Damage and protection of the photosynthetic apparatus from UV-B radiation. II. Effect of quercetin at different pH created by Anelia G. Dobrikova and Emilia L. Apostolova

By:

Dobrikova, Anelia G [author]

Contributor(s):

Apostolova, Emilia L [co-author]

Material type: Text

TextSeries: Journal of plant physiology ; Volume 184Amsterdam: Elsevier GmbH, 2015Content type:

text

Media type:

unmediated

Carrier type:

volume

ISSN:

0176-1617

Subject(s):

Low-temperature chlorophyll fluorescence -- Pea thylakoid membranes -- Photosynthetic oxygen evolution

LOC classification:

QK711.2 JOU

Online resources:

Click here to access online

Abstract: The effect of the exogenously added quercetin against the UV-B inhibition of the photosystem II (PSII) functions in isolated pea thylakoid membranes suspended at different pH of the medium (6.5, 7.6 and 8.4) was investigated. The data revealed that the interaction of this flavonoid with the membranes depends on the pH and influences the initial S0-S1 state distribution of PSII in the dark, the energy transfer between pigment-protein complexes of the photosynthetic apparatus and the membrane fluidity. Quercetin also displays a different UV-protective effect depending on its location in the membranes, as the effect is more pronounced at pH 8.4 when it is located at the membrane surface. The results suggest that quercetin induces structural changes in thylakoid membranes, one of the possible reasons for its protection of the photosynthetic apparatus.

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Item type	Current library	Call number	Vol info	Status	Notes	Date due	Barcode
Journal Article	Main Library Journal Article	QK711.2 JOU (Browse shelf(Opens below))	Vol. 184(pages98-105)	Not for loan	For in house use only

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The effect of the exogenously added quercetin against the UV-B inhibition of the photosystem II (PSII) functions in isolated pea thylakoid membranes suspended at different pH of the medium (6.5, 7.6 and 8.4) was investigated. The data revealed that the interaction of this flavonoid with the membranes depends on the pH and influences the initial S0-S1 state distribution of PSII in the dark, the energy transfer between pigment-protein complexes of the photosynthetic apparatus and the membrane fluidity. Quercetin also displays a different UV-protective effect depending on its location in the membranes, as the effect is more pronounced at pH 8.4 when it is located at the membrane surface. The results suggest that quercetin induces structural changes in thylakoid membranes, one of the possible reasons for its protection of the photosynthetic apparatus.

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