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J. Biol. Chem., Vol. 282, Issue 12, 8947-8958, March 23, 2007

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Contrasting Behavior of Higher Plant Photosystem I and II Antenna Systems during Acclimation^*

Matteo Ballottari, Luca Dall'Osto, Tomas Morosinotto^¶, and Roberto Bassi¹

From the Dipartimento Scientifico e Tecnologico, Università di Verona, Strada Le Grazie, 15 37134 Verona, Italy, Laboratoire de Génétique et Biophysique des Plantes, Université Aix-Marseille II, 163 Avenue de Luminy, 13009 Marseille, France, and ^¶Dipartimento di Biologia, Università di Padova, 35131 Padova, Italy

In this work we analyzed the photosynthetic apparatus in Arabidopsis thaliana plants acclimated to different light intensity and temperature conditions. Plants showed the ability to acclimate into different environments and avoid photoinhibition. When grown in high light, plants had a faster activation rate for energy dissipation (qE). This ability was correlated to higher accumulation levels of a specific photosystem II subunit, PsbS. The photosystem II antenna size was also regulated according to light exposure; smaller antenna size was observed in high light-acclimated plants with respect to low light plants. Different antenna polypeptides did not behave similarly, and Lhcb1, Lchb2, and Lhcb6 (CP24) are shown to undergo major levels of regulation, whereas Lhcb4 and Lhcb5 (CP29 and CP26) maintained their stoichiometry with respect to the reaction center in all growth conditions. The effect of acclimation on photosystem I antenna was different; in fact, the stoichiometry of any Lhca antenna proteins with respect to photosystem I core complex was not affected by growth conditions. Despite this stability in antenna stoichiometry, photosystem I light harvesting function was shown to be regulated through different mechanisms like the control of photosystem I to photosystem II ratio and the association or dissociation of Lhcb polypeptides to photosystem I.

Received for publication, July 6, 2006 , and in revised form, January 16, 2007.

^* This work was supported by Ministero dell'Istruzione Università e Ricerca Progetti Fondo per gli Investimenti della Ricerca di Base RBAU01E3CX and GENEFUN (functional genetics) program. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

The on-line version of this article (available at http://www.jbc.org) contains supplemental Figs. 1–3.

¹ To whom correspondence should be addressed. Tel.: 390458027916; Fax: 390458027929; E-mail: bassi{at}sci.univr.it.

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