UV-B exposure, ROS, and stress [Elektronisk resurs] inseparable companions or loosely linked associates?

• 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. 

Ämnesord

Natural Sciences  (hsv)

Biological Sciences  (hsv)

Botany  (hsv)

Naturvetenskap  (hsv)

Biologiska vetenskaper  (hsv)

Botanik  (hsv)

Biochemistry and Molecular Biology  (hsv)

Biokemi och molekylärbiologi  (hsv)

Biokemi  (oru)

Biochemistry  (oru)

Indexterm och SAB-rubrik

UV-B; stress

ROS

antioxidant

acclimation

signaling