The protective function of the xanthophyll cycle in photosynthesis

FEBS Letters

Sauvaire, Yves²  Havaux, Michel¹  Sarry, Jean-Emmanuel¹  Montillet, Jean-Luc¹ 

[1] Département de Physiologie Végétale et Ecosystèmes, CEA, Sciences du Vivant, Centre d'Etudes de Cadarache, F-13108 Saint-Paul-lez-Durance, France;Laboratoire de Recherche sur les Substances Naturelles Végétales, Université Montpellier II, F-34095 Montpellier, France

关键词: Xanthophyll cycle;    Lipid peroxidation;    Photosynthetic electron transport;    Photoprotection;    øp;    quantum yield of photosynthetic electron transport;    V;    A and Z;    violaxanthin;    antheraxanthin and zeaxanthin;    respectively;    DTT;    dithiothreitol;    PS;    photosystem;    SOD;    superoxide dismutase;    LCH(II);    light harvesting chlorophyll a/b—protein complexes (of PSII);   

DOI  :  10.1016/0014-5793(94)01028-5

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The rapid conversion of the carotenoid violaxanthin to zeaxanthin via antheraxanthin (xanthophyll cycle) in potato leaves exposed at 23°C to a strong white light of 2000 μE·M⁻²·S⁻¹ was associated with a slight inhibition of photosynthetic electron transport (as estimated from chlorophyll fluorescence measurements) and a low lipid peroxidation (as estimated from ethane measurements). When the xanthophyll cycle was blocked by dithiothreitol (3 mM) or low temperature (3°C), photoinhibition of electron transport was exacerbated and pronounced lipid peroxidation occurred concomitantly. Accumulation of zeaxanthin and antheraxanthin in potato leaves by a non-photoinhibitory light treatment at 23°C (900 μE·m⁻²·s⁻¹ for 1 h) considerably reduced the level of lipid peroxidation during subsequent light stress at 3°C. The presented results indicate that one of the functions of the xanthophyll cycle could be the protection of thylakoid membranes against lipid peroxidation, suggesting that zeaxanthin and antheraxanthin synthesized in strong light are present as free pigments in the membrane lipid bilayer.

【 授权许可】

Unknown