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Combined effect of future climate and UV-B radiaton on garden lettuce
Date Issued |
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2019 |
Climate change, apart from direct effects on living organisms, may change their sensitivity to other environmental factors. This study was designed to investigate the shift of UV-B resistance of leafy vegetables at current and future climate. The garden lettuce (Lactuca sativa L. “Grand rapids”), garden rocket (Eruca sativa Mill. „Rucola“) and spinach (Spinacia oleracea L., „Emilia H“) were grown in pots in Phytotron growth chambers under current (21.5/16 °C day/night temperature, 800 ppm CO2) and future climate (CC and FC, respectively) conditions with and without additional UV-B radiation (0 vs. 6 kJ/ m-2 d -1 ). FC conditions corresponded RCP 6 and RCP 8: 23.5/18 °C day/night temperature, 800 ppm CO2 and 26.5/20 °C day/night temperature, 800 ppm CO2, respectively. UV-B radiation under the current climate stimulated plants growth, it was especially obvious in spinach (51% increase in dry above-ground biomass and 76% increase in leaf area). Increase in photosynthetic pigments concentrations and reduction of membrane oxidative damage was also detected in all investigated plant species. Future climate positively affected plants growth, and physiological parameters; however, tended to reduce their resistance to UV-B radiation. UV-B reduced shoot height of all investigated species under FC conditions. The strongest UVB induced reduction in leaf area, and dry above-ground biomass were detected in garden lettuce (49 % and 31%, respectively), nevertheless these vegetables maintained low leave MDA concentration under combined FC and UV-B treatment. In contrast, dry biomass and leaf area were little affected by UV-B under FC conditions in both garden rocket and spinach. However, oxidative damage was increased due to UV-B radiation in the leaves of these plants, grown under FC (RCP 8) conditions.