INFLUENCE OF NIGHTTIME UV-B IRRADIATION ON THE COMPOSITION OF HEALTH-PROMOTING PHYTOCHEMICALS IN ROCKET (ERUCA SATIVA MILL.)
The present experiment was carried out with the aim to investigate the effects of a one-time UV-B irradiation treatment at night onto the secondary metabolism of Rocket (Eruca sativa Mill.). As measurement parameters for the potential UV-B induced effects, glucosinolates and flavonoids were used as phytochemicals. Forty-two days old rocket plants were applied with three different UV-B irradiation levels at midnight for 135 min. After an adaptation time of 32 h the plants were harvested. With the exception of indolyl-glucosinolat 4-methoxy-glucobrassicin, no significant differences were proven on the glucosinolat concentration. Independently from the irradiation level the significant enhancement of 4 methoxyglucobrassicin amounted to approximately 70%. A significant rise after the treatment for the concentration of the flavonoids quercetin and kaempferol could be shown only in one of four examined tests. A significant increase of kaempferol concentration could be proven between the control plants and the plants with the highest applied UV-B irradiation intensity in one test. In another test a significant increase of the quercetin concentration was found in plants with the lowest applied UV-B irradiation treatment. The results show, that a one-time UV-B irradiation treatment at night can influence the synthesis of phytochemicals.
Scharff, C., Domurath , N., Schröder , F.-G., Spangenberg, P., Schreiner , M. and Krumbein, A. (2012). INFLUENCE OF NIGHTTIME UV-B IRRADIATION ON THE COMPOSITION OF HEALTH-PROMOTING PHYTOCHEMICALS IN ROCKET (ERUCA SATIVA MILL.). Acta Hortic. 932, 263-269
Brassicaceae, glucosinolates, flavonoids, secondary metabolism, UV-radiation