Role of the reversible xanthophyll cycle in the photosystem II damage and repair cycle in Dunaliella salina(1)

From: Plant Physiology | Date: May 1, 2003| Author: | Copyright information

The Dunaliella salina photosynthetic apparatus organization and function was investigated in wild type (WT) and a mutant (zeal) lacking all [beta],[beta]-epoxycarotenoids derived from zeaxanthin (Z). The zeal mutant lacked antheraxanthin, violaxanthin, and neoxanthin from its thylakoid membranes but constitutively accumulated Z instead. It also lacked the so-called xanthophyll cycle, which, upon irradiance stress, reversibly converts violaxanthin to Z via a de-epoxidation reaction. Despite the pronounced difference observed in the composition of [beta],[beta]-epoxycarotenoids between WT and ...

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