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The effect of stress on basic urban environment ecophysiological characteristics on tree
 TONCAROVÁ, Gabriela
The subject of this bachelor thesis is the effect of stress on Platanus acerifolia which grows in different areas of the city. The first location is in the centrum of the city (Lannova třída) and the second location is in the city´s park in České Budějovice (Stromovka). There was a search of quantity of photosynthetic pigments and maximum of photochemical efficiency PS (photosystem) II. This search was conducted by a metod of measuring chlorophyll fluorescence and spectrophotometry. Samples of leaves from Platanus acerifolia were taken during growing season May to September. There were three trees chosen from each location and there were five leaves from each tree examined by metod of measuring chlorophyll fluorescence. The leaves were examined approximately at the same height and the examination was done at noon time. There were 150 leaves examined in total. There were four leaves of each tree used for a method of spectrophotometry. Those leaves were immediately taken to laboratory where the examination took place. There were 120 leaves used for this metod in total. The search showed that the more stressful environment Platanus acerifolia has a smaller content of photosynthetic pigments and photochemical efficiency of PS II decreases. Furthermore, the study showed that Platanus acerifolia belongs among relatively resistant trees. Values maximum photochemical efficiency of PS II and chlorophyll measured at both sites is almost statistically different. The statistical difference between the two sites were usually recorded at the beginning and end of the growing season.
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