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Lead (Pb) bioaccumulation and antioxidative responses in Tetraena qataranse.
- Source :
-
Scientific reports [Sci Rep] 2020 Oct 13; Vol. 10 (1), pp. 17070. Date of Electronic Publication: 2020 Oct 13. - Publication Year :
- 2020
-
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.
- Subjects :
- Antioxidants metabolism
Ascorbate Peroxidases metabolism
Bioaccumulation
Biodegradation, Environmental
Catalase metabolism
Glutathione Reductase metabolism
Humans
Peroxidase metabolism
Plant Proteins metabolism
Qatar
Soil Pollutants pharmacokinetics
Soil Pollutants toxicity
Superoxide Dismutase metabolism
Zygophyllaceae growth & development
Lead pharmacokinetics
Lead toxicity
Zygophyllaceae drug effects
Zygophyllaceae metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 2045-2322
- Volume :
- 10
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Scientific reports
- Publication Type :
- Academic Journal
- Accession number :
- 33051495
- Full Text :
- https://doi.org/10.1038/s41598-020-73621-z