Zinc Uptake, Photosynthetic Efficiency and Oxidative Stress in the Seagrass Exposed to ZnO Nanoparticles

Overview

Journal Materials (Basel)

Publisher MDPI

Date 2019 Jul 3

PMID 31261885

Citations 13

Authors

Paraskevi Malea

Katerina Charitonidou

Ilektra Sperdouli

Zoi Mylona

Michael Moustakas

Affiliations

Soon will be listed here.

Abstract

We characterized zinc oxide nanoparticles (ZnO NPs) by dynamic light scattering (DLS) measurements, and transmission electron microscopy (TEM), while we evaluated photosystem II (PSII) responses, Zn uptake kinetics, and hydrogen peroxide (HO) accumulation, in exposed to 5 mg L and 10 mg L ZnO NPs for 4 h, 12 h, 24 h, 48 h and 72 h. Four h after exposure to 10 mg L ZnO NPs, we noticed a disturbance of PSII functioning that became more severe after 12 h. However, after a 24 h exposure to 10 mg L ZnO NPs, we observed a hormetic response, with both time and dose as the basal stress levels needed for induction of the adaptive response. This was achieved through the reduced plastoquinone (PQ) pool, at a 12 h exposure, which mediated the generation of chloroplastic HO; acting as a fast acclimation signaling molecule. Nevertheless, longer treatment (48 h and 72 h) resulted in decreasing the photoprotective mechanism to dissipate excess energy as heat (NPQ) and increasing the quantum yield of non-regulated energy loss (Φ). This increased the formation of singlet oxygen (O), and decreased the fraction of open reaction centers, mostly after a 72-h exposure at 10 mg L ZnO NPs due to increased Zn uptake compared to 5 mg L.

Citing Articles

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Modification of Tomato Photosystem II Photochemistry with Engineered Zinc Oxide Nanorods.

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Hormesis Responses of Photosystem II in under Water Deficit Stress.

Sperdouli I, Ouzounidou G, Moustakas M Int J Mol Sci. 2023; 24(11).

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A Hormetic Spatiotemporal Photosystem II Response Mechanism of Salvia to Excess Zinc Exposure.

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