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Xantofylový cyklus u rostlin a zelených řas: jeho role ve fotosyntetickém aparátu
 Masojídek, Jiří ; Kopecký, Jiří ; Koblížek, Michal ; Torzillo, G.
Light-induced conversion of violaxanthin to zeaxanthin, the so-called xanthophyll cycle serves as a major, short-term light acclimation mechanism in higher plants. The role of xanthophylls in thermal dissipation of surplus excitation energy was deduced from the linear relationship between zeaxanthin formation and the magnitude of nonphotochemical quenching. We have studied the role of the xanthophyll cycle in the adaptation of several species of green algae (Chlorella, Scenedesmus, Haematococcus, Chlorococcum, Spongiochloris) to high irradiance. The xanthophyll cycle was found functional in all tested organisms; however its contribution to nonphotochemical quenching is not as significant as in higher plants. We assume that algae rely on other dissipation mechanism(s), which operate along with the xanthophyll cycle-dependent quenching
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