| Observation of plastoquinone kinetics in photosystem II from delayed fluorescence measurements. | |
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MedLine Citation:
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PMID: 20001095 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Attempts to account for the variations in photosystem II (PSII) under general conditions result in non-linear and cumbersome models that are difficult to validate and render few insights about the system kinetics. In this research, the authors experimentally show that under certain conditions, linear-system techniques could be applied to advantage for probing some basic kinetic characteristics of the plastoquinones (PQs). The PQ redox states of the reaction centres were represented in a conditionally linear model structure with delayed fluorescence (DF) as a measurable output. DF data were acquired for different plant samples and conditions. After least-squares parameter optimisation, not only could the model closely describe the measured DF, but more significantly, the estimated parameters correctly reflected the expected changes induced by drought or [3-(3,4-dichlorophenyl)-1,1-dimethylurea] (DCMU) stress. Analysis showed that for short-pulse illumination, the PQ kinetic states of the reaction centres in an initially dark-adapted plant leaf can be represented as a time-invariant bilinear system in a five-dimensional state space. The system becomes linear for constant illuminations, but the system matrix and the kinetic behaviour are illumination dependent. In particular, the system behaves differently between lights-on and lights-off conditions. The simplicity of the model structure, nonetheless, permits observation and analysis of the PQ kinetics of PSII reaction centres from DF measurements by using linear-system techniques. |
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Authors:
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Y Guo; B Wirth; J Tan |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: IET systems biology Volume: 4 ISSN: 1751-8849 ISO Abbreviation: IET Syst Biol Publication Date: 2010 Jan |
Date Detail:
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Created Date: 2009-12-16 Completed Date: 2010-04-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101301198 Medline TA: IET Syst Biol Country: England |
Other Details:
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Languages: eng Pagination: 90-8 Citation Subset: IM |
Affiliation:
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University of Missouri, Department of Biological Engineering, Columbia, MO 65211, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Computer Simulation Light Metabolic Clearance Rate Models, Biological* Photosystem II Protein Complex / physiology*, radiation effects Plant Leaves / physiology*, radiation effects Plastoquinone / metabolism* Radiation Dosage Spectrometry, Fluorescence / methods |
| Chemical | |
Reg. No./Substance:
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0/Photosystem II Protein Complex; 4299-57-4/Plastoquinone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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