The experiment on Zea mays L. cv. Landmark (F1) plants was performed in a greenhouse with UV-B (305–315 nm).
The pots with plants were divided into four groups: the first and the second groups were grown, respectively, at
low (1.0 kJ m -2 d -1 ) and high (3.0 kJ m -2 d -1 ) biological effective dose of UV-B radiation. Half of the pots of each
group were sprayed with 0.1% solution of Asahi SL (the third and fourth groups). The intensity of photosynthe-
sis and transpiration, chlorophyll fluorescence, the content of UV-absorbing compounds and radical scavenging
activity were measured using DPPH after four and six weeks of UV-B radiation. After six weeks of irradiation with
a higher UV-B dose both flavonoid content and antioxidant activity increased by 112% and by 44%, respectively,
compared to the plants grown at the lower dose. The plants treated with Asahi SL and exposed to the high dose
of UV-B had the content of flavonoids 80% higher than the control ones. Asahi SL decreased scavenging activity
in both groups of plants by 17% and 32%, respectively, in comparison with the untreated plants. The intensity
of net photosynthesis, the transpiration rate and chlorophyll fluorescence parameters (Fv/Fo, ETR, Rfd) did not
differ in most of variants.
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