期刊
TRENDS IN PLANT SCIENCE
卷 18, 期 2, 页码 107-115出版社
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tplants.2012.09.003
关键词
UV-B; stress; ROS; antioxidant; acclimation; signaling
资金
- COST
- COST Action [FA0906]
- UV4Growth
- Faculty of Business, Science, and Technology at Orebro University
- Science Foundation Ireland (SFI) [11/RFP.1/EOB/3303]
- Hungarian Scientific Research Fund [OTKA NN-85349]
- Science Foundation Ireland (SFI) [11/RFP.1/EOB/3303] Funding Source: Science Foundation Ireland (SFI)
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 UV-B doses cause 'eustress' (good stress) and that stimuli-specific signaling pathways pre-dispose plants to a state of low alert that includes activation of antioxidant defenses.
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