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Wang, Liangsheng and Apel, Klaus (2019): Dose-dependent effects of O-1(2) in chloroplasts are determined by its timing and localization of production. In: Journal of Experimental Botany, Vol. 70, No. 1: pp. 29-40

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In plants, highly reactive singlet oxygen (O-1(2)) is known to inhibit photosynthesis and to damage the cell as a cytotoxin. However, more recent studies have also proposed O-1(2) as a signal. In plants under stress, not only O-1(2) but also other reactive oxygen species (ROS) are generated simultaneously, thus making it difficult to link a particular response to the release of O-1(2) 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 O-1(2) and trigger various O-1(2)-mediated responses. In chloroplasts of these mutants, chlorophyll or its biosynthetic intermediates may act as a photosensitizer and generate O-1(2). These O-1(2)-mediated responses are not only dependent on the dosage of O-1(2) but also are determined by the timing and suborganellar localization of its production. This spatial- and temporal-dependent variability of O-1(2)-mediated responses emphasizes the importance of O-1(2) as a highly versatile and short-lived signal that acts throughout the life cycle of a plant.

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