Proline does not quench singlet oxygen: evidence to reconsider its protective role in plants.

Santiago Signorelli, Juan Bautista Arellano, Thor Bernt Melø, Omar Borsani, Jorge Monza

Laboratorio de Bioquímica, Departamento de Biología Vegetal, Facultad de Agronomía, Universidad de la República, Av. E. Garzón 780, CP 12900 Montevideo, Uruguay. ssignorelli@fagro.edu.uy

Plant physiology and biochemistry : PPB / Société française de physiologie végétale 2013 Mar

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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 proline could act as a non-enzymatic antioxidant against ROS. One type of ROS aimed to be quenched by proline is singlet oxygen ((1)O(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 (1)O(2) in aqueous buffer, giving rise to a rethinking about the antioxidant role of proline against (1)O(2). Copyright © 2013 Elsevier Masson SAS. All rights reserved.

Citation

Santiago Signorelli, Juan Bautista Arellano, Thor Bernt Melø, Omar Borsani, Jorge Monza. Proline does not quench singlet oxygen: evidence to reconsider its protective role in plants. Plant physiology and biochemistry : PPB / Société française de physiologie végétale. 2013 Mar;64:80-3