(P2B-1) Non-photochemical quenching (qe) involves interaction of PsbS with the Photosystem II core antenna. (Abstract 444)
Xiao-Ping Li^*,1, Adam Gilmore², Krishna Niyogi¹, ¹ Department of Plant and Microbial Biology, University of California, Berkeley, 111 Koshland Hall, Berkeley, CA, USA² Jobin-Yvon Inc., 3880 Park Ave, Edison, NJ, USA

(P2B-2) Role and regulation of the bidirectional hydrogenase of Synechocystis 6803. (Abstract 445)
Jens Appel^*,, Sven Künzel¹, Rüdiger Schulz-Friedrich¹, ¹ Botanisches Institut, Christian-Albrechts-Universität, Am Botanischen Garten 1-9, Kiel, Germany

(P2B-3) A dissipative conformation of the antenna protein Lhcb5 reveals a PsbS independent, zeaxanthin dependent, mechanism of photoprotection. (Abstract 446)
Luca Dall'Osto¹, Caffarri Stefano ^{*,1, 2}, Roberto Bassi^{*,1, 2}, ¹ Dipartimento Scientifico e Tecnologico, Universitŕ di Verona., Verona, Italy² Laboratoire de Génétique et Biophysique des Plantes (LBTE), Marseille, France

(P2B-4) State transitions and organisation of PCB antenna in Prochlorothrix Hollandica. (Abstract 447)
Sam Benson^*,1, James Duncan¹, James Barber¹, ¹ The Wolfson Laboratories, London, Greater London, United kingdom

(P2B-5) The role and regulation of multiple forms of ferredoxin NADP oxidoreductase in higher plants. (Abstract 448)
Caroline Bowsher^*,1, Linda Eyers¹, Caroline Grimshaw¹, Jennet Gummodova¹, ¹ School of Biological Sciences, Manchester, UK

(P2B-6) Probing electron fluxes through Photosystem I in cucumber leaf discs by far-red light. (Abstract 449)
Wah Soon Chow^*,1, Alexander Hope², ¹ Research School of Biological Sciences, Canberra, Australian Capital Territory, Australia² School of Biological Sciences, Adelaide, South Australia, Australia

(P2B-7) A zeaxanthin-independent non-photochemical quenching mechanism localised in the Photosystem II core complex. (Abstract 450)
Giovanni Finazzi^*,1, Giles Johnson², Luca Dallosto³, Pierre Joliot¹, Francis-André Wollman¹, Roberto Bassi³, ¹ UPR 1261 CNRS, Institut de Biologie Physico Chimique, Paris, France² University of Manchester, School of Biological Sciences, Manchester, United Kingdom³ L.G.B.P. Faculté des Sciences de Luminy, Marseille, France

(P2B-8) Thermo-optically induced reversible reorganizations in LHCII. Significance of thermal instability, role of LHCII-only domains in thylakoids. (Abstract 451)
Jens Holm^{1, 2}, Sashka Krumova^{1, 3}, Zsuzsanna Várkonyi¹, Svetla Todinova³, Subrimanyan Rajagopal¹, Dorthe Posselt², Stefka Taneva³, Győző Garab^*,, ¹ Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences, Szeged, Hungary² IMFUFA, Dept. of Mathematics and Physics, Roskilde University, Roskilde, Denmark³ Institute of Biophysics, Bulgarian Academy of Sciences, Sofia, Bulgaria

(P2B-9) Carotenoid radical formation and the regulation of photosynthetic light harvesting. (Abstract 452)
Nancy Holt^{*,1, 2}, Donatas Zigmantas^{1, 2}, Xiao-Ping Li³, Krishna Niyogi³, Graham Fleming^{1, 2}, ¹ Department of Chemistry, Berkeley, CA, USA² Physical Biosciences Division, Berkeley, CA, USA³ Department of Plant and Microbial Biology, Berkeley, CA, USA

(P2B-10) Substituted quinones retard the photooxidation of the primary electron donor of Photosystem I. (Abstract 453)
David Joly^*,1, Rajagopal Subramanyam², Elena Egorova³, Nikolai Bukhov³, Robert Carpentier¹, ¹ Groupe de Recherche en Énergie et Information Biomoléculaires, Trois-Rivičres, Québec, Canada² Photosynthesis Center, Tempe, Arizona, USA³ K.A. Tamiriazev Institute of Plant Physiology, Moscow, Russia

(P2B-11) Irreversible changes in photosynthetic rate induced by heating above 40 °C. (Abstract 454)
Radek Kaa^{*,1, 2}, Eva Kotabová¹, Petr Ilík¹, Jan Nau¹, Ondej Práil², ¹ Laboratory of Biophysics, Olomouc, Czech Republic² Institute of Physical Biology, Tebo, Czech Republic

