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UV-Induced Effects on Growth, Photosynthetic Performance and Sunscreen Contents in Different Populations of the Green Alga Klebsormidium fluitans (Streptophyta) from Alpine Soil Crusts

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Abstract

Members of the green algal genus Klebsormidium (Klebsormidiales, Streptophyta) are typical components of biological soil crust communities worldwide, which exert important ecological functions. Klebsormidium fluitans (F. Gay) Lokhorst was isolated from an aeroterrestrial biofilm as well as from four different biological soil crusts along an elevational gradient between 600 and 2350 m in the Tyrolean and South Tyrolean Alps (Austria, Italy), which are characterised by seasonally high solar radiation. Since the UV tolerance of Klebsormidium has not been studied in detail, an ecophysiological and biochemical study was applied. The effects of controlled artificial ultraviolet radiation (UVR; <9 W m–2 UV-A, <0.5 W m–2 UV-B) on growth, photosynthetic performance and the capability to synthesise mycosporine-like amino acids (MAAs) as potential sunscreen compounds were comparatively investigated to evaluate physiological plasticity and possible ecotypic differentiation within this Klebsormidium species. Already under control conditions, the isolates showed significantly different growth rates ranging from 0.42 to 0.74 μm day−1. The UVR effects on growth were isolate specific, with only two strains affected by the UV treatments. Although all photosynthetic and respiratory data indicated strain-specific differences under control conditions, UV-A and UV-B treatment led only to rather minor effects. All physiological results clearly point to a high UV tolerance in the K. fluitans strains studied, which can be explained by their biochemical capability to synthesize and accumulate a putative MAA after exposure to UV-A and UV-B. Using HPLC, a UV-absorbing compound with an absorption maximum at 324 nm could be identified in all strains. The steady-state concentrations of this Klebsormidium MAA under control conditions ranged from 0.09 to 0.93 mg g−1 dry weight (DW). While UV-A led to a slight stimulation of MAA accumulation, exposure to UV-B was accompanied by a strong but strain-specific increase of this compound (5.34–12.02 mg−1 DW), thus supporting its function as UV sunscreen. Although ecotypic differences in the UVR response patterns of the five K. fluitans strains occurred, this did not correlate with the altitude of the respective sampling location. All data indicate a generally high UV tolerance which surely contributes to the aeroterrestrial lifestyle of K. fluitans in soil crusts of the alpine regions of the European Alps.

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Acknowledgments

Financial support by the Deutsche Forschungsgemeinschaft (DFG) (KA899/16-1/2/3/4) is gratefully acknowledged by U.K.

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  1. Institute of Biological Sciences, Applied Ecology and Phycology, University of Rostock, Albert-Einstein-Strasse 3, 18057, Rostock, Germany

    C. Kitzing, T. Pröschold & U. Karsten

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Kitzing, C., Pröschold, T. & Karsten, U. UV-Induced Effects on Growth, Photosynthetic Performance and Sunscreen Contents in Different Populations of the Green Alga Klebsormidium fluitans (Streptophyta) from Alpine Soil Crusts. Microb Ecol 67, 327–340 (2014). https://doi.org/10.1007/s00248-013-0317-x

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