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Úloha brassinosteroidů v odpovědi různých genotypů kukuřice na změny v zásobování vodou.
Trubanová, Nina ; Rothová, Olga (advisor) ; Hnilička, František (referee)
Brassinosteroids (BRs) have been recognized to alleviate damages caused by drought stress and to enhance tolerance to water deficit. Soaking of maize kernels before the sowing in solution with different 24-epibrassinolide concentrations (especially the 10-8 M) had a positive effect on growth of plants before and after the stress period, although it did not affected relative water content and photosynthetic parameters. After the recovery under optimal conditions there were no differences among the treatments. When compared to spraying, soaking of maize kernels was not proved to have any advantages, though its positive effect on plants germination under water deficit conditions could be possible. Based on the results of the second season experiment it is not possible to deduce the role of exogenous BRs application (spraying with 24-epibrassinolide) or endogenous BRs biosynthesis (spraying with biosynthesis inhibitor - brassinazole) in maize plants subjected to water deficit. However, decrease in relative water content in contrast to chlorophylls content increase during the days following after drought stress onset in both cultivars (contrastive in drought sensitivity) challenges for further investigation of this problem. Understanding the role of BRs in plant drought tolerance and resistance is...
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New media in school
Trubanová, Natália ; Bittnerová, Dana (advisor) ; Zandlová, Markéta (referee)
The "New Media at School" diploma thesis focuses on the presence of new media at school and on the meanings and practices associated with it. Based on participatory observation in Prague high school, semi-structured interviews and Internet resources analysis, it tries to understand how new media are involved in shaping the space and organization of the school, its teaching and learning organization. It focuses on how the school seeks to cope with the arrival of these expensive facilities for which it is responsible.It alsonotices how the school seeks to cope with the penetration of the different spaces that the new media bring into its hitherto closed environment. At the same time, it points to ways in which the school itself crosses its borders, the time-space of disciplination. Finally, it monitors the impact of new media on relationships within the school, between teachers and pupils, but also within the peer group. Through these meanings and practices, it points to the dilemmas that the emergence of new media has brought to the school environment, and analyzes how new media allows pupils to face this disciplination pressure in the school, and vice versa, in what moments new media themselves take disciplination into their own hands. The new media is not perceived as passive tools, but as actors...
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Role of brassinosteroids in plant response to drought stress
Trubanová, Nina ; Rothová, Olga (advisor) ; Urban, Milan (referee)
Brassinosteroids are steroid phytohormones with a wide range of effects. They improve survivance of plants exposed to drought stress, increase their resistence and yield therethrough. They regulate the response of plants directly (via synthesis of metabolits) and/or indirectly (via the induction of antioxidant compounds and enzymes), often in interaction with other phytohormones. Experiments studying influence of brassinosteroids on response of plants stressed with water deficit differ in several parameters. Their correct interpretation is complicated conseguently.
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New media in school
Trubanová, Natália ; Bittnerová, Dana (advisor) ; Zandlová, Markéta (referee)
The "New Media at School" diploma thesis focuses on the presence of new media at school and on the meanings and practices associated with it. Based on participatory observation in Prague high school, semi-structured interviews and Internet resources analysis, it tries to understand how new media are involved in shaping the space and organization of the school, its teaching and learning organization. It focuses on how the school seeks to cope with the arrival of these expensive facilities for which it is responsible.It alsonotices how the school seeks to cope with the penetration of the different spaces that the new media bring into its hitherto closed environment. At the same time, it points to ways in which the school itself crosses its borders, the time-space of disciplination. Finally, it monitors the impact of new media on relationships within the school, between teachers and pupils, but also within the peer group. Through these meanings and practices, it points to the dilemmas that the emergence of new media has brought to the school environment, and analyzes how new media allows pupils to face this disciplination pressure in the school, and vice versa, in what moments new media themselves take disciplination into their own hands. The new media is not perceived as passive tools, but as actors...
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Úloha brassinosteroidů v odpovědi různých genotypů kukuřice na změny v zásobování vodou.
Trubanová, Nina ; Rothová, Olga (advisor) ; Hnilička, František (referee)
Brassinosteroids (BRs) have been recognized to alleviate damages caused by drought stress and to enhance tolerance to water deficit. Soaking of maize kernels before the sowing in solution with different 24-epibrassinolide concentrations (especially the 10-8 M) had a positive effect on growth of plants before and after the stress period, although it did not affected relative water content and photosynthetic parameters. After the recovery under optimal conditions there were no differences among the treatments. When compared to spraying, soaking of maize kernels was not proved to have any advantages, though its positive effect on plants germination under water deficit conditions could be possible. Based on the results of the second season experiment it is not possible to deduce the role of exogenous BRs application (spraying with 24-epibrassinolide) or endogenous BRs biosynthesis (spraying with biosynthesis inhibitor - brassinazole) in maize plants subjected to water deficit. However, decrease in relative water content in contrast to chlorophylls content increase during the days following after drought stress onset in both cultivars (contrastive in drought sensitivity) challenges for further investigation of this problem. Understanding the role of BRs in plant drought tolerance and resistance is...
|
|
|
Role of brassinosteroids in plant response to drought stress
Trubanová, Nina ; Rothová, Olga (advisor) ; Urban, Milan (referee)
Brassinosteroids are steroid phytohormones with a wide range of effects. They improve survivance of plants exposed to drought stress, increase their resistence and yield therethrough. They regulate the response of plants directly (via synthesis of metabolits) and/or indirectly (via the induction of antioxidant compounds and enzymes), often in interaction with other phytohormones. Experiments studying influence of brassinosteroids on response of plants stressed with water deficit differ in several parameters. Their correct interpretation is complicated conseguently.
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