UV-B exposure, ROS, and stress: Inseparable companions or loosely linked associates?

Éva Hideg, Marcel A.K. Jansen, Åke Strid

Research output: Contribution to journalReview article

255 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)107-115
Number of pages9
JournalTrends in Plant Science
Volume18
Issue number2
DOIs
Publication statusPublished - Feb 1 2013

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Keywords

  • Acclimation
  • Antioxidant
  • ROS
  • Signaling
  • Stress
  • UV-B

ASJC Scopus subject areas

  • Plant Science

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