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van Oort B, Roy LM, Xu P, et al. Revisiting the Role of Xanthophylls in Nonphotochemical Quenching. J Phys Chem Lett. 2018;9(2):346-352doi: 10.1021/acs.jpclett.7b03049.
van Oort, B., Roy, L. M., Xu, P., Lu, Y., Karcher, D., Bock, R., & Croce, R. (2018). Revisiting the Role of Xanthophylls in Nonphotochemical Quenching. The journal of physical chemistry letters, 9(2), 346-352. https://doi.org/10.1021/acs.jpclett.7b03049
van Oort, Bart, et al. "Revisiting the Role of Xanthophylls in Nonphotochemical Quenching." The journal of physical chemistry letters vol. 9,2 (2018): 346-352. doi: https://doi.org/10.1021/acs.jpclett.7b03049
van Oort B, Roy LM, Xu P, Lu Y, Karcher D, Bock R, Croce R. Revisiting the Role of Xanthophylls in Nonphotochemical Quenching. J Phys Chem Lett. 2018 Jan 18;9(2):346-352. doi: 10.1021/acs.jpclett.7b03049. Epub 2018 Jan 08. PMID: 29251936.
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J Phys Chem Lett. 2018 Jan 18;9(2):346-352. doi: 10.1021/acs.jpclett.7b03049. Epub 2018 Jan 08.

Revisiting the Role of Xanthophylls in Nonphotochemical Quenching.

The journal of physical chemistry letters

Bart van Oort, Laura M Roy, Pengqi Xu, Yinghong Lu, Daniel Karcher, Ralph Bock, Roberta Croce

Affiliations

  1. Biophysics of Photosynthesis, Department of Physics and Astronomy, Faculty of Sciences, and LaserLaB Amsterdam, Vrije Universiteit Amsterdam , 1081 HV Amsterdam, The Netherlands.
  2. Max-Planck-Institut für Molekulare Pflanzenphysiologie Wissenschaftspark Golm , Am Mühlenberg 1, 14476 Potsdam-Golm, Germany.

PMID: 29251936 DOI: 10.1021/acs.jpclett.7b03049

Abstract

Photoprotective nonphotochemical quenching (NPQ) of absorbed solar energy is vital for survival of photosynthetic organisms, and NPQ modifications significantly improve plant productivity. However, the exact NPQ quenching mechanism is obscured by discrepancies between reported mechanisms, involving xanthophyll-chlorophyll (Xan-Chl) and Chl-Chl interactions. We present evidence of an experimental artifact that may explain the discrepancies: strong laser pulses lead to the formation of a novel electronic species in the major plant light-harvesting complex (LHCII). This species evolves from a high excited state of Chl a and is absent with weak laser pulses. It resembles an excitonically coupled heterodimer of Chl a and lutein (or other Xans at site L1) and acts as a de-excitation channel. Laser powers, and consequently amounts of artifact, vary strongly between NPQ studies, thereby explaining contradicting spectral signatures attributed to NPQ. Our results offer pathways toward unveiling NPQ mechanisms and highlight the necessity of careful attention to laser-induced artifacts.

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