Abstract
Uncertainties about the response of plant physiology and growth to enhanced UV-B radiation cause uncertainty to predict how plant production will vary under future radiation change on the Tibetan Plateau. Here, we used a meta-analysis approach to test the influence of UV-B radiation on plant physiology and growth. This hypothesis was tested by investigating the response of plants, which was expressed by some measurable variables. Enhanced UV-B radiation decreased plant biomass, plant height, basal diameter, leaf area index, maximal PSII efficiency, and Chl a+b, but increased intercellular CO2 concentration, malondialdehyde (MDA), hydrogen peroxide, superoxide anion radical, peroxidase, ascorbate peroxidase, proline and UV-B absorbing compounds. The effect of enhanced UV-B radiation on net photosynthesis rate (P n ) increased with mean annual precipitation and experimental duration. The effect of enhanced UV-B radiation on MDA decreased with experimental duration. The effect of enhanced UV-B radiation on superoxide dismutase (SOD) increased with the magnitude of enhanced UV-B radiation. Forests rather than grasslands exhibited a positive response of SOD and a negative response of P n to enhanced UV-B radiation. Therefore, the effect of enhanced UV-B radiation on alpine plants varied with ecosystem types. Local climate conditions may regulate effects of enhanced UV-B radiation on alpine plants.
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Acknowledgements
We thank the editor and reviewers for their insightful and valuable comments, which greatly improved the quality of this manuscript. This work was funded by the National Natural Science Foundation of China (Nos. 31600432, 41171084), the National Key Research Projects of China (2016YFC0502005; 2016YFC0502006), Chinese Academy of Science Western Light Talents Program (Response of livestock carrying capability to climatic change and grazing in the alpine meadow of Northern Tibetan Plateau), the Science and Technology Plan Projects of Tibet Autonomous Region (Forage Grass Industry) and the National Science and Technology Plan Project of China (Nos. 2013BAC04B01, 2011BAC09B03, 2007BAC06B01).
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Communicated by A. K. Kononowicz.
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Fu, G., Shen, ZX. Effects of enhanced UV-B radiation on plant physiology and growth on the Tibetan Plateau: a meta-analysis. Acta Physiol Plant 39, 85 (2017). https://doi.org/10.1007/s11738-017-2387-8
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DOI: https://doi.org/10.1007/s11738-017-2387-8