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SAJBIDOROVA VIERA, LICHTNEROVA HELENA, PAGANOVA VIERA. 2015. The Impact of Diff erent Water Regime on Chlorophyll Fluorescence of Pyrus pyraster L. and Sorbus domestica L. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 63(5): 1575–1579. The water defi cit is considered to be signifi cant cause of photosynthesis defects. Measuring of chlorophyll fl uorescence is one of the methods revealing defects in the photosynthetic apparatus. The experiment was established with two woody plant (Pyrus pyraster L. and Sorbus domestica L.) cultivated in two diff erent regimes of the substrate saturation. The measurement of the modulated fl uorescence of chlorophyll a was done by FMS1 fl uorometer during three-week period between June and September (2012 and 2013). There were analysed selected parameters of chlorophyll fl uorescence: Fv/Fm – maximum quantum effi ciency of PSII, PSII – eff ective quantum yield of PSII and RFD – chlorophyll fl uorescence decrease ratio. According to the obtained results, Pyrus pyraster has probably higher potential for adaptation to water defi ciency. There were recorded the signifi cant decreases mainly in the values of parameter RFD and PSII for Sorbus domestica within duration of experiment with diff erent water regime in both growing seasons 2012 and 2013. The results document a weak sensitivity of the parameter Fv/Fm on changes in the amount of available water in the substrate in both taxa.

The Impact of Different Water Regime on Chlorophyll Fluorescence of Pyrus pyraster L. and Sorbus domestica L.