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

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 li...

Full description

Saved in:
Bibliographic Details
Published in:Photochemical & photobiological sciences 2018, Vol.17 (4), p.55-516
Main Authors: Torres, Rocio, Diz, Virginia E, Lagorio, M. Gabriela
Format: Article
Language:English
Subjects:
Biochemistry
Biomaterials
Chemical evolution
Chemistry
Chlorophyll
Chloroplasts
Deactivation
Dichlorophenolindophenol
Electron transfer
Electron transport
Emissions
Fluorescence
Gold
Kinetics
Leaves
Mathematical analysis
Nanoparticles
Parameter modification
Photosynthesis
Photosystem II
Physical Chemistry
Plant Sciences
Reduction
Transport processes
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. Interaction between light and plants containing gold nanoparticles: a deep insight into the physicochemical processes taking place.
ISSN:1474-905X
1474-9092
DOI:10.1039/c8pp00067k