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. 1992 May;99(1):21–25. doi: 10.1104/pp.99.1.21

Effect of Cold Treatments on the Binding Stability of Photosystem II Extrinsic Proteins and an Associated Increase in Susceptibility to Photoinhibition 1

Wei-Qiu Wang 1, David J Chapman 1, James Barber 1
PMCID: PMC1080400  PMID: 16668851

Abstract

When pea plants (Pisum sativum L. cv Feltham First) are subjected to freezing conditions (−18°C) followed by a thaw to 18°C, there is a significant inhibition of water-splitting capacity judged by the rate of light-induced reduction of 2,6-dichlorophenol indophenol using isolated thylakoid membrane fragments enriched in photosystem II (PSII). The freeze-thaw-induced inhibition of water-splitting activity has been correlated with the loss of the 17- and 23-kilodalton extrinsic protein of PSII and with a weakening of the binding of the 33-kilodalton protein. There was no apparent loss of bound manganese. Addition of 10 millimolar CaCl2, however, allowed a full recovery of the water-splitting activity of these modified PSII-enriched particles. The freeze-thaw-induced changes in the organization and functional capacity of PSII was found to increase its susceptibility to photoinhibition in agreement with the concepts presented in the accompanying paper, that oxidative damage can occur within the PSII reaction center as a consequence of extending the lifetime of P680+.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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