Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 64, Issue -, Pages 80-83Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2012.12.017
Keywords
Antioxidant; Scavenger; ROS; Environmental stress; Praline accumulation; Singlet oxygen
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Funding
- ANII (Uruguay)
- PEDECIBA (Uruguay)
- Spanish Ministry of Economy and Competitiveness
- Research Council of Norway
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Plants are commonly subjected to several environmental stresses that lead to an overproduction of reactive oxygen species (ROS). As plants accumulate proline in response to stress conditions, some authors have proposed that praline could act as a non-enzymatic antioxidant against ROS. One type of ROS aimed to be quenched by proline is singlet oxygen (O-1(2))-molecular oxygen in its lowest energy electronically excited state-constitutively generated in oxygenic, photosynthetic organisms. In this study we clearly prove that proline cannot quench O-1(2) in aqueous buffer, giving rise to a rethinking about the antioxidant role of proline against O-1(2). (C) 2013 Elsevier Masson SAS. All rights reserved.
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