Journal
BIOCHEMICAL SOCIETY TRANSACTIONS
Volume 33, Issue -, Pages 858-862Publisher
PORTLAND PRESS LTD
DOI: 10.1042/BST0330858
Keywords
carotenoid; chlorophyll; election transfer; excitation energy transfer; feedback de-excitation component; non-photochemical quenching
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NPQ (non-photochemical quenching) is a fundamental photosynthetic mechanism by which plants protect themselves against excess excitation energy and the resulting photodamage. A discussed molecular mechanism of the so-called feedback de-excitation component (qE) of NPQ involves the formation of a quenching complex. Recently, we have studied the influence of formation of a zeaxanthin-chlorophyll complex on the excited states of the pigments using high-level quantum chemical methodology. in the case of complex formation, electron-transfer quenching of chlorophyll-excited states by carotenoids is a relevant quenching mechanism. Furthermore, additionally occurring charge-transfer excited states can be exploited experimentally to prove the existence of the quenching complex during NPQ.
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