The role of photochemical quenching and antioxidants in photoprotection of Deschampsia antarctica

Functional Plant Biology : FPB
Eduardo Pérez-TorresLeónA Bravo

Abstract

Deschampsia antarctica Desv. (Poaceae) is the only grass that grows in the maritime Antarctic. Constant low temperatures and episodes of high light are typical conditions during the growing season at this latitude. These factors enhance the formation of active oxygen species and may cause photoinhibition. Therefore, an efficient mechanism of energy dissipation and / or scavenging of reactive oxygen species (ROS) would contribute to survival in this harsh environment. In this paper, non-acclimated and cold-acclimated D. antarctica were subjected to high light and / or low temperature for 24 h. The contribution of non-photochemical dissipation of excitation light energy and the activities of detoxifying enzymes in the development of resistance to chilling induced photoinhibition were studied by monitoring PSII fluorescence, total soluble antioxidants, and pigments contents and measuring variations in activity of superoxide dismutase (SOD; EC 1.15.1.1), ascorbate peroxidase (APX; EC 1.11.1.11), and glutathione reductase (GR; EC 1.6.4.2). The photochemical efficiency of PSII, measured as Fv / F m, and the yield of PSII electron transport (ΦPSII) both decreased under high light and low temperatures. In contrast, photochemical quench...Continue Reading

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Citations

Jun 16, 2009·Journal of Integrative Plant Biology·Grazyna Bystrzejewska-Piotrowska, Pawel L Urban
Sep 13, 2017·Oxidative Medicine and Cellular Longevity·Ana Ortiz-EspínFrancisca Sevilla
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Jul 15, 2015·Environmental Science and Pollution Research International·Jiazhi ZhangXiaohua Huang
Oct 10, 2020·Photosynthesis Research·Alicia Victoria Perera-CastroBeatriz Fernández-Marín

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Methods Mentioned

BETA
environmental stress

Software Mentioned

SPSS
Beckman System Gold
Sigma Stat

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