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Photosynthesis Research

, Volume 93, Issue 1–3, pp 123–132 | Cite as

Differential response of chloride binding sites to elevated temperature: a comparative study in spinach thylakoids and PSII-enriched membranes

  • Arjun Tiwari
  • Anjana Jajoo
  • Sudhakar Bharti
  • Prasanna Mohanty
Regular Paper

Abstract

A study of heat effects was performed in thylakoids and photosystem II (PSII)-enriched membranes isolated from spinach in relation to Cl-induced activation of PSII catalyzed oxygen evolution and the retention of Cl in the PSII complex. For this, Cl-sufficient membranes and low-Cl membranes were used. The presence of Cl in the reaction medium did accelerate oxygen evolution, which remained unaffected by heat treatment up to 40°C in PSII membranes and up to 42.5°C in thylakoids. Heat resistance of Cl-induced activation of oxygen evolution was found to be independent of the presence of ‘bound Cl’ in the preparations. However, the functional stability of the PSII complex during heat treatment showed a marked dependence on the presence of bound Cl in PSII. Electron paramagnetic resonance study of manganese (Mn) release per reaction center/Y D + showed that there was little loss of Mn2+ up to 42°C in our preparations, although the PSII activity was significantly lowered. These observations together with data from steady state chlorophyll a fluorescence imply that the site of action of Cl causing direct activation of oxygen evolution was different from the site of primary heat damage. A differential response of chloride binding sites to heat stress was observed. The high-affinity (tightly bound, slow exchanging) site of chloride is affected earlier (∼37°C) while low-affinity (loosely bound, fast exchanging) site gets affected at higher temperatures (42.5°C in thylakoids and 40°C in the case of PSII-enriched membranes).

Keywords

Chloride Heat treatment Oxygen-evolving complex Photosystem II Photosystem II membranes Thylakoid membranes 

Abbreviations

Chl

Chlorophyll

DCPIP

2,6-dichlorophenol indophenol

Hepes

N-2-hydroxyethyl-piperazine-N,2-ethanesulphonic acid

MOPS

N-Morpholino propane sulphonic acid

PPBQ

phenyl-p-benzoquinone

PSII

Photosystem II

YD+

photo-oxidized Tyrosine-160 of D2 polypeptide

OEC

oxygen-evolving complex

Notes

Acknowledgements

Financial supports, the project (INT/ILTP/B-6.27) from Department of Science and Technology (DST) India, to AJ and Senior Research Fellowship (9/301(109)/2K5-EMR-I) by Council of Scientific and Industrial Research (CSIR) India to AT are thankfully acknowledged. We also thank Dr. Tushar Banerjee for helpful discussions and help in EPR measurements. PM acknowledges the Indian National Science Academy, New Delhi and Devi Ahilya University, Indore, for support. We thank Dr. George C. Papageorgiou, Emeritus, Director of research, Athens, Greece and Prof. Govindjee for many valuable suggestions.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Arjun Tiwari
    • 1
  • Anjana Jajoo
    • 1
  • Sudhakar Bharti
    • 1
  • Prasanna Mohanty
    • 1
  1. 1.School of Life SciencesDevi Ahilya UniversityIndoreIndia

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