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Plant and Cell Physiology Advance Access originally published online on July 18, 2006
Plant and Cell Physiology 2006 47(8):1146-1157; doi:10.1093/pcp/pcj089
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© The Author 2006. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Digalactosyl-Diacylglycerol Deficiency Impairs the Capacity for Photosynthetic Intersystem Electron Transport and State Transitions in Arabidopsis thaliana Due to Photosystem I Acceptor-Side Limitations

Alexander G. Ivanov1,2, Luke Hendrickson2, Marianna Krol1, Eva Selstam2, Gunnar Öquist2, Vaughan Hurry2 and Norman P. A. Huner1, ,*

1 Department of Biology and The Biotron, University of Western Ontario, London, Ontario, Canada N6A 5B7
2 Umea Plant Science Centre, Department of Plant Physiology, University of Umeå, Umeå S-901 87, Sweden

* Corresponding author: E-mail, nhuner{at}uwo.ca; Fax, +1-519-661-3935.

Compared with wild type, the dgd1 mutant of Arabidopsis thaliana exhibited a lower amount of PSI-related Chl–protein complexes and lower abundance of the PSI-associated polypeptides, PsaA, PsaB, PsaC, PsaL and PsaH, with no changes in the levels of Lhca1–4. Functionally, the dgd1 mutant exhibited a significantly lower light-dependent, steady-state oxidation level of P700 (P700+) in vivo, a higher intersystem electron pool size, restricted linear electron transport and a higher rate of reduction of P700+ in the dark, indicating an increased capacity for PSI cyclic electron transfer compared with the wild type. Concomitantly, the dgd1 mutant exhibited a higher sensitivity to and incomplete recovery of photoinhibition of PSI. Furthermore, dgd1 exhibited a lower capacity to undergo state transitions compared with the wild type, which was associated with a higher reduction state of the plastoquinone (PQ) pool. We conclude that digalactosyl-diacylglycerol (DGDG) deficiency results in PSI acceptor-side limitations that alter the flux of electrons through the photosynthetic electron chain and impair the regulation of distribution of excitation energy between the photosystems. These results are discussed in terms of thylakoid membrane domain reorganization in response to DGDG deficiency in A. thaliana.

(Received March 22, 2006; Accepted July 3, 2006)
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