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Issue 4, 2018
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Effects of gold nanoparticles on the photophysical and photosynthetic parameters of leaves and chloroplasts

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Abstract

Effects of gold nanoparticles (average diameter: 10–14 nm) on leaves and chloroplasts have been studied. Gold nanoparticles (AuNPs) quenched significantly chlorophyll fluorescence when introduced both in intact leaves and isolated chloroplasts. Additionally, the fluorescence spectra corrected for light re-absorption processes showed a net decrease in the fluorescence ratio calculated as the quotient between the maximum fluorescence at 680 and 735 nm. This fact gave evidence for a reduction in the fluorescence emission of the PSII relative to that of the PSI. Strikingly, the photosynthetic parameters derived from the analysis of the slow phase of Kautsky's kinetics, the rate of oxygen evolution and the rate of photo-reduction of 2,6-dichlorophenolindophenol were increased in the presence of AuNPs indicating an apparent greater photosynthetic capacity. The observed results were consistent with an electron transfer process from the excited PSII, which was thermodynamically possible, and which competed with both the electron transport process that initiated photosynthesis and the deactivation of the excited PSII by fluorescence emission. Additionally, it is here explained, in terms of a completely rational kinetic scheme and their corresponding algebraic expressions, why the photosynthetic parameters and the variable and non-variable fluorescence of chlorophyll are modified in a photosynthetic tissue containing gold nanoparticles.

Graphical abstract: Effects of gold nanoparticles on the photophysical and photosynthetic parameters of leaves and chloroplasts

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Publication details

The article was received on 15 Feb 2018, accepted on 14 Mar 2018 and first published on 15 Mar 2018


Article type: Paper
DOI: 10.1039/C8PP00067K
Citation: Photochem. Photobiol. Sci., 2018,17, 505-516
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    Effects of gold nanoparticles on the photophysical and photosynthetic parameters of leaves and chloroplasts

    R. Torres, V. E. Diz and M. G. Lagorio, Photochem. Photobiol. Sci., 2018, 17, 505
    DOI: 10.1039/C8PP00067K

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