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

Santiago Signorelli, J.B. B. Arellano, T.B. B. Melø, O. Borsani, J. Monza

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64 Citations (Scopus)


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 (1O2)-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 1O2 in aqueous buffer, giving rise to a rethinking about the antioxidant role of proline against 1O2. © 2013 Elsevier Masson SAS.
Original languageEnglish
Pages (from-to)80-83
Number of pages4
JournalPlant Physiology and Biochemistry
Publication statusPublished - 2013
Externally publishedYes

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