EN
Paper presents a review of the recent literature dealing with the UV-B radiation, its effect on physiological processes of plant growth and development, cellular changes, concentration of chemical compounds and changes in morphological plant traits. The reasons of increasing UV-B radiation level are rapidly developing civilization and decreasing of ozone layer. It was stated that the plant reaction to UV-B irradiation depends on plant species and environment conditions. Destructive effects of UV-B radiation to plants may be - to some extent-neutralized by defence mechanisms, a form of specific plant adaptation to stress, however, under conditions of strong UV-B irradiation such mechanisms are not sufficient.