(P2B-12) How plants see blue light: The photochemistry of phototropin. (Abstract 455)
John Kennis^*,1, Sean Crosson², Magdalena Gauden¹, Maxime Alexandre¹, Ivo van Stokkum¹, Klaas Hellingwerf³, Keith Moffat², Rienk van Grondelle¹, ¹ Department of Biophysics, Amsterdam, The Netherlands² Department of Biochemistry and Molecular Biology, Chicago, IL, USA³ Swammerdam Institute for Life Sciences, Amsterdam, The Netherlands

(P2B-13) The function of the PsbS protein in relation to non-photochemical energy dependent quenching in rice plants. (Abstract 456)
Hee-Young Koo^*,1, Ismayil Zulfugarov¹, Min-Hyuk Oh¹, Sun Ho Kim¹, Yong-Hwan Moon¹, Chin Bum Lee², Stefan Jansson³, Gynheung An⁴, ¹ Department of Molecular Biology, Pusan National University, Busan, Republic of Korea^{2 3 4}

(P2B-14) Redox state analysis of plastoquinone-pool in Arabidopsis reveals unexpected changes under different light conditions. (Abstract 457)
Jerzy Kruk^*,1, Stanislaw Karpinski², ¹ Department of Plant Physiology and Biochemistry, Kraków, Poland² Department of Botany, Stockholm, Sweden

(P2B-15) Solving the molecular mechanisms of photoprotection in diatoms. (Abstract 458)
Johann LAVAUD^*,,

(P2B-16) Statistical properties of parameters evaluated from the O-J-I-P chlorophyll a fluorescence transients and their changes upon high temperature stress. (Abstract 459)
Dušan Lazár^*,1, Petr Sušila¹, Jan Nauš¹, ¹ Laboratory of Biophysics, Olomouc, Czech Republic

(P2B-17) Influence of the redox potential of the quinone acceptor on singlet oxygen production in Photosystem II. (Abstract 460)
Anja Liszkay^*,1, Christian Fufezan¹, Beat Fischer³, Arthur William Rutherford², ¹ Institute of Biology II, Freiburg, Germany³ Department of Envrinmental Microbiology and Molecular Ecotoxicology, Duebendorf, Switerland² Institute of Biology II, Germany

(P2B-18) Specificity for the coenzyme in ferredoxin-NADP⁺ reductase: An attempt to create a NAD⁺ dependent FNR. (Abstract 461)
Marta Martinez-Julvez^*,1, Jesus Tejero¹, Jose Peregrina¹, Carlos Gomez-Moreno¹, Milagros Medina¹, ¹ Departamento de Bioquimica. BIFI., Zaragoza, Spain

(P2B-19) Role of Anabaena flavodoxin hydrophobic residues in protein-protein interaction and electron transfer to ferredoxin-NADP⁺ reductase. (Abstract 462)
Susana Frago^*,1, Guillermina Gońi¹, Ana Serrano¹, Stephen Mayhew², Carlos Gomez-Moreno¹, Milagros Medina¹, ¹ Departamento de Bioquímica y Biología Molecular y Celular, Zaragoza, Spain² Departamento de Bioquímica y Biología Molecular y Celular, Zaragoza, Spain

(P2B-20) Photosystem II function of cotton by the OJIP test. (Abstract 463)
Jocelyn Morrison^*,1, Christa Critchley¹, ¹ The University of Queensland, Brisbane, Queensland, Australia

(P2B-21) Promoter preference and light-responsive transcription of plastid factors in Arabidopsis. (Abstract 464)
Yayoi Onda^*,1, Yusuke Yagi¹, Takateru Mochizuki¹, Yuichi Tsunoyama², Yoshinori Toyoshima¹, ¹ Department of Bioscience and Nano-Biotechnology Research Center, Sanda, Hyogo, Japan² Radioisotope Research Center, Kyoto University, Sakyo-ku, Kyoto, Japan

(P2B-22) Photosynthetic redox regulation of Arabidopsis nuclear genes. (Abstract 465)
Mirva Piippo^*,1, Yagut Allahverdiyeva¹, Natalia Battchikova¹, Eva-Mari Aro¹, ¹ Department of Biology, Turku, Finland

(P2B-23) Excited state dynamics of the orange carotenoid protein from cyanobacteria. (Abstract 466)
TomᚠPolívka^*,1, Cheryl Kerfeld², Villy Sundström¹, ¹ Chemical Physics, Lund University, Sweden² Molecular Biology Institute, University of California, USA

