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EFFECT OF CHROMIUM(VI) ON PHOTOSYSTEM II ACTIVITY AND HETEROGENEITY OF SYNECHOCYSTIS SP. (CYANOPHYTA): STUDIED WITH IN VIVO CHLOROPHYLL FLUORESCENCE TESTS 1
Author(s) -
Pan Xiangliang,
Chen Xi,
Zhang Daoyong,
Wang Jianlong,
Deng Chunnuan,
Mu Guijin,
Zhu Huaisong
Publication year - 2009
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.2009.00647.x
Subject(s) - photosystem ii , photosynthesis , chromium , biology , chlorophyll fluorescence , fluorescence , chlorophyll , electron transport chain , chlorophyll a , manganese , photochemistry , botany , biophysics , materials science , chemistry , physics , quantum mechanics , metallurgy
The inhibitory effect of Cr(VI) on the PSII of Synechocystis sp. was studied. Cr(VI) reduced O 2 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 (PSII X ) and PSII β reaction centers, which increased the fluxes of dissipated energy. JIP test and Q A − reoxidation test demonstrated that Cr(VI) treatment induces inhibition of electron transport from Q A − to Q B /Q B − and accumulation of P 680 + . More Q A − had to be oxidized through S 2 (Q A Q B ) − charge recombination and oxidation by PQ9 molecules in PSII under Cr(VI) stress. These changes finally decreased the index of photosynthesis performance.