UV-A radiation effects on higher plants: exploring the known unknown

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Verdaguer, Dolors
Jansen, Marcel A. K.
Llorens, Laura
Morales, Luis O.
Neugart, Susanne
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Ultraviolet-A radiation (UV-A: 315–400 nm) is a component of solar radiation that exerts a wide range of physiological responses in plants. Currently, field attenuation experiments are the most reliable source of information on the effects of UV-A. Common plant responses to UV-A include both inhibitory and stimulatory effects on biomass accumulation and morphology. UV-A effects on biomass accumulation can differ from those on root: shoot ratio, and distinct responses are described for different leaf tissues. Inhibitory and enhancing effects of UV-A on photosynthesis are also analysed, as well as activation of photoprotective responses, including UV-absorbing pigments. UV-A-induced leaf flavonoids are highly compound-specific and species-dependent. Many of the effects on growth and development exerted by UV-A are distinct to those triggered by UV-B and vary considerably in terms of the direction the response takes. Such differences may reflect diverse UV-perception mechanisms with multiple photoreceptors operating in the UV-A range and/or variations in the experimental approaches used. This review highlights a role that various photoreceptors (UVR8, phototropins, phytochromes and cryptochromes) may play in plant responses to UV-A when dose, wavelength and other conditions are taken into account.
Ultraviolet-A , Plant biomass , Morphology , Photosynthesis , Photodamage , Phenolics
Verdaguer, D., Jansen, M. A. K., Llorens, L., Morales, L. O. and Neugart, S. (2017) 'UV-A radiation effects on higher plants: Exploring the known unknown', Plant Science, 255, pp. 72-81. doi:10.1016/j.plantsci.2016.11.014