Non-photochemical fluorescence quenching in Chromera velia is enabled by fast violaxanthin de-epoxidation |
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Authors: | Kotabová Eva Kaňa Radek Jarešová Jana Prášil Ondřej |
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Affiliation: | 1. Institute of Microbiology, Academy of Sciences of the Czech Republic, Opatovický mlýn, 379 81 T?eboň, Czech Republic;2. Institute of Physical Biology, Nové Hrady, University of South Bohemia in ?eské Budějovice, Czech Republic |
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Abstract: | Non-photochemical quenching (NPQ) is a mechanism protecting photosynthetic organisms against excessive irradiation. Here, we analyze a unique NPQ mechanism in the alga Chromera velia, a recently discovered close relative of apicomplexan parasites. NPQ in C. velia is enabled by an operative and fast violaxanthin de-epoxidation to zeaxanthin without accumulation of antheraxanthin. In C. velia violaxanthin also serves as a main light-harvesting pigment. Therefore, in C. velia violaxanthin acts as a key factor in both light harvesting and photoprotection. This is in contrast to a similar alga, Nannochloropsis limnetica, where violaxanthin has only light-harvesting function. |
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