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Photosynthetica

, Volume 52, Issue 1, pp 36–49 | Cite as

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

  • R. Hui
  • X. R. Li
  • R. L. Jia
  • L. C. Liu
  • R. M. Zhao
  • X. Zhao
  • Y. P. Wei
Original Paper

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.

Additional key words

biological soil crusts chlorophyll a fluorescence photosynthesis ultraviolet-B 

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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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • R. Hui
    • 1
    • 2
  • X. R. Li
    • 1
    • 2
  • R. L. Jia
    • 1
    • 2
  • L. C. Liu
    • 1
    • 2
  • R. M. Zhao
    • 3
  • X. Zhao
    • 1
    • 2
  • Y. P. Wei
    • 4
  1. 1.Shapotou Desert Research and Experimental Station, Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhouP.R. China
  2. 2.Extreme Stress Resistance and Biotechnology Laboratory, Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhouP.R. China
  3. 3.College of Life Science and TechnologyGansu Agricultural UniversityLanzhouP.R. China
  4. 4.Australian-China Center on Water Resource ResearchThe University of MelbourneParkville, VictoriaAustralia

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