Počet záznamů: 1  

Complex Metabolic Oscillations in Plants Forced by Harmonic Irradiance

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    SYSNO ASEP0170648
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JOstatní články
    NázevComplex Metabolic Oscillations in Plants Forced by Harmonic Irradiance
    Tvůrce(i) Nedbal, Ladislav (UEK-B)
    Březina, Vítězslav (UEK-B)
    Zdroj.dok.Biophysical Journal. - : Cell Press - ISSN 0006-3495
    Roč. 83, č. 4 (2002), s. 2180-2189
    Poč.str.10 s.
    Jazyk dok.eng - angličtina
    Země vyd.US - Spojené státy americké
    Klíč. slovaoscillations
    Vědní obor RIVBO - Biofyzika
    CEZAV0Z6087904 - UEK-B
    AnotacePlants exposed to harmonically modulated irradiance, 1 + cos(t), exhibit a complex periodic pattern of chlorophyll fluorescence emission that can be deconvoluted into a steady-state component, a component that is modulated with the frequency of the irradiance (), and into at least two upper harmonic components (2 and 3). A model is proposed that accounts for the upper harmonics in fluorescence emission by nonlinear negative feedback regulation of photosynthesis. In contrast to simpler linear models, the model predicts that the steady-state fluorescence component will depend on the frequency of light modulation, and that amplitudes of all fluorescence components will exhibit resonance peak(s) when the irradiance frequency is tuned to an internal frequency of a regulatory component. The experiments confirmed that the upper harmonic components appear and exhibit distinct resonant peaks. The frequency of autonomous oscillations observed earlier upon an abrupt increase in CO2 concentration corresponds to the sharpest of the resonant peaks of the forced oscillations. We propose that the underlying principles are general for a wide spectrum of negative-feedback regulatory mechanisms. The analysis by forced harmonic oscillations will enable us to examine internal dynamics of regulatory processes that have not been accessible to noninvasive fluorescence monitoring to date.
    PracovištěÚstav výzkumu globální změny
    KontaktNikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268
    Rok sběru2003

Počet záznamů: 1  

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