Synthetic pyrethroid contamination in water is a serious environmental concern as this pesticide is highly toxic to aquatic animals. Phytoremediation using aquatic plants that can tolerate and accumulate pyrethroid pesticides is an interesting alternative. In this study, the phytotoxicity of cypermethrin and deltamethrin, alone or in combination, to three aquatic plants, Azolla microphylla, Salvinia cucullate, and Spirodela polyrrhiza were tested. The results show that S. cucullate was the most sensitive species because the pigment content in the fronds significantly decreased when exposed to pyrethroid in water. Azolla microphylla was the most tolerant species because the pigment content in their fronds significantly increased when exposed to pyrethroid and cypermethrin, which could also significantly increase the plant fresh weight of A. microphylla. Both species could accumulate synthetic pyrethroid pesticides in their tissue. The bioconcentration factors of cypermethrin and deltamethrin in A. microphylla were 3,508.8 and 2,323.5, respectively, while the bioconcentration factors of cypermethrin and deltamethrin in S. cucullate were 453.0 and 381.7, respectively. Azolla microphylla is appropriate for use in pyrethroid phytoremediation in water.

• Arnon, D. I. (1949). Copper enzymes in isolated chloroplasts. Polyphenoloxidase in Beta vulgaris. Plant Physiology, 24(1), 1–15. https://doi.org/10.1104/pp.24.1.1

• Aveek, S., Jyoti, P. S., Jaydeb, J., & Somashree, M. (2019). Effect of cypermethrin on growth, cell division and photosynthetic pigment content in onion, maize and grass pea. Research Journal of Chemistry and Environment, 23(8), 126-129.

• Ayad, M. A., Fdil, M. A., & Mouabad, A. (2011). Effects of cypermethrin (pyrethroid insecticide) on the valve activity behavior, byssal thread formation, and survival in air of the marine mussel Mytilus galloprovincialis. Archives of Environmental Contamination and Toxicology, 60, 462-470. https://doi.org/10.1007/s00244-010-9549-7

• Ensminger, M., Bergin, R., Spurlock, F., & Goh, K. S. (2011). Pesticide concentrations in water and sediment and associated invertebrate toxicity in Del Puerto and Orestimba Creeks, California, 2007–2008. Environmental Monitoring and Assessment, 175, 573-587. https://doi.org/10.1007/s10661-010-1552-y

• Iha, D. S., & Bianchini Jr., I. (2015). Phytoremediation of Cd, Ni, Pb and Zn by Salvinia minima. International Journal of Phytoremediation, 17(10), 929-935. https://doi.org/10.1080/15226514.2014.1003793

• John, R., Ahmad, P., Gadgil, K., & Sharma, S. (2008). Effect of cadmium and lead on growth, biochemical parameters and uptake in Lemna polyrrhiza L. Plant Soil and Environment, 54(6), 262–270. https://doi.org/10.17221/2787-PSE

• Karmakar, S., Mukherjee, J., & Mukherjee, S. (2016). Removal of fluoride contamination in water by three aquatic plants. International Journal of Phytoremediation, 18(3), 222-227. https://doi.org/10.1080/15226514.2015.1073676

• Kooh, M. R. R., Lim, L. B. L., Lim, L., & Malik, O. A. (2018). Phytoextraction potential of water fern (Azolla pinnata) in the removal of a hazardous dye, methyl violet 2B: Artificial neural network modelling. International Journal of Phytoremediation, 20(5), 424-431. https://doi.org/10.1080/15226514.2017.1365337

• Maneepitak, S., & Cochard, R. (2014). Uses, toxicity levels, and environmental impacts of synthetic and natural pesticides in rice fields – A survey in Central Thailand. International Journal of Biodiversity Science, Ecosystem Services and Management, 10(2), 144-156. https://doi.org/10.1080/21513732.2014.905493

• Mugni, H., Demetrio, P., Bulus, G., Ronco, A., & Bonetto, C. (2011). Effect of aquatic vegetation on the persistence of cypermethrin toxicity in water. Bulletin of Environmental Contamination and Toxicology, 86, 23–27. https://doi.org/10.1007/s00128-010-0143-5

• Prado, C., Chocobar-Ponce, S.,Pagano, E., Prado, F., & Rosa, M. (2021). Differential effects of Zn concentrations on Cr(VI) uptake by two Salvinia species: Involvement of thiol compounds. International Journal of Phytoremediation, 23(1), 10-17. https://doi.org/10.1080/15226514.2020.1786796

• Prasad, S. M., Singh, A., & Singh, P. (2015). Physiological, biochemical and growth responses of Azolla pinnata to chlorpyrifos and cypermethrin pesticides exposure: A comparative study. Chemistry and Ecology, 31(3), 285-298. https://doi.org/10.1080/02757540.2014.950566

• Rahman, M. A., & Hasegawa, H. (2011). Aquatic arsenic: Phytoremediation using floating macrophytes. Chemosphere, 83(5), 633-646. http://doi.org/10.1016/j.chemosphere.2011.02.045

• Rai, P. K. (2008). Technical note: Phytoremediation of Hg and Cd from industrial effluents using an aquatic free floating macrophyte Azolla pinnata. International Journal of Phytoremediation, 10(5), 430-435. https://doi.org/10.1080/15226510802100606

• Riaz, G., Tabinda, B. A., Iqbal, S., Yasar, A., Abbas, M., Khan, A. M., Mahfooz, Y., & Baqar, M. (2017). Phytoremediation of organochlorine and pyrethroid pesticides by aquatic macrophytes and algae in freshwater systems. International Journal of Phytoremediation, 19(10), 894-898. https://doi.org/10.1080/15226514.2017.1303808

• Sangchan, W., Bannchan, M., Ingwerson, J., Hugenschmidt, C., Schwadorf, K., Thavornyutikarn, P., Pansombat, K., & Streck, T. (2014). Monitoring and risk assessment of pesticides in a tropical river of an agricultural watershed in northern Thailand. Environment and Monitoring Assessment, 186, 1083–1099. https://doi.org/10.1007/s10661-013-3440-8

• Somtrakoon, K., & Chouychai, W. (2023). Phytoremediation potential of Ceratophyllum sp. on arsenic-contaminated conditions. Journal of Agricultural Sciences - Sri Lanka, 18(2), 183-192. http://doi.org/10.4038/jas.v18i2.10252

• Steinwandter, H. (1985). Universal 5 min on-line method for extracting and isolating pesticide residues and industrial chemicals. Fresenius’ Zeitschriftfuer Analytische Chemie, 322, 752-754. https://doi.org/10.1007/BF00489393

• Su, C., Jiang, Y., Li, F., Yang, Y., Lu, Q., Zhang, T., Hu, D., & Xu, Q. (2017). Investigation of subcellular distribution, physiological, and biochemical changes in Spirodela polyrhiza as a function of cadmium exposure. Environmental and Experimental Botany, 142, 24-33. https://doi.org/10.1016/j.envexpbot.2017.07.015