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Review Article

Emir. J. Food Agric. 2012; 24(6): 546-556


Impact of UV-B radiation on photosynthesis ? an overview

Fernando J. C. Lidon1*
, Fernando H. Reboredo1
, Antó nio E. Leitã o2
, Maria Manuela A. Silva3
, Maria
Paula Duarte1 and José C. Ramalho2.

Abstract
Ultraviolet-B (UV-B) radiation constitutes a minor part of the solar spectrum, being most of this solar radiationabsorbed by the UV-screening stratospheric ozone layer. Yet, a global depletion of the ozone layer, largely dueto the release of chlorofluorocarbons caused by human activities, has resulted in an increase of solar UV-Bradiation at the earth's surface. Accordingly, in the temperate latitudes, such ozone decrease reached ca. 3% and6% in the North and South hemispheres, respectively, between 2002 and 2005 (as compared to the 1970s).Despite the uncertainty of long-term predictions, it is also estimated an UV-B increase of 5-10% over temperatelatitudes within the next 15 years In this context, this work aim at to present an overview of plantssensitivity/tolerance to UV-B irradiation mostly considering the key photosynthetic metabolism.

Key words: Ozone depletion, Photosynthesis, Reactive oxygen species, Ultraviolet-B radiation



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