Effects of UV-B radiation on photosynthesis and growth of terrestrial plants |
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Authors: | Alan H. Teramura Joe H. Sullivan |
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Affiliation: | (1) Department of Botany, University of Maryland, 20742 College Park, MD, USA;(2) Present address: College of Natural Sciences, University of Hawaii, 96822 Honolulu, HI, USA |
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Abstract: | The photosynthetic apparatus of some plant species appears to be well-protected from direct damage from UV-B radiation. Leaf optical properties of these species apparently minimizes exposure of sensitive targets to UV-B radiation. However, damage by UV-B radiation to Photosystem II and Rubisco has also been reported. Secondary effects of this damage may include reductions in photosynthetic capacity, RuBP regeneration and quantum yield. Furthermore, UV-B radiation may decrease the penetration of PAR, reduce photosynthetic and accessory pigments, impair stomatal function and alter canopy morphology, and thus indirectly retard photosynthetic carbon assimilation. Subsequently, UV-B radiation may limit productivity in many plant species. In addition to variability in sensitivity to UV-B radiation, the effects of UV-B radiation are further confounded by other environmental factors such as CO2, temperature, light and water or nutrient availability. Therefore, we need a better understanding of the mechanisms of tolerance to UV-B radiation and of the interaction between UV-B and other environmental factors in order to adequately assess the probable consequences of a change in solar radiation.Abbreviations Amax light and CO2 saturated rate of oxygen evolution - Ci internal CO2 concentration - Fv/Fm ratio of variable to total fluorescence yield - PAR photosynthetically active radiation (400–700 nm) - PS II Photosystem II - app apparent quantum yield of photosynthesis - SLW specific leaf weight - UV-B ultraviolet-B radiation between 290–320 nm |
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Keywords: | global climate change ozone depletion photosynthesis Photosystem II productivity UV-B radiation |
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