Identification of a slowly inducible zeaxanthin-dependent component of non-photochemical quenching of chlorophyll fluorescence generated under steady-state conditions in Arabidopsis |
| |
| Authors: | Manuela Nilkens,Petar Lambrev,Marc Mü ller,Peter Jahns |
| |
| Affiliation: | a Biochemie der Pflanzen, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany
b Max-Planck-Institut für Bioanorganische Chemie, D-45470 Mülheim a.d. Ruhr, Germany |
| |
| Abstract: | The induction and relaxation of non-photochemical quenching (NPQ) under steady-state conditions, i.e. during up to 90 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 10-15 min) and relaxation (lifetime 10-15 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. |
| |
| Keywords: | Ax, antheraxanthin Chl, chlorophyll NPQ, non-photochemical quenching PS II, photosystem II qE, energy-dependent quenching qI, photoinhibitory quecnhing qT, state transition quenching qZ, zeaxanthin-dependent quenching Vx, violaxanthin Zx, zeaxanthin |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
