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Effects of melatonin on cadmium accumulation in the accumulator plant Perilla frutescens
- Xiang, Gang, Lin, Lijin, Liao, Ming’an, Tang, Yi, Liang, Dong, Xia, Hui, Wang, Jin, Wang, Xun, Sun, Guochao, Zhang, Huifen, Zou, Yao, Ren, Wei
- Chemistry in ecology 2019 v.35 no.6 pp. 553-562
- Perilla frutescens, cadmium, chlorophyll, dose response, enzyme activity, heavy metals, melatonin, peroxidase, phytoremediation, polluted soils, roots, shoots, superoxide dismutase
- To enhance the phytoremediation ability of the heavy metal accumulator Perilla frutescens, melatonin (MT) was applied at different concentrations (0, 25, 50, 100, 150, and 200 μmol/L) to P. frutescens growing in cadmium (Cd) contaminated soil (10 mg/kg). The MT treatments increased the root and shoot biomasses of P. frutescens, with the maximum increase in the 150 μmol/L MT treatment (79.51% and 36.18% higher, respectively, than those of the control). The MT treatments also enhanced superoxide dismutase activity, peroxidase activity, and the soluble protein concentration of P. frutescens, and 100–200 μmol/L MT increased the chlorophyll a, chlorophyll b, and total chlorophyll concentrations in P. frutescens. The MT treatments increased the Cd concentrations in roots and shoots of P. frutescens in a dose-dependent manner. Different MT concentrations increased the Cd accumulation amounts of roots and shoots of P. frutescens, with the maxima accumulation amounts in the 150 μmol/L MT treatment (226.98% and 85.89% higher, respectively, than those of the control). These results show that MT can promote the growth and phytoremediation ability of P. frutescens growing in Cd-contaminated soil, and the optimum MT dose is 150 μmol/L.