THE EFFECT OF ACUTE UV RADIATION ON BARLEY PRODUCTIVITY UNDER DIFFERENT GROWING CONDITIONS
DOI:
https://doi.org/10.31857/2500-2082/2022/4/9-13Keywords:
ultraviolet (A B) irradiation, barley, malondialdehyde, flavonoids, chlorophyll fluorescence, grain harvest, biomassAbstract
The results of field and vegetation experiments on the effect of acute UV (A+B) irradiation on barley (Hordeum vulgare L.) are presented. 20% depletion of the ozone layer was simulated, the daily additional dose of UV-A radiation was 58 kJ/m2, UV-B – 12 kJ/m2. In the vegetation experiment, a decrease in grain productivity indicators was revealed: the grain yield from the plant and the mass of 1000 grains by 1.5 times and 1.1 times, respectively, the height of the plant and dry biomass by an average of 1.2 times relative to the control. It also revealed a significant increase in the content of flavonoids in barley leaves by 1.2 times and a significant decrease in the content of MDA in cell membranes by 1.5 times relative to the control. Immediately after irradiation, photosynthetic parameters of chlorophyll fluorescence Fv/Fm and Y(II) decreased by 1.4 times and 1.3 times relative to the control, respectively. The data obtained 30 days after irradiation showed that the damaged components of FS II have mechanisms for repairing damage caused by the influence of UV radiation. In the field experiment, a significant decrease in height by 1.1 times and grain yield from the plant by 1.4 times relative to the control was found, an unreliable decrease in the mass of 1000 grains by 1.2 times and dry biomass by 1.4 times was also observed.
