Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1942883 | Biochimica et Biophysica Acta (BBA) - Bioenergetics | 2010 | 10 Pages |
Abstract
The induction and relaxation of non-photochemical quenching (NPQ) under steady-state conditions, i.e. during up to 90Â min of illumination at saturating light intensities, was studied in Arabidopsis thaliana. Besides the well-characterized fast qE and the very slow qI component of NPQ, the analysis of the NPQ dynamics identified a zeaxanthin (Zx) dependent component which we term qZ. The formation (rise time 10-15Â min) and relaxation (lifetime 10-15Â min) of qZ correlated with the synthesis and epoxidation of Zx, respectively. Comparative analysis of different NPQ mutants from Arabidopsis showed that qZ was clearly not related to qE, qT or qI and thus represents a separate, Zx-dependent NPQ component.
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Authors
Manuela Nilkens, Eugen Kress, Petar Lambrev, Yuliya Miloslavina, Marc Müller, Alfred R. Holzwarth, Peter Jahns,