Photochemical changes and oxidative damage in the aquatic macrophyte Cymodocea nodosa exposed to paraquat-induced oxidative stress

Pesticide Biochemistry and Physiology
M MoustakasI Sperdouli

Abstract

The non-selective herbicide paraquat (Pq) is being extensively used for broad-spectrum weed control. Through water runoff and due to its high water solubility it contaminates aquatic environments. Thus, the present study was carried out to investigate the photochemical changes and oxidative damage in the aquatic macrophyte Cymodocea nodosa to short- (2h) and long-term (24h) exposure to 2, 20, 200 and 1000μM paraquat (Pq) toxicity by using chlorophyll fluorescence imaging and H2O2 real-time imaging. The effective quantum yield of PSII (ΦPSII) show a tendency to increase at 2μM Pq after 2h exposure, and increased significantly at 20 and 200μM Pq. Τhe maximum oxidative effect on C. nodosa leaves was observed 2h after exposure to 200μM Pq concentration when the highest increases of ΦPSII due to high electron transport rate (ETR) resulted in a significant increase of H2O2 production due to the lowest non-photochemical quenching (NPQ) that was not efficient to serve as a protective mechanism, resulting in photooxidation. Prolonged exposure (24h) to 200μM Pq resulted in a decreased ΦPSII not due to an increase of the photoprotective mechanism NPQ, but due to high quantum yield of non-regulated energy loss in PSII (ΦNO), resulting to t...Continue Reading

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May 28, 2014·Pesticide Biochemistry and Physiology·Julietta Moustaka, Michael Moustakas

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Citations

Aug 27, 2016·Laboratory Investigation; a Journal of Technical Methods and Pathology·Mark D Thompson, Xiao Feng Zhang
Nov 14, 2016·Environmental Science and Pollution Research International·Gülriz BayçuMichael Moustakas
Jan 25, 2018·International Journal of Molecular Sciences·Zhiwei WeiChao Li
Dec 28, 2019·Environmental Science and Pollution Research International·Paraskevi MaleaIoannis-Dimosthenis S Adamakis
May 26, 2017·Environmental Science and Pollution Research International·Michael MoustakasIlektra Sperdouli
Sep 1, 2018·Environmental Science and Pollution Research International·Hewa Pathirannahelage Athri Thathsarani WeerakoonHewa Bandulage Asanthi
Aug 28, 2020·Frontiers in Plant Science·Ioannis-Dimosthenis S AdamakisMichael Moustakas
Dec 31, 2020·International Journal of Molecular Sciences·Ioannis-Dimosthenis S AdamakisMichael Moustakas
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
Jan 10, 2018·ACS Applied Materials & Interfaces·Orestis AntonoglouCatherine Dendrinou-Samara

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