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EFFECT OF CHROMIUM(VI) ON PHOTOSYSTEM II ACTIVITY AND HETEROGENEITY OF SYNECHOCYSTIS SP. (CYANOPHYTA): STUDIED WITH IN VIVO CHLOROPHYLL FLUORESCENCE TESTS1

Authors

  • Xiangliang Pan,

    1. Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
      State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
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  • Xi Chen,

    1. Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
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  • Daoyong Zhang,

    1. Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
      State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
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  • Jianlong Wang,

    1. Institute of Nuclear Energy Technology, Tsinghua University, Beijing, 100083, China
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  • Chunnuan Deng,

    1. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130012, China
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  • Guijin Mu,

    1. Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
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  • Huaisong Zhu

    1. Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
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  • 1

    Received 10 July 2008. Accepted 21 November 2008.

Abstract

The inhibitory effect of Cr(VI) on the PSII of Synechocystis sp. was studied. Cr(VI) reduced O2 evolution and inhibited the water-splitting system in PSII. S-states test and flash induction test showed that Cr(VI) exposure increased the proportion of inactivated PSII (PSIIX) and PSIIβ reaction centers, which increased the fluxes of dissipated energy. JIP test and QA reoxidation test demonstrated that Cr(VI) treatment induces inhibition of electron transport from QA to QB/QB and accumulation of P680+. More QA had to be oxidized through S2(QAQB) charge recombination and oxidation by PQ9 molecules in PSII under Cr(VI) stress. These changes finally decreased the index of photosynthesis performance.

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