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Accumulation characteristics of Zn and Cu in cuttings of Salix matsudana Koidz under hydroponic eutrophication condition(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2019 03
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Accumulation characteristics of Zn and Cu in cuttings of Salix matsudana Koidz under hydroponic eutrophication condition
YUAN Liuhuan1 WAN Pengwei1 LI Qiang1 WANG Yan2 GUAN Xin3 WU Xiaoqiao3 & TIAN Xingjun1**
1 School of Life Sciences, Nanjing University, Nanjing 210023, China 2 Shanghai Forestry General Station, Shanghai 200072, China 3 Jiangsu Forestry Bureau, Nanjing 210036, China
hydroponics Salix matsudana Koidz heavy metal eutrophication

The effect of heavy metal pollution on growth characteristics, physiological indexes, and heavy metal accumulation was explored under eutrophication conditions using hydroponically growing Salix matsudana cuttings. The results showed that under the 50 μmol/L Cu treatment condition, cutting growth was significantly inhibited and the physiological response to stunted growth was induced, with decreasing dry weight, RGR, tolerance index (TI), and amount of photosynthetic pigment, as well as increasing MDA content and POD activity. The damage, as a result of 50 μmol/L Cu treatment in S. matsudana was more serious than that with 50 μmol/L Zn treatment. With the increase in N and P concentration, biomass increased while MDA content and POD activity decreased. Eutrophication could alleviate the damage caused by heavy metals on S. matsudana. Cu and Zn were mainly accumulated in the roots of S. matsudana cuttings. With the increase in N and P concentrations, the amount of Cu and Zn that accumulates in the root of S. matsudana cuttings decreased significantly. Accumulation of Zn in the root of S. matsudana cuttings increased when translocation factors (TF) and the transport of Zn to the shoot decreased as a result of Cu treatment. Using a combination of N and P treatments (N0 + P0, N1.5 + P0.18 and N15 + P1.8, the same below), the TF of Zn under Zn50 + Cu50 treatments significantly decreased by 62.8%, 57.0%, and 77.9%, respectively, (P < 0.05) compared with that with Zn50 only. However, the accumulation of Cu in the root of S. matsudana cuttings reduced while TF and the transport of Cu to the shoot was promoted by Zn. Using the three combinations of N and P, the TF of Cu under Zn50 + Cu50 treatments significantly increased by 26.0%, 62.9%, and 42.9% (P < 0.05) compared with treatment with Cu50 only. The transport of Zn to the shoot significantly increased with the increase in N and P concentration, but the transport of Cu did not change significantly. Compared with treatment with N0 + P0 + Zn50, the TF of Zn increased by 45.6% and 247.3% (P < 0.05) under N1.5 + P0.18 + Zn50 and N15 + P1.8 + Zn50 treatment conditions, respectively. In summary, S. matsudana has a strong ability to accumulate Cu and Zn. With the increase in N and P concentration, the toxicity of heavy metals on S. matsudana could be alleviated, and the accumulation of Cu and Zn in the root decreased while the transport of Zn to shoot increased.


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