The operation of the lutein epoxide cycle correlates with energy dissipation

Functional Plant Biology : FPB
José I García-PlazaolaJosé María Becerril

Abstract

A new xanthophyll cycle involving de-epoxidation of lutein epoxide (Lx) into lutein in the light and epoxidation back in the dark has been recently described in parasitic plants and in trees from the genus Quercus. To explore the role of the Lx cycle in photoprotection, shade leaves of red oak (Q. rubra), with a relatively high Lx pool, were exposed to different light intensities. Both violaxanthin and Lx were de-epoxidised to the same extent, although the initial kinetics differed, with a rate proportional to the light intensity. De-epoxidation of violaxanthin and Lx was inhibited by dithiothreitol, suggesting that the same enzyme, violaxanthin de-epoxidase (VDE), catalyses both reactions. Dark recovery lagged in the case of Lx, and after 5 h in darkness, the Lx cycle was much more de-epoxidised than the violaxanthin cycle. The different rates of epoxidation of the violaxanthin and Lx cycles were used to study the role of the Lx cycle in photoprotection. Statistical approaches (partial correlation and multiple regression) indicate that in these leaves, maximal photochemical efficiency of PSII (Fv/Fm) and non-photochemical quenching are correlated with the level of Lx de-epoxidation. The potential implications of this finding f...Continue Reading

Citations

Oct 2, 2009·Plant Signaling & Behavior·Raquel EstebanJosé Ignacio García-Plazaola
Jan 23, 2008·Plant, Cell & Environment·Shizue MatsubaraKlaus Winter
Dec 22, 2010·Journal of Experimental Botany·C Pinheiro, M M Chaves
Sep 20, 2015·Journal of Experimental Botany·Anna RusaczonekStanisław Karpiński
Dec 1, 2008·Journal of Phycology·Nadine Schubert, Ernesto García-Mendoza
Oct 1, 2004·Functional Plant Biology : FPB·José I García-PlazaolaJosé M Becerril
Feb 1, 2015·Functional Plant Biology : FPB·Fátima MíguezJosé Ignacio García-Plazaola
May 20, 2020·Frontiers in Plant Science·Reimund Goss, Dariusz Latowski
Feb 20, 2020·Physiologia Plantarum·Alba CotadoMarta Pintó-Marijuan
Sep 1, 2006·Functional Plant Biology : FPB·Chang-Lian PengCheng-Xue Zhao
May 22, 2010·Physiologia Plantarum·Raquel EstebanJosé I García-Plazaola
Nov 14, 2012·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Shizue MatsubaraBarry Osmond
Jul 10, 2012·Photosynthesis Research·José Ignacio García-PlazaolaAlbert Porcar-Castell
Sep 1, 2007·Functional Plant Biology : FPB·Jose I García-PlazaolaC Barry Osmond
Sep 21, 2007·Journal of Agricultural and Food Chemistry·Sara A M BergquistMarie E Olsson

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