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Photosynthesis of two moss crusts from the Tengger Desert with contrasting sensitivity to supplementary UV-B radiation

  • Original Paper
  • Published:
Photosynthetica

Abstract

Predicting the effects of increased ultraviolet-B (UV-B) radiation due to stratospheric ozone depletion on temperate desert ecosystems requires better knowledge of the ecophysiological response of common moss species. The aim of the current work was to determine whether elevated UV-B radiation affected photosynthetic performance and chloroplast ultrastructure of two moss crusts and whether response differences were observed between the crusts. In laboratory experiments, Bryum argenteum and Didymodon vinealis, which show microdistributions and are dominant in soil crusts at the Tengger Desert, Northern China, were subjected to four levels of UV-B radiation of 2.75 (control), 3.08, 3.25, and 3.41 W m−2 for 10 days, simulating 0, 6, 9, and 12% of stratospheric ozone at the latitude of Shapotou, respectively. The results showed that chlorophyll a fluorescence parameters (i.e., the maximal quantum yield of PSII photochemistry, the effective quantum yield of PSII photochemistry, and photochemical quenching coefficient), pigment contents, soluble protein contents, and the ultrastructure were negatively influenced by elevated UV-B radiation and the degree of detrimental effects significantly increased with the intensity of UV-B radiation. Moreover, results indicated that B. argenteum was probably more sensitive to supplementary UV-B radiation than D. vinealis. Therefore, we propose the use of B. argenteum crusts as a bioindicator of responses to elevated UV-B radiation.

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Abbreviations

BSC:

biological soil crusts

Car:

carotenoids

Chl:

chlorophyll

DE:

days of exposure

F0 :

the minimal fluorescence of dark-adapted state

Fm :

the maximal fluorescence of dark-adapted state

Fv/Fm :

the maximal quantum yield of PSII photochemistry

·OH:

hydroxyl radicals

O2 ·− :

superoxide anions

PAL:

phenylalanine ammonia-lyase

PSII:

photosystem II

qP :

photochemical quenching coefficient

ROS:

reactive oxygen species

Rubisco:

ribulose-1,5-bisphosphate carboxylase/oxygenase

TEM:

transmission electron microscope

UV-B:

ultraviolet-B

ΦPSII :

the effective quantum yield of PSII photochemistry

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Authors and Affiliations

  1. Shapotou Desert Research and Experimental Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, P.R. China

    R. Hui, X. R. Li, R. L. Jia, L. C. Liu & X. Zhao

  2. Extreme Stress Resistance and Biotechnology Laboratory, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, P.R. China

    R. Hui, X. R. Li, R. L. Jia, L. C. Liu & X. Zhao

  3. College of Life Science and Technology, Gansu Agricultural University, Lanzhou, 730070, P.R. China

    R. M. Zhao

  4. Australian-China Center on Water Resource Research, The University of Melbourne, Parkville, Victoria, 3010, Australia

    Y. P. Wei

Authors
  1. R. Hui
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  2. X. R. Li
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  3. R. L. Jia
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  4. L. C. Liu
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  5. R. M. Zhao
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  6. X. Zhao
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  7. Y. P. Wei
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Corresponding author

Correspondence to X. R. Li.

Additional information

Acknowledgements: This study was financially supported by one of National Basic Research Program of China (No. 2013CB429906) and by the National Natural Science Foundation of China (No. 41271061).

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Hui, R., Li, X.R., Jia, R.L. et al. Photosynthesis of two moss crusts from the Tengger Desert with contrasting sensitivity to supplementary UV-B radiation. Photosynthetica 52, 36–49 (2014). https://doi.org/10.1007/s11099-014-0003-3

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  • DOI: https://doi.org/10.1007/s11099-014-0003-3

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