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Published on July 10, 2003; 10.1104/pp.103.022939

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Received March 4, 2003
Returned for revision March 9, 2003
Accepted April 29, 2003

Changes in the Redox Potential of Primary and Secondary Electron-Accepting Quinones in Photosystem II Confer Increased Resistance to Photoinhibition in Low-Temperature-Acclimated Arabidopsis

Prafullachandra Vishnu Sane , Alexander G. Ivanov , Vaughan Hurry , Norman P.A. Huner , and Gunnar Öquist *

Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå S-901 87, Sweden (P.V.S., V.H., G.O.); and Biology Department, University of Western Ontario, London, Ontario, Canada N6A 5B7 (A.G.I., N.P.A.H.)

* Corresponding author; email: gunnar.oquist{at}plantphys.umu.se.

Exposure of control (non-hardened) Arabidopsis leaves for 2 h at high irradiance at 5°C resulted in a 55% decrease in photosystem II (PSII) photochemical efficiency as indicated by Fv/Fm. In contrast, cold-acclimated leaves exposed to the same conditions showed only a 22% decrease in Fv/Fm. Thermoluminescence was used to assess the possible role(s) of PSII recombination events in this differential resistance to photoinhibition. Thermoluminescence measurements of PSII revealed that S2QA- recombination was shifted to higher temperatures, whereas the characteristic temperature of the S2QB- recombination was shifted to lower temperatures in cold-acclimated plants. These shifts in recombination temperatures indicate higher activation energy for the S2QA- redox pair and lower activation energy for the S2QB- redox pair. This results in an increase in the free-energy gap between P680+QA- and P680+Pheo- and a narrowing of the free energy gap between primary and secondary electron-accepting quinones in PSII electron acceptors. We propose that these effects result in an increased population of reduced primary electron-accepting quinone in PSII, facilitating non-radiative P680+QA- radical pair recombination. Enhanced reaction center quenching was confirmed using in vivo chlorophyll fluorescence-quenching analysis. The enhanced dissipation of excess light energy within the reaction center of PSII, in part, accounts for the observed increase in resistance to high-light stress in cold-acclimated Arabidopsis plants.




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