Zeaxanthin-dependent nonphotochemical quenching does not occur in photosystem i in the higher plant Arabidopsis thaliana

Lijin Tian, Pengqi Xu, Volha U. Chukhutsina, Alfred R. Holzwarth, Roberta Croce*

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Nonphotochemical quenching (NPQ) is the process that protects the photosynthetic apparatus of plants and algae from photodamage by dissipating as heat the energy absorbed in excess. Studies on NPQ have almost exclusively focused on photosystem II (PSII), as it was believed that NPQ does not occur in photosystem I (PSI). Recently, Ballottari et al. [Ballottari M, et al. (2014) Proc Natl Acad Sci USA 111:E2431-E2438], analyzing PSI particles isolated from an Arabidopsis thaliana mutant that accumulates zeaxanthin constitutively, have reported that this xanthophyll can efficiently induce chlorophyll fluorescence quenching in PSI. In this work, we have checked the biological relevance of this finding by analyzing WT plants under high-light stress conditions. By performing timeresolved fluorescence measurements on PSI isolated from Arabidopsis thaliana WT in dark-adapted and high-light-stressed (NPQ) states, we find that the fluorescence kinetics of both PSI are nearly identical. To validate this result in vivo, we have measured the kinetics of PSI directly on leaves in unquenched and NPQ states; again, no differences were observed. It is concluded that PSI does not undergo NPQ in biologically relevant conditions in Arabidopsis thaliana. The possible role of zeaxanthin in PSI photoprotection is discussed.

Original languageEnglish
Pages (from-to)4828-4832
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume114
Issue number18
Early online date17 Apr 2017
DOIs
Publication statusPublished - 2 May 2017

Funding

This work was supported by De Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Earth and Life Sciences, through a Vici grant and by the European Research Council through European Research Council Consolidator Grant 281341 (to R.C.).

FundersFunder number
De Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Earth and Life Sciences
European Research Council281341

    Keywords

    • LHCI
    • Light stress
    • NPQ
    • Photosystem I
    • Time-resolved fluorescence

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