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Lead (Pb) bioaccumulation and antioxidative responses in Tetraena qataranse

Usman, Kamal, Abu-Dieyeh, Mohammed H., Zouari, Nabil, Al-Ghouti, Mohammad A.·2020·Scientific Reports
DOI 10.1038/s41598-020-73621-z
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Abstract

Lead (Pb) is the second most toxic metal on Earth and is toxic to humans and other living things. In plants, Pb commonly inhibits growth when it is at a concentration in the soil of 30 mg/kg or more but several Pb tolerant plants have been reported. However, few studies have focused on plant response to Pb exposure, particularly at concentrations higher than 30 mg/kg. The assessment and evaluation of metal dose-dependent plant responses will assist in future phytoremediation studies. Therefore, this work documents the Pb concentration-dependent antioxidative response in Tetraena qataranse. Young seedlings were irrigated with 0, 25, 50, and 100 mg/L Pb every 48 h for seven weeks under greenhouse conditions. A phytotoxicity test showed that at the lowest treatment concentration, Pb stimulates growth. However, at 100 mg/L (1600 mg/kg Pb in the growth medium at harvest), the metal disrupted healthy growth in T. qataranse, particularly root development. Metal accumulation in the root was higher (up to 2784 mg/kg) than that of the shoot (1141.6 mg/kg). Activity assays of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), guaiacol peroxidase (GPX), and glutathione reductase (GR) showed a progressive increase in enzymatic activities due to Pb treatment. Together, the results of this study suggest that T. qataranse is a Pb hyperaccumulator. Increased antioxidant enzyme activity was essential to maintaining cellular homeostasis and assisted in the arid plant’s tolerance to Pb stress.

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Metadata

Authors
Usman, K., Abu-Dieyeh, M. H., Zouari, N., & Al-Ghouti, M. A.
Venue
Scientific Reports
Publisher
Springer Science and Business Media LLC
Published
2020-10-13
Volume
10
Issue
1
ISSN
2045-2322
DOI
10.1038/s41598-020-73621-z
Cited by
98
References
0
Language
en
Licence
Funders
Qatar University (QUST-2-CAS-2019-26)

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CoChat. (2026). Citation check: Lead (Pb) bioaccumulation and antioxidative responses in Tetraena qataranse. https://app.cochat.ai/papers/10.1038/s41598-020-73621-z
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Usman, K., Abu-Dieyeh, M. H., Zouari, N., & Al-Ghouti, M. A. (2020). Lead (Pb) bioaccumulation and antioxidative responses in Tetraena qataranse. Scientific Reports. https://doi.org/10.1038/s41598-020-73621-z

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