Search for: [Abstract = "Impact of UV\-B irradiation on chlorophyll content and chlorophyll fluorescence of two dwarf shrub species\: Vaccinium myrtillus L. and Vaccinium vitis\-idaea L. was investigated. The plants originating from different latitudes were used. The experiment was carried out in the greenhouse. Three variants of ultraviolet\-B irradiation were applied\: control = 0, lower dose = 11.32 and higher dose = 22.64 kJ m\-2 day\-1 UV\-BBE \(biologically effective dose of UV\-B\). Measurements of chlorophyll fluorescence and chlorophyll content were carried out. The response of dwarf shrubs to the increased UV\-B radiation depended on UV\-B dose, species traits and provenance. Vaccinium vitis\-idaea was less sensitive to UV\-B than Vaccinium myrtillus. The permanent discoloration was observed only on Vaccinium myrtillus leaves. The leaf bud break of this species was accelerated at high UV\-B dose compared to the control. The UV\-B radiation influenced its photosynthetic apparatus\: the chlorophyll content in leaves was reduced, the maximal and the steady state fluorescence of chlorophyll were diminished. The chlorophyll content in leaves of Vaccinium vitis\-idaea did not change significantly but the relative vitality index and the steady state fluorescence were modified under the influence of the radiation."]

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