Cadmium inhibits epoxidation of diatoxanthin to diadinoxanthin in the xanthophyll cycle of the marine diatom Phaeodactylum tricornutum

FEBS Letters

Siffel, Pavel¹  Rohacek, Karel¹  Molnar, Istvan¹  Schoefs, Benoît³  Bertrand, Martine² 

[1] Laboratory of Photosynthesis, Institute of Plant Molecular Biology, Academy of Sciences of the Czech Republic, Branisovska 31, CZ-370 05 Ceske Budejovice, Czech Republic;Institut National des Sciences et Techniques de la Mer, Conservatoire National des Arts et Métiers, BP 324, F-50103 Cherbourg Cedex, France;Laboratory of Biomembranes, University of South Bohemia, Branisovska 31, CZ-370 05 Ceske Budejovice, Czech Republic

关键词: Algae;    Microalgae;    Cd;    Heavy metal stress;    Photoprotection mechanism;    Pollution;    AL;    actinic light;    Chl;    chlorophyll;    DD;    diadinoxanthin;    DT;    diatoxanthin;    DTT;    dithiothreitol;    F 0;    minimum chlorophyll fluorescence level;    F 0′;    minimum chlorophyll fluorescence level of the light-adapted state;    F M;    maximum chlorophyll fluorescence level;    F M′;    maximum chlorophyll fluorescence level of the light-adapted state;    F v;    variable fluorescence;    FR;    far-red;    ML;    modulated measuring light;    NPQ;    non-photochemical quenching;    PSII;    photosystem II;    SP;    saturation pulse;   

DOI  :  10.1016/S0014-5793(01)03050-2

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Cd has pleiotropic effects on plant physiology and in particular on photosynthesis. It has not been established yet if Cd alters the functioning of the xanthophyll cycle. To answer this question, an exponentially growing culture of the marine diatom Phaeodactylum tricornutum was incubated with Cd (20 mg/l) for 24 h and irradiated with a light activating the xanthophyll cycle, which in diatoms, consists of the reversible deepoxidation of diadinoxanthin to diatoxanthin. The measurements show that the deepoxidation step is not influenced by Cd. In contrast, the Cd concentration used sharply inhibits the epoxidation of diatoxanthin to diadinoxanthin.

【 授权许可】

Unknown