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Autumn leaf senescence in temperate and boreal woody species under changing climate
Kosová, Barbora ; Lhotáková, Zuzana (advisor) ; Konrádová, Hana (referee)
Autumn senescence of the foliage of deciduous trees of temperate and boreal zones is an annually recurring phenological phenomenon, which is part of the adaptation to life in the temperate and boreal zones with periods of frost and restriction of solar radiation. During foliar senescence, photosynthetic pigments decompose, mineral nutrients are remobilized and foliage falls off. The timing of foliage senescence in boreal and temperate deciduous trees is controlled by external and internal factors. The biggest role in the timing of senescence is played by photoperiod and temperature, which gradually decrease by he end of the growing season. The temperature is increasing due to global warming, thus affecting the length of the growing season and the sequestration of carbon into forest stands. Other factors (such as water availability) are also affected by climate change. The above-mentioned factors affect the trees of boreal and temperate forests to varying degrees, and it is, therefore, important to address them in order to be able to estimate the future development of foliage senescence and carbon sequestration in temperate and boreal forests.
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Influence of leaf age on the Rubisco content
Matulková, Zuzana ; Zemanová, Jana (referee) ; Hrstka, Miroslav (advisor)
The bachelor’s thesis describes the influence of leaf senescence on the Rubisco enzyme content in Fagus sylvatica, grown both in normal and elevated athmospheric carbon dioxide concentration. Tha samples were collected at the Station of experimental ecology, Institute of systems biology and ecology, Academy of Sciences of the Czech Republic, White Cross in Moravian-Silesian Beskydy. To specify the determination three series of samples were taken in following order - the first one on 22nd May 2007, the second one on 24th July 2007, and the third one then on 4th September 2007.The Rubisco enzyme content in leafs was measured by the SDS-PAGE method. In Fagus species grown in elevated carbon dioxide concentration we observed the depression of Rubisco enzyme content during the vegetation period. Reversely in Fagus species grown in normal carbon dioxide concentration the Rubisco enzyme content was increasing.
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