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Zinc Oxide Nanoparticles Application Alleviates Arsenic (As) Toxicity in Soybean Plants by Restricting the Uptake of as and Modulating Key Biochemical Attributes, Antioxidant Enzymes, Ascorbate-Glutathione Cycle and Glyoxalase System

1
Botany and Microbiology Department, College of Science, King Saud University, 11451 Riyadh, Saudi Arabia
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University of Agriculture Faisalabad, Faisalabad 38040, Pakistan
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Soil Science and Plant Nutrition Department, Agriculture Faculty, Harran University, 63210 Sanliurfa, Turkey
4
Department of Biology and Ecology of Plants, Faculty of Biology, University of Bialystok, 15-245 Bialystok, Poland
*
Author to whom correspondence should be addressed.
Plants 2020, 9(7), 825; https://doi.org/10.3390/plants9070825
Received: 28 May 2020 / Revised: 19 June 2020 / Accepted: 20 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Plant Oxidative Stress: Biology, Physiology and Mitigation)
Accumulation of arsenic (As) in soils is increasing consistently day-by-day, which has resulted in increased toxicity of this element in various crop plants. Arsenic interferes with several plant metabolic processes at molecular, biochemical and physiological levels, which result in reduced plant productivity. Hence, the introduction of novel ameliorating agents to combat this situation is the need of the hour. The present study was designed to examine the effect of zinc oxide nanoparticles (ZnO–NPs) in As-stressed soybean plants. Various plant growth factors and enzymes were studied at varying concentrations of As and ZnO–NPs. Our results showed that with the application of ZnO–NPs, As concentration declined in both root and shoot of soybean plants. The lengths of shoot and root, net photosynthetic rate, transpiration, stomatal conductance, photochemical yield and other factors declined with an increase in external As level. However, the application of ZnO–NPs to the As-stressed soybean plants resulted in a considerable increase in these factors. Moreover, the enzymes involved in the ascorbate–glutathione cycle including superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX) and glutathione reductase (GR) showed a significant increase in their activity with the application of ZnO–NPs to the As-stressed plants. Hence, our study confirms the significance of ZnO–NPs in alleviating the toxicity of As in soybean plants. View Full-Text
Keywords: arsenic stress; soybean; growth; antioxidant enzymes; ascorbate–glutathione cycle; glyoxalase system arsenic stress; soybean; growth; antioxidant enzymes; ascorbate–glutathione cycle; glyoxalase system
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Ahmad, P.; Alyemeni, M.N.; Al-Huqail, A.A.; Alqahtani, M.A.; Wijaya, L.; Ashraf, M.; Kaya, C.; Bajguz, A. Zinc Oxide Nanoparticles Application Alleviates Arsenic (As) Toxicity in Soybean Plants by Restricting the Uptake of as and Modulating Key Biochemical Attributes, Antioxidant Enzymes, Ascorbate-Glutathione Cycle and Glyoxalase System. Plants 2020, 9, 825.

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