 contents, and catalase activity. For other parameters, the flooding usually...
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Fish Herpesviruses
Čečetka, Petr ; Forstová, Jitka (advisor) ; Kuthan, Martin (referee)
Herpetic viruses that attack fish are ones of the most widespread virus pathogens, threatening modern day fish population not only in the wild but also those that are farmed. There are many types of the pathogen, from the ones those do not cause severe diseases to those that are extremly dangerous, spread without any control and caused vast losses in commercial farming and in wild populations. Most of the viruses exhibit increased sensitivity on heat and stress factors, which are the most common reasons of the repeating outbreak of disease. To the best described fis herpesvirus viruses attacking fresh water fishes belong. Nowadays more and more herpetic viruses which attack mainly salt water fis are beeing discovered. Powered by TCPDF (www.tcpdf.org)
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Response of maize lines and hybrids to hypoxia stress depending on plant development
Čečetka, Petr ; Kočová, Marie (advisor) ; Hniličková, Helena (referee)
Flooding-induced hypoxia is one of the significant abiotic stress factors that influence the development of plants. The ongoing climate change leads to changes in the distribution of precipitation, causing excessive droughts followed by torrential rains and, consequently, flooding. Inappropriate agronomic practices and the choice and rotation of the cultivated crops also greatly influence the duration of the drought or flooding. The plants must either be able to adapt to these conditions, or the agricultural production must only select suitable genotypes that are tolerant of these conditions. The aim of this thesis was the comparison of the reaction of 4 genotypes (2023, CE704, 2023xCE704 and CE704x2023) of maize (Zea mays L.) grown in flood conditions to which they were exposed at different stages of their ontogenic development, as compared to plants grown under optimal water supply conditions. Various parameters showing the general condition and significant functions of the plants (morphological parameters, plant-water relations parameters, photosynthetic parameters, and cell damage parameters) were measured. Among the plants exposed to flooding, the reactions differed greatly based on the age of the plants. Younger plants showed an increase in transpiration speed values, stomatal conductivity,...
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Analysis of selected parameters inbred and hybrid maize stressed by flooding
Čečetka, Petr ; Kočová, Marie (advisor) ; Hnilička, František (referee)
Flooding is an important stress factor that influences the growth of plants and their production. Anthropogenic activity is causing gradual changes in the climate, consequently triggering changes in the distribution of precipitation. This leads to the conditions alternating between optimal, draughts, and excessive flooding that the plants have to cope with. The aim of my diploma thesis was to evaluate the consequences of flooding and the subsequent restoration of normal cultivating conditions of two inbred lines of maize (Zea mays L.) (2023 and CE704) and their reciprocal hybrids (2023xCE704, CE704x2023) that were exposed to the stress of flooding and subsequent restoration during several phases of their ontogenetic growth. For both the plants exposed to flooding and the subsequent restoration and the plants grown in optimal conditions only, there were several morphologic and physiological parameters, parameters related to the water status, and parameters that determine the extent of the damage done to the cellular structure or characterize the defense mechanisms employed by the plant in reaction to the stress. Flooding of the plants often led to an increase in their transpiration speed, stomatal conductivity, MDA and H2O2 contents, and catalase activity. For other parameters, the flooding usually...
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Fish Herpesviruses
Čečetka, Petr ; Forstová, Jitka (advisor) ; Kuthan, Martin (referee)
Herpetic viruses that attack fish are ones of the most widespread virus pathogens, threatening modern day fish population not only in the wild but also those that are farmed. There are many types of the pathogen, from the ones those do not cause severe diseases to those that are extremly dangerous, spread without any control and caused vast losses in commercial farming and in wild populations. Most of the viruses exhibit increased sensitivity on heat and stress factors, which are the most common reasons of the repeating outbreak of disease. To the best described fis herpesvirus viruses attacking fresh water fishes belong. Nowadays more and more herpetic viruses which attack mainly salt water fis are beeing discovered. Powered by TCPDF (www.tcpdf.org)
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