Exploring the mechanism(s) of energy dissipation in the light harvesting complex of the photosynthetic algae Cyclotella meneghiniana

C. Ramanan, R. Berera, K. Gundermann, I.H.M. van Stokkum, C. Buchel, R. van Grondelle

Research output: Contribution to JournalArticle

Abstract

Photosynthetic organisms have developed vital strategies which allow them to switch from a light-harvesting to an energy dissipative state at the level of the antenna system in order to survive the detrimental effects of excess light illumination. These mechanisms are particularly relevant in diatoms, which grow in highly fluctuating light environments and thus require fast and strong response to changing light conditions. We performed transient absorption spectroscopy on FCPa, the main light-harvesting antenna from the diatom Cyclotella meneghiniana, in the unquenched and quenched state. Our results show that in quenched FCPa two quenching channels are active and are characterized by differing rate constants and distinct spectroscopic signatures. One channel is associated with a faster quenching rate (16 ns
Original languageEnglish
Pages (from-to)1507-1513
JournalBiochimica et Biophysica Acta (BBA) - Bioenergetics
Volume2014
Issue number9
DOIs
Publication statusPublished - 2014

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