Dose-dependent effects of 1O2 in chloroplasts are determined by its timing and localization of production
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2019-01-01
Publication Type
Journal Article
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yes
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Abstract
In plants, highly reactive singlet oxygen (¹O₂) is known to inhibit photosynthesis and to damage the cell as a cytotoxin. However, more recent studies have also proposed ¹O₂ as a signal. In plants under stress, not only ¹O₂ but also other reactive oxygen species (ROS) are generated simultaneously, thus making it difficult to link a particular response to the release of ¹O₂ and establish a signaling role for this ROS. This obstacle has been overcome by the identification of conditional mutants of Arabidopsis thaliana that selectively generate ¹O₂ and trigger various ¹O₂-mediated responses. In chloroplasts of these mutants, chlorophyll or its biosynthetic intermediates may act as a photosensitizer and generate ¹O₂. These ¹O₂-mediated responses are not only dependent on the dosage of ¹O₂ but also are determined by the timing and suborganellar localization of its production. This spatial- and temporal-dependent variability of ¹O₂-mediated responses emphasizes the importance of ¹O₂ as a highly versatile and short-lived signal that acts throughout the life cycle of a plant.
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published
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Journal / series
Volume
70 (1)
Pages / Article No.
29 - 40
Publisher
Oxford University Press
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Subject
Chloroplast; photosynthesis; reactive oxygen species; signaling; singlet oxygen; stress
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It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.