Ebenhöh, Oliver

Houwaart, Torsten

Lokstein, Heiko

Schlede, Stephanie

Tirok, Katrin

Biosystems

English

The Open University

[kinetic model of primary processes of photosynthesis in chloroplasts. fast phase of chlorophyll ﬂuorescence induction under light of various intensity].

Adenine nucleotide levels, the redox state of the NADP system, and assimilatory force in nonaqueously puriﬁed mesophyll chloroplasts from maize leaves under diﬀerent light intensities.

An examination of factors contributing to non-photochemical quenching of chlorophyll ﬂuorescence in barley leaves.

Chlorophyll a ﬂuorescence as a monitor of nanosecond reduction of the photooxidized primary donor P-680 of photosystem II.

Chlorophyll a ﬂuorescence induction kinetics in leaves predicted from a model describing each discrete step of excitation energy and electron transfer associated with Photosystem II.

Epoxidation of zeaxanthin and antheraxanthin reverses non-photochemical quenching of photosystem II chlorophyll a ﬂuorescence in the presence of trans-thylakoid delta pH.

Kinetic analysis of nonphotochemical quenching of chlorophyll ﬂuorescence. 1. Isolated chloroplasts.

Kinetic modelling of the proton translocating CF0CF1-ATP synthase from spinach.

Kinetic models of photosystem II should accommodate the eﬀect of donor side quenching on variable chlorophyll A ﬂuorescence in the microseconds time range.

Kinetic studies on the xanthophyll cycle in barley leaves (inﬂuence of antenna size and relations to nonphotochemical chlorophyll ﬂuorescence quenching).

Light ﬂuctuations and photosynthesis.

Molecular architecture of the thylakoid membrane: lipid diﬀusion space for plastoquinone.

Photophysics of the carotenoids associated with the xanthophyll cycle in photosynthesis.

Photosynthetic acclimation: does the dynamic structure and macroorganisation of photosystem II in higher plant grana membranes regulate light harvesting states?

Quantum yields and rate constants of photochemical and nonphotochemical excitation quenching (experiment and model).

Redox transfer across the inner chloroplast envelope membrane.

Structural biology. Proton-powered turbine of a plant motor.

The pH dependence of violaxanthin deepoxidation in isolated pea chloroplasts.

The reduction kinetics of chlorophyll aI as an indicator for proton uptake between the light reactions in chloroplasts.

The role of light-harvesting complex II in excess excitation energy dissipation: an in-vivo ﬂuorescence study on the origin of high-energy quenching.

The role of plastocyanin in the adjustment of the photosynthetic electron transport to the carbon metabolism in tobacco.

The value of G degrees for the hydrolysis of ATP.

Xanthophyll biosynthetic mutants of Arabidopsis thaliana: altered nonphotochemical quenching of chlorophyll ﬂuorescence is due to changes in Photosystem II antenna size and stability.

A minimal mathematical model of nonphotochemical quenching of chlorophyll fluorescence

Under natural conditions, plants are exposed to rapidly changing light intensities. To acclimate to such fluctuations, plants have evolved adaptive mechanisms that optimally exploit available light energy and simultaneously minimise damage of the photosynthetic apparatus through excess light. An important mechanism is the dissipation of excess excitation energy as heat which can be measured as nonphotochemical quenching of chlorophyll fluorescence (NPQ). In this paper, we present a highly simplified mathematical model that captures essential experimentally observed features of the short term adaptive quenching dynamics. We investigate the stationary and dynamic behaviour of the model and systematically analyse the dependence of characteristic system properties on key parameters such as rate constants and pool sizes. Comparing simulations with experimental data allows to derive conclusions about the validity of the simplifying assumptions and we further propose hypotheses regarding the role of the xanthophyll cycle in NPQ. We envisage that the presented theoretical description of the light reactions in conjunction with short term adaptive processes serves as a basis for the development of more detailed mechanistic models by which the molecular mechanisms of NPQ can be theoretically studied

A minimal mathematical model of nonphotochemical quenching of chlorophyll fluorescence

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