Leaf Age-Dependent Effects of Foliar-Sprayed CuZn Nanoparticles on Photosynthetic Efficiency and ROS Generation in Arabidopsis thaliana

Materials
Ilektra SperdouliMichael Moustakas

Abstract

Young and mature leaves of Arabidopsis thaliana were exposed by foliar spray to 30 mg L-1 of CuZn nanoparticles (NPs). The NPs were synthesized by a microwave-assisted polyol process and characterized by dynamic light scattering (DLS), X-ray diffraction (XRD), and transmission electron microscopy (TEM). CuZn NPs effects in Arabidopsis leaves were evaluated by chlorophyll fluorescence imaging analysis that revealed spatiotemporal heterogeneity of the quantum efficiency of PSII photochemistry (ΦPSΙΙ) and the redox state of the plastoquinone (PQ) pool (qp), measured 30 min, 90 min, 180 min, and 240 min after spraying. Photosystem II (PSII) function in young leaves was observed to be negatively influenced, especially 30 min after spraying, at which point increased H2O2 generation was correlated to the lower oxidized state of the PQ pool.. Recovery of young leaves photosynthetic efficiency appeared only after 240 min of NPs spray when also the level of ROS accumulation was similar to control leaves. On the contrary, a beneficial effect on PSII function in mature leaves after 30 min of the CuZn NPs spray was observed, with increased ΦPSΙΙ, an increased electron transport rate (ETR), decreased singlet oxygen (1O2) formation, and H2O2 ...Continue Reading

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Citations

Aug 28, 2020·Frontiers in Plant Science·Ioannis-Dimosthenis S AdamakisMichael Moustakas
Jun 5, 2020·Environmental Science and Pollution Research International·Wei WangZhiwen Cui
Jan 28, 2021·Materials·Michael Moustakas
Dec 31, 2020·International Journal of Molecular Sciences·Ioannis-Dimosthenis S AdamakisMichael Moustakas
Apr 4, 2021·Plants·Maria-Lavrentia StamelouMichael Moustakas
May 4, 2021·Frontiers in Plant Science·Michael MoustakasLucia Guidi
Jun 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ilektra SperdouliMichael Moustakas
Jul 25, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ilektra SperdouliMichael Moustakas

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Methods Mentioned

BETA
fluorescence imaging
X-ray
dynamic light scattering
environmental stress

Software Mentioned

StatView
AxioVision
Imaging Win

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