NDLI: Rapid chlorophyll a fluorescence transient of Lemna gibba leaf as an indication of light and hydroxylamine effect on photosystem II activity

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Photochemical & Photobiological Sciences Vol - 6 Issue - 4

Photochemical & Photobiological Sciences Vol - 6 Issue - 3

Photochemical & Photobiological Sciences Vol - 6 Issue - 2

Photochemical & Photobiological Sciences Vol -5

Photochemical & Photobiological Sciences Vol -4

Photochemical & Photobiological Sciences Vol -3

Photochemical & Photobiological Sciences Vol -2

Rapid chlorophyll a fluorescence transient of Lemna gibba leaf as an indication of light and hydroxylamine effect on photosystem II activity

Content Provider	Royal Society of Chemistry (RSC)
Author	Perreault, François Dewez, David Popovic, Radovan Ali, Nadia Ait
Copyright Year	2007
Abstract	Rapid chlorophyll fluorescence transient induced by saturating flash (3000 µmol of photons m−2 s−1) was investigated when Lemna gibba had been exposed to light (100 µmol of photons m−2 s−1) causing the Kautsky effect or in low light intensity unable to trigger PSII photochemistry. Measurements were made by using, simultaneously, a pulse amplitude modulated fluorometer and plant efficiency analyzer system, either on non-treated L. gibba leaf or those treated with different concentrations of hydroxylamine (1–50 mM) causing gradual inhibition of the water splitting system. When any leaf was exposed to continuous light during the Kautsky effect, a rapid fluorescence transient may reflect current activity of photosystem II within the photosystem II complex. Under those conditions, a variation of transition steps appearing over time was related to a drastic change to the photosystem II functional properties. This value indicated that the energy dissipation through non-photochemical pathways was undergoing extreme change. The change of rapid fluorescence transient, induced under continuous light, when compared to those obtained under very low light intensity, confirmed the ability of photosystem II to be capable to undergo rapid adaptation lasting about two minutes. When the water splitting system was inhibited and electron donation partially substituted by hydroxylamine, the adaptation ability of photosystem II to different light conditions was lost. In this study, the change of rapid fluorescence kinetic and transient appearing over time was shown to be a good indication for the change of the functional properties of photosystem II induced either by light or by hydroxylamine.
Starting Page	532
Ending Page	538
Page Count	7
File Format	HTM / HTML PDF
ISSN	1474905X
Volume Number	6
Issue Number	5
Journal	Photochemical & Photobiological Sciences
DOI	10.1039/b613605b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Fluorescence spectroscopy Hydroxylamine Water splitting Pulse-amplitude modulation Fluorescence Lemna Photosystem II Photochemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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