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First published online February 23, 2007; 10.1104/pp.107.095562

Plant Physiology 143:1861-1870 (2007)
© 2007 American Society of Plant Biologists

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BIOENERGETICS AND PHOTOSYNTHESIS

The Transiently Generated Nonphotochemical Quenching of Excitation Energy in Arabidopsis Leaves Is Modulated by Zeaxanthin1

Ljudmila Kalituho, Karl Christian Beran and Peter Jahns*

Heinrich Heine-Universität Düsseldorf, Biochemie der Pflanzen, D–40225 Duesseldorf, Germany

Upon the transition of dark-adapted plants to low light, the energy-dependent quenching (qE) of excitation energy is only transiently induced due to the only transient generation of the transthylakoid pH gradient. We investigated the transient qE (qETR) in different Arabidopsis (Arabidopsis thaliana) mutants. In dark-adapted plants, qETR was absent in the npq4 mutant (deficient in the PsbS protein) and the pgr1 mutant (restricted in lumen acidification). In comparison with wild-type plants, qETR was reduced in the zeaxanthin (Zx)-deficient npq1 mutant and increased in the Zx-accumulating npq2 mutant. After preillumination of plants (to allow the synthesis of large amounts of Zx), the formation and relaxation of qETR was accelerated in all plants (except for npq4) in comparison with the respective dark-adapted plants. The extent of qETR, however, was unchanged in npq1 and npq4, decreased in npq2, but increased in wild-type and pgr1 plants. Even in presence of high levels of Zx, qETR in pgr1 mutants was still lower than that in wild-type plants. In the presence of the uncoupler nigericin, qETR was completely abolished in all genotypes. Thus, the transient qETR shows essentially the same characteristics as the steady-state qE; it is strictly dependent on the PsbS protein and a low lumen pH, but the extent of qETR is largely modulated by Zx. These results indicate that qETR does not represent a different quenching mechanism in comparison with the steady-state qE, but simply reflects the response of qE to the dynamics of the lumen pH during light activation of photosynthesis.

1 This work was supported by the Deutsche Forschungsgemeinschaft (grant nos. Ja 665/2–4 and SFB 663, TPB2).

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: Peter Jahns (pjahns{at}uni-duesseldorf.de).

www.plantphysiol.org/cgi/doi/10.1104/pp.107.095562

* Corresponding author; e-mail pjahns{at}uni-duesseldorf.de; fax 49–211–8113706.

Received January 5, 2007; accepted February 17, 2007; published February 23, 2007.

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