Identification of a slowly inducible zeaxanthin-dependent component of non-photochemical quenching of chlorophyll fluorescence generated under steady-state conditions in Arabidopsis

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• 作者：Manuela Nilkens ; Eugen Kress ; Petar Lambrev ; Yuliya Miloslavina ; Marc Mü ; ller ; Alfred R. Holzwarth ; Peter Jahns
• 关键词：Energy dissipation ; Non-photochemical quenching ; Photosynthesis ; Xanthophyll cycle ; Zeaxanthin
• 刊名：Biochimica et Biophysica Acta (BBA)/Bioenergetics
• 出版年：2010
• 出版时间：April 2010
• 年：2010
• 卷：1797
• 期：4
• 页码：466-475
• 全文大小：1326 K

文摘

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.