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  • 1.
    Hideg, Éva
    et al.
    Pécs University, Pécs, Hungary.
    Jansen, Marcel A. K.
    University College of Cork, Cork, Ireland.
    Strid, Åke
    Örebro University, School of Science and Technology.
    UV-B exposure, ROS, and stress: inseparable companions or loosely linked associates?2013In: Trends in Plant Science, ISSN 1360-1385, E-ISSN 1878-4372, Vol. 18, no 2, p. 107-115Article in journal (Refereed)
    Abstract [en]

    Ultraviolet-B (UV-B) radiation has long been perceived as a stressor. However, a conceptual U-turn has taken place, and UV-B damage is now considered rare. We question whether UV-stress and UV-B-induced reactive oxygen species (ROS) are still relevant concepts, and if ROS-mediated signaling contributes to UV-B acclimation. Measurements of antioxidants and of antioxidant genes show that both low and high UV-B doses alter ROS metabolism. Yet, there is no evidence that ROS control gene expression under low UV-B. Instead, expression of antioxidant genes is linked to the UV RESISTANCE LOCUS 8 pathway. We hypothesize that low UVB doses cause ‘eustress’ (good stress) and that stimulispecific signaling pathways pre-dispose plants to a state of low alert that includes activation of antioxidant defenses.

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