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First published online June 15, 2006; 10.1104/pp.106.083055

Plant Physiology 141:1264-1273 (2006)
© 2006 American Society of Plant Biologists

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BIOENERGETICS AND PHOTOSYNTHESIS

Suppression of Both ELIP1 and ELIP2 in Arabidopsis Does Not Affect Tolerance to Photoinhibition and Photooxidative Stress1

Silvia Rossini, Anna Paola Casazza, Enrico C.M. Engelmann, Michel Havaux, Robert C. Jennings and Carlo Soave*

Dipartimento di Biologia, Università degli Studi di Milano, 20133 Milano, Italy (S.R., A.P.C., E.C.M.E., R.C.J., C.S.); and CEA/Cadarache, Department of Plant Ecophysiology and Microbiology, Laboratoire d'Ecophysiologie Moléculaire des Plantes, Unité Mixte de Recherche 6191 Centre National de la Recherche Scientifique-CEA-Aix Marseille University, 13108 Saint-Paul-lez-Durance, France (M.H.)

ELIPs (early light-induced proteins) are thylakoid proteins transiently induced during greening of etiolated seedlings and during exposure to high light stress conditions. This expression pattern suggests that these proteins may be involved in the protection of the photosynthetic apparatus against photooxidative damage. To test this hypothesis, we have generated Arabidopsis (Arabidopsis thaliana) mutant plants null for both elip genes (Elip1 and Elip2) and have analyzed their sensitivity to light during greening of seedlings and to high light and cold in mature plants. In particular, we have evaluated the extent of damage to photosystem II, the level of lipid peroxidation, the presence of uncoupled chlorophyll molecules, and the nonphotochemical quenching of excitation energy. The absence of ELIPs during greening at moderate light intensities slightly reduced the rate of chlorophyll accumulation but did not modify the extent of photoinhibition. In mature plants, the absence of ELIP1 and ELIP2 did not modify the sensitivity to photoinhibition and photooxidation or the ability to recover from light stress. This raises questions about the photoprotective function of these proteins. Moreover, no compensatory accumulation of other ELIP-like proteins (SEPs, OHPs) was found in the elip1/elip2 double mutant during high light stress. elip1/elip2 mutant plants show only a slight reduction in the chlorophyll content in mature leaves and greening seedlings and a lower zeaxanthin accumulation in high light conditions, suggesting that ELIPs could somehow affect the stability or synthesis of these pigments. On the basis of these results, we make a number of suggestions concerning the biological function of ELIPs.

1 This work was supported in part by MIUR (FIRB project no. RBAU01E3CX) and in part by the Institute of Biophysics, Division Research Milano, CNR, Italy.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Carlo Soave (carlo.soave{at}unimi.it).

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.106.083055.

* Corresponding author; e-mail carlo.soave{at}unimi.it; fax 39–0250314815.

Received May 3, 2006; returned for revision May 31, 2006; accepted May 31, 2006.




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