EN
The paper discusses a possible influence on the production of secondary metabolites - the flavonoids, by the method of elicitation in the callus cultures of Ononis arvensis L., the elicitor employed being the UV 254 and 366 nm and the sun-lamp. In some cases there was an increase in the production of flavonoids particularly 60, 120, 240 and 300 s after sun-lamp irradiation and in case of 15 and 30 min irradiation with UV-254 nm.