Journal of Bioenergetics and Biomembranes

, Volume 44, Issue 3, pp 365–372 | Cite as

Role of chloride ion in hydroxyl radical production in photosystem II under heat stress: Electron paramagnetic resonance spin-trapping study

  • Deepak Kumar Yadav
  • Pavel PospíšilEmail author


Hydroxyl radical (HO) production in photosystem II (PSII) was studied by electron paramagnetic resonance (EPR) spin-trapping technique. It is demonstrated here that the exposure of PSII membranes to heat stress (40 °C) results in HO formation, as monitored by the formation of EMPO-OH adduct EPR signal. The presence of different exogenous halides significantly suppressed the EMPO-OH adduct EPR signal in PSII membranes under heat stress. The addition of exogenous acetate and blocker of chloride channel suppressed the EMPO-OH adduct EPR signal, whereas the blocker of calcium channel did not affect the EMPO-OH adduct EPR signal. Heat-induced hydrogen peroxide (H2O2) production was studied by amplex red fluorescent assay. The presence of exogenous halides, acetate and chloride blocker showed the suppression of H2O2 production in PSII membranes under heat stress. Based on our results, it is proposed that the formation of HO under heat stress is linked to uncontrolled accessibility of water to the water-splitting manganese complex caused by the release of chloride ion on the electron donor side of PSII. Uncontrolled water accessibility to the water-splitting manganese complex causes the formation of H2O2 due to improper water oxidation, which leads to the formation of HO via the Fenton reaction under heat stress.


Photosystem II Electron paramagnetic resonance Hydroxyl radical Spin trap Heat stress Chloride ion Hydrogen peroxide Amplex red 


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© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Department of Biophysics, Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of SciencePalacký UniversityOlomoucCzech Republic

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