Responses of individual and combined polystyrene and polymethyl methacrylate nanoplastics on hormonal content, fluorescence/photochemistry of chlorophylls and ROS scavenging capacity in Lemna minor under arsenic-induced oxidative stress

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Nanoplastics alter the adverse impacts of hazardous contaminants such as heavy metals by changing their adsorption and accumulation. Few findings are available on the interaction between nanoplastic and heavy metals in plants. However, there is no report on the mechanisms for removing metal stress-mediated oxidative damage by the combination treatments of nanoplastics. To address this lack of information, polystyrene nanoplastic (PS, 100 mg L-1) and polymethyl methacrylate (PMMA, 100 mg L-1) were hydroponically applied to Lemna minor exposed to arsenate (As, 100 μM) for 7 days. PS or PMMA caused a reduction in the contents of N, P, K, Ca, Mg and Mn, but the improved contents were detected in the presence of PS or PMMA plus As stress. The hormone contents (auxin, gibberellic acid, cytokinin, salicylic acid and jasmonic acid) reduced by stress were re-arranged through PS or PMMA applications. Based on chlorophyll efficiency, fluorescence kinetics and performance of PSII, the impaired photosynthesis by As stress was improved via PS or PMMA applications. This alleviation did not continue under the combined form of PS and PMMA in As-applied plants. All analyzed antioxidant activity (superoxide dismutase (SOD), catalase (CAT), peroxidase (POX), ascorbate peroxidase (APX), glutathione reductase (GR), glutathione S-transferase (GST), glutathione peroxidase (GPX), monodehydroascorbate reductase (MDHAR) and dehydroascorbate reductase (DHAR)) decreased or unchanged under As, PS or PMMA. Due to the inactivation of the defense system, L. minor had high levels of hydrogen peroxide (H2O2) and thiobarbituric acid reactive substances (TBARS), showing lipid peroxidation. After As toxicity, induvial applications of PS or PMMA indicated the activated enzyme capacity (SOD, POX, GST and GPX) and upregulated AsA/DHA, GSH/GSSG and redox state of GSH, which facilitated the removal of radical accumulation. The efficiency of the antioxidant system in As + PS + PMMA-applied L. minor was not enough to remove damage induced by As stress; hereby, TBARS and H2O2 contents were similar to the As-treated group. Our findings from alone or combined application of PS and PMMA provide new information to advance the tolerance mechanism against As exposure in L. minor.

Medienart:

E-Artikel

Erscheinungsjahr:

2023

Erschienen:

2023

Enthalten in:

Zur Gesamtaufnahme - volume:196

Enthalten in:

Free radical biology & medicine - 196(2023) vom: 20. Feb., Seite 93-107

Sprache:

Englisch

Beteiligte Personen:

Ozfidan-Konakci, Ceyda [VerfasserIn]
Yildiztugay, Evren [VerfasserIn]
Arikan, Busra [VerfasserIn]
Alp-Turgut, Fatma Nur [VerfasserIn]
Turan, Metin [VerfasserIn]
Cavusoglu, Halit [VerfasserIn]
Sakalak, Huseyin [VerfasserIn]

Links:

Volltext

Themen:

1406-65-1
9011-14-7
Antioxidant
Antioxidants
Arsenic
Ascorbic Acid
BBX060AN9V
Chlorophyll
Chlorophyll a fluorescence transient
EC 1.15.1.1
GAN16C9B8O
Glutathione
Hydrogen Peroxide
Journal Article
Metals, Heavy
Microplastics
N712M78A8G
Nanoplastic
PQ6CK8PD0R
Polymethyl Methacrylate
Polymethyl methacrylate
Polystrene
Polystyrenes
Reactive Oxygen Species
Review
Superoxide Dismutase
Thiobarbituric Acid Reactive Substances

Anmerkungen:

Date Completed 06.02.2023

Date Revised 22.02.2023

published: Print-Electronic

Citation Status MEDLINE

doi:

10.1016/j.freeradbiomed.2023.01.015

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM351684905