(P2B-24) New approaches to studies of cell cycle regulation of photosynthesis in algae. (Abstract 467)
Ivan Setlik^{1, 2}, Eva Setlikova^{1, 2}, Zdenko Gardian², Radek Kana², Josef Komenda^{1, 2}, Vojtech Kasalicky^{1, 2}, Ondrej Prasil^{*,1, 2}, ¹ Institute of Microbiology AVCR, Trebon, Czech Republic² Institute of Physical Biology, Nove Hrady, Czech Republic

(P2B-25) Photosystem I and the fluorescence induction kinetics in vivo: The effects of DBMIB and methylviologen. (Abstract 468)
Gert Schansker^*,1, Szilvia Tóth¹, Reto Strasser¹, ¹ Laboratory of Bioenergetics, Geneva, Switzerland

(P2B-26) Plastocyanin contributes to the photosynthetic flux control in tobacco leaves. (Abstract 469)
Mark Aurel Schöttler^*,1, Helmut Kirchhoff¹, Engelbert Weis¹, ¹ Institute of Botany, University of Münster, Schlossgarten 3, Münster, Germany

(P2B-27) A study of unusual light-induced fluorescence changes in the SPCM mutant of Synechocystis PCC 6803. (Abstract 470)
Matt Scott^*,1, Sergej Vasil'ev¹, Chantal McCollum¹, Cheryl Crozier², George Espie², Doug Bruce¹, ¹ Dept. of Biological Sciences, Brock University., St. Catharines, Ontario, Canada² Dept. of Botany, University of Toronto at Missisauga., Missisauga, Ontario, Canada

(P2B-28) Arabidopsis genes involved in chloroplast NDH activity. (Abstract 471)
Toshiharu Shikanai^{*,1, 2}, Mihoko Hashimoto², Emi Kotera², Masao Tasaka², ¹ Kyushu University, Fukuoka, Fukuoka, Japan² Nara Institute of Science and Technology, Ikoma, Nara, Japan

(P2B-29) Cytochrome b₆ in redox regulation of the photosynthesis and chloroplast gene function. (Abstract 472)
Jörgen Ström^*,1, Jens Forsberg², Sujith Puthiyaveetil¹, John Allen¹, ¹ Plant Biochemistry, Lund University, Sweden² Medical Biochemistry and Microbiology, Uppsala, Sweden

(P2B-30) State-changes realising adaptation to stress as the result of an optimized redistribution of functional microstates. (Abstract 473)
Reto Strasser^*,1, Merope Tsimilli-Michael^{1, 2}, ¹ Bioenergetics Laboratory, Geneva, Switzerland² Ministry of Education and Culture, Nicosia, Cyprus

(P2B-31) Ferredoxin NADP⁺ oxidoreductase (FNR) in different domains of the thylakoid membrane. (Abstract 474)
Marjaana Suorsa^*,1, Virpi Paakkarinen¹, Natalia Battchikova¹, Ammar Saleem¹, Ravi Danielsson², Eva-Mari Aro¹, ¹ Department of Biology, Plant Physiology and Molecular Biology, University of Turku, Turku, Finland² Biochemistry, Chemical Center, Lund University, Lund, Sweden

(P2B-32) Quantitative interplay of Psbs and VDE protonation events in the activation of qE. (Abstract 475)
KENJI TAKIZAWA^*,1, JEFFREY CRUZ¹, DAVID KRAMER¹, ¹ Institute of Biological Chemistry, Washington State University, Pullman, Washington, USA

(P2B-33) Two independent light signals cooperating on the activation of psbD blue light-responsive promoter in Arabidopsis. (Abstract 476)
Takateru Mochizuki¹, Yayoi Onda¹, Masamitsu Wada², Yoshinori Toyoshima^*,1, ¹ Department of Bioscience and Nano-Biotechnology Research Center, Sanda, Hyogo, Japan² Department of Biological Sciences, Graduate School of Science, Hachioji, Tokyo, Japan

(P2B-34) Systematic characterization of in vivo protein phosphorylation in photosynthetic thylakoid membranes by mass spectrometry. (Abstract 477)
Alexander Vener^*,1, Maria Hansson¹, Maria Turkina¹, Arsenio Villarejo², Inger Carlberg³, ¹ Division of Cell Biology, Linköping University, Linköping, Sweden² Department of Plant Physiology, University of Umeĺ, Umeĺ, Sweden³ Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden

(P2B-35) Differing roles for hydrolytic and phosphorolytic starch break down. (Abstract 478)
Sean Weise^*,1, Thomas Sharkey¹, ¹ University of Wisconsin-Madison, Madison, Wisconsin, USA