INFLUENCE OF ZINC OXIDE NANOPARTICLES ON THE PHYSIOLOGY OF PISTIA STRATIOTES SUBJECTED TO ATRAZINE: IMPLICATIONS FOR PHYTOREMEDIATION

Alex da Silva Cotrim; NATYELLE SANTOS SOARES; Priscila Ferreira Batista; Jeviny Lopes Mendes; Fernanda Farnese; Althiéris de Souza Saraiva; Paulo Eduardo de Menezes Silva

Paper Title

Authors

Alex da Silva Cotrim
NATYELLE SANTOS SOARES
Priscila Ferreira Batista
Jeviny Lopes Mendes
Fernanda Farnese
Althiéris de Souza Saraiva
Paulo Eduardo de Menezes Silva

Modality

Abstract

Subject area

Plant Physiology

Publishing Date

26/09/2022

Country of Publishing

Brasil

Language of Publishing

Inglês

Paper Page

https://www.even3.com.br/anais/cbfv2022_registration/516411-influence-of-zinc-oxide-nanoparticles-on-the-physiology-of-pistia-stratiotes-subjected-to-atrazine--implications-

ISBN

978-65-5941-830-5

Keywords

Keywords: Ecotoxicology, Herbicide, Photosynthesis, Phytoextraction.

Summary

The exacerbated use of atrazine causes negative impacts on the environment and contamination of drinking water, making it necessary to seek methodologies to remove this contaminant from water. One possibility is phytoremediation, but plants are very sensitive to atrazine. The study evaluated the influence of zinc oxide nanoparticles (NP ZnO) on the physiology of Pistia stratiotes exposed to atrazine (Atz). P. stratiotes specimens were cultivated and submitted to the following treatments: T1 – control (nutrient solution); T2 - Atz (0.025 mg L-1); T3 – NP ZnO (plants sprayed with zinc oxide-releasing nanoparticles, at a concentration of 10 mg L-1); T4 – Atz + NP ZnO (plants subjected to Atz and sprayed with NP ZnO). After 15 days, chlorophyll a fluorescence parameters and gas exchange were analyzed using an infrared gas analyzer (LI-6400, Li-Cor). There were decreases in the quantum yield of photosystem II (FPSII) and photochemical quenching (qP). These results were expected, since Atz acts directly on photosystem II, causing the blocking of electron transport. Changes in the photochemical step were reflected in carbon fixation, and plants exposed only to the herbicide showed drops in CO2 fixation. Atz also decreased the ratio between carbon fixation and internal CO2 concentration (A/Ci), a parameter that reflects the carboxylation efficiency of RuBisCO, indicating that the herbicide also compromised the activity of this enzyme. Stomatal conductance remained stable in all treatments. In plants exposed to Atz together with NP ZnO, however, all photosynthetic parameters remained close to the control. It can be concluded that NP ZnO was able to mitigate the damage caused by the herbicide, probably by activating defense pathways, such as the increase in antioxidants. These results may have a positive impact on phytoremediation strategies, but studies evaluating the influence of nanoparticles on atrazine uptake are still needed. Acknowledgments: Capes, FAPEG and IF Goiano.

Title of the Event: XVIII Brazilian Congress of Plant Physiology and I Ibero-latinoamerican Congress of Plant Biology
City of the Event: Porto Alegre
Title of the Proceedings of the event: Annals of the Brazilian Congress of Plant Physiology and Ibero-latinamerican Congress of Plant Biology
Name of the Publisher: Even3
Means of Dissemination: Meio Digital

How to cite

COTRIM, Alex da Silva et al.. INFLUENCE OF ZINC OXIDE NANOPARTICLES ON THE PHYSIOLOGY OF PISTIA STRATIOTES SUBJECTED TO ATRAZINE: IMPLICATIONS FOR PHYTOREMEDIATION.. In: Annals of the Brazilian Congress of Plant Physiology and Ibero-latinamerican Congress of Plant Biology. Anais...Porto Alegre(RS) CEPUCRS, 2022. Available in: https//www.even3.com.br/anais/cbfv2022_registration/516411-INFLUENCE-OF-ZINC-OXIDE-NANOPARTICLES-ON-THE-PHYSIOLOGY-OF-PISTIA-STRATIOTES-SUBJECTED-TO-ATRAZINE--IMPLICATIONS-. Access in: 16/05/2025