Antioxidant Responses Induced by UVB Radiation in Deschampsia antarctica Desv.

Abstract

Deschampsia antarctica Desv. is one of two vascular plants that live in the Maritime Antarctic Territory and is exposed to high levels of ultraviolet-B (UVB) radiation. In this work, antioxidant physiology of D. antarctica was studied in response to UVB induced oxidative changes. Samples were collected from Antarctica and maintained in vitro culture during 2 years. Plants were sub-cultured in a hydroponic system and exposed to 21.4 kJ m −2 day −1 , emulating summer Antarctic conditions. Results showed rapid and significant increases in reactive oxygen species (ROS) at 3 h, which rapidly decreased. No dramatic changes were observed in photosynthetic efficiency, chlorophyll content, and level of thiobarbituric acid reactive species (MDA). The enzymatic (superoxide dismutase, SOD and total peroxidases, POD) and non-enzymatic antioxidant activity (total phenolic) increased significantly in response to UVB treatment. These findings suggest that tolerance of D. antarctica to UVB radiation could be attributed to its ability to activate both enzymatic and non-enzymatic antioxidant systems.

UV radiation increases phenolic compound protection but decreases reproduction in Silene littorea

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Linkages between stratospheric ozone, UV radiation and climate change and their implications for terrestrial ecosystems

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Uvb Exposure Induced Accumulation of Phenolics And Resveratrol and Enhanced Antioxidant Activities In Peanut Sprouts

“…To our knowledge, no information has been reported on the effect of UVB exposure on the antioxidant activity in seed sprouts, but previous studies found the antioxidant activity of tobacco leaves enhanced after the plants were treated with UVB (Shen et al, 2017) and the antioxidant activity in the plants, Deschampsia antarctica Desv. enhanced after 3 h of exposure to UVB (Köhler et al, 2017). Post-harvest UVB exposure also increased antioxidant activities of whole, sliced and peeled carrots (Avena-Bustillos et al, 2012;Surjadinata et al, 2017).…”