Insights into the growth and biochemical defense responses associated with fenitrothion toxicity and uptake by freshwater cyanobacteria

被引：0
作者：
Hamed S.M. [1 ,2 ]
Mohamed M.Y.A. [1 ]
Alammari B.S. [1 ]
AbdElgawad H. [3 ,4 ]
机构：
[1] Department of Biology, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), P. O. Box: 90950, Riyadh
[2] Soil Microbiology Department, Soils, Water and Environment Research Institute, Agricultural Research Center, P.O. 175 El‒Orman, Giza
[3] Department of Botany and Microbiology, Faculty of Science, Beni-Suef University, Beni-Suef
[4] Integrated Molecular Plant Physiology Research, Department of Biology, University of Antwerp, Antwerp
来源：
Chemosphere | 2024年 / 358卷
关键词：
Antioxidants; Bioremoval; Cyanobacteria; Fenitrothion; Oxidative stress; Photosynthesis;
D O I：
10.1016/j.chemosphere.2024.141909
中图分类号：
学科分类号：
摘要：
The extensive use of fenitrothion (FNT) in agricultural practices induces its persistence in soil and waterways. Therefore, it is essential to implement effective management practices such as using cyanobacteria for FNT removal and accumulation, particularly under accidental contamination. To this end, we evaluated the responses of two freshwater cyanobacteria taxa, Nostoc muscorum and Anabaena laxa to mild (7.5 mg L−1) and high (15 mg L−1) levels of FNT over a period of 7 d. Compared to N. muscorum, A. laxa was more tolerant to FNT, exhibiting higher FNT uptake and removal efficiencies at mild (16.3%) and high (17.5%) levels. FNT induced a dose-dependent decrease in cell growth, Chl a, phosphoenolpyruvate carboxylase and ribulose-1,5-bisphosphate carboxylase/oxygenase activities, which were more pronounced in N. muscorum. Moreover, FNT significantly increased oxidative damage markers i.e., increased lipid peroxidation (MDA), protein oxidation, H2O2 levels and NADPH oxidase enzyme activity, to more extent in N. muscorum. Compared to N. muscorum, A. laxa had high antioxidant capacity (FRAP), glutathione and increased activities of glutathione-S-transferase, glutathione reductase, glutathione peroxidase and superoxide dismutase, suggesting a robust antioxidant defense mechanism to mitigate FNT toxicity. However, N. muscorum devoted the induction of ascorbate content and the activity of catalase, peroxidase, monodehydroascorbate reductase, ascorbate peroxidase, and dehydroascorbate reductase enzymes. Although A. laxa had greater intracellular FNT, it experienced less FNT-induced oxidative stress, likely due to over production of antioxidants. Consequently, A. laxa is considered as a promising candidate for FNT phycoremediation. Our findings provide fundamental information on species-specific toxicity of FNT among cyanobacteria and the environmental risk of FNT toxicity in aquatic environments. © 2024
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