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The aim of this study is to assess the potential of prolonged UV irradiation to induce genotoxic alteration in Poaceae species cultivated in laboratory and in mountain conditions. Changes in natural environment increase to a great extent with altitude. In natural ecosystems plants are exposed to UV and other environmental factors for more than one period of time of 10, 20, 30 or 43 days. Four wild species: Poa alpina L., Sesleria coerulans Friv., Festuca valida (R. Uechtr.) Pénzes, Dactylis glomerata L., characteristic of the ecosystems in Rila Mountain at three different altitudes (1500m, 1782m, and 2925m) were collected in three successive growing seasons (2017, 2018, 2019). Five-days old model plant Hordeum vulgare L. was cultivated and exposed to UV irradiation in laboratory conditions for periods of 10, 20, 30 and 43 days. Induction of micronuclei was applied as endpoint. We propose that: i) prolonged irradiation as well as its increase with altitude could induce higher genotoxic injuries in plants; ii) wild plants in mountainous and alpine biotopes are well adapted to the environmental conditions where a combination of abiotic stress factors can occur. Our results show variability in the response to UV irradiation between plant species cultivated in laboratory conditions and wild plants in natural environment where UV is combined with other abiotic stress factors. Micronuclei induced in H. vulgare in laboratory conditions were with higher frequency than those in plants growing in mountain conditions. It could be due to the fact that in laboratory conditions we studied the effect of a single factor and for a limited period of time, while in the natural environment the effect of prolonged UV irradiation is combined with other abiotic stress factors. Plant species at the highest altitude of 2925 m had a well pronounced low level of damage, despite expected high level of damage. It is well known that plants’ response is modified when the effect of UV irradiation is combined with other factors. Further studies are needed for better understanding the mechanisms of interaction between factors and plant responses to the changing environmental conditions. Based on this and on future monitoring studies it could be possible to select sensitive monitor/model Poaceae species for the following comparative environmental impact assessments in laboratory and in mountain conditions.

INDUCTION OF MICRONUCLEI AFTER PROLONGED UV IRRADIATION OF POACEAE SPECIES CULTIVATED IN LABORATORY CONDITIONS AND WILD-GROWING IN RILA MOUNTAIN