Environmental Chemistry

ISSN 0254-6108

CN 11-1844/X

Vol. 38 No. 5
May  2019
Article Contents

Citation:

Effects of combined contamination of multi-walled carbon nanotubes and cadmium on the growth of rice

  • Received Date: 2018-06-28
    Fund Project:

    Supported by the National Natural Science Foundation of China (41373108, 41702176) and the Technological Program of Huaibei Mining Industry Group (2018-HBKJ-1).

  • Rice (Oryza sativa) seedlings were co-cultured with multi-walled carbon nanotubes (MWCNTs) and cadmium (Cd) of different concentrations to explore the effects of combined contamination on their growth. The results showed that the growth of rice seedlings was negatively related with the concentration of MWCNTs in the single treatment of MWCNTs. Low concentration of MWCNTs (1.5 mg·L-1) inhibited the growth of rice seedlings, whereas higher concentrations (≥ 6.0 mg·L-1) significantly (P<0.05) inhibited its growth. The addition of 5mg·L-1 Cd2+ enhanced the growth inhibition of MWCNTs on rice seedlings. When the concentrations of MWCNTs increased from1.5 to 12 mg·L-1, the root vigors of rice seedlings decreased by 6.4%, 10.4%, 24.4% and 13.9% in comparison with the composite treatment groups, respectively. The chlorophyll contents were significantly reduced, and the peroxidase activity of rice leaves in the composite treatment groups were 11.0%, 46.1%, 5.6%, and 11.6%, respectively, which were slightly higher than those in the single treatment group. The leaf stomatal conductance of rice seedlings decreased. The intercellular CO2 concentration increased, whereas the photosynthetic rate and leaf stomatal conductance of rice seedlings decreased. It was indicated that MWCNTs and Cd2+ had obvious synergistic effects on the growth of rice seedlings.
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Effects of combined contamination of multi-walled carbon nanotubes and cadmium on the growth of rice

  • 1. School of Resource and Environmental Engineering, Collaborative Innovation Center for Mines Environmental Remediation and Wetland Ecological Security, Anhui University, Hefei, 230601, China;
  • 2. Huainan Normal University, Huainan, 232001, China
Fund Project:  Supported by the National Natural Science Foundation of China (41373108, 41702176) and the Technological Program of Huaibei Mining Industry Group (2018-HBKJ-1).

Abstract: Rice (Oryza sativa) seedlings were co-cultured with multi-walled carbon nanotubes (MWCNTs) and cadmium (Cd) of different concentrations to explore the effects of combined contamination on their growth. The results showed that the growth of rice seedlings was negatively related with the concentration of MWCNTs in the single treatment of MWCNTs. Low concentration of MWCNTs (1.5 mg·L-1) inhibited the growth of rice seedlings, whereas higher concentrations (≥ 6.0 mg·L-1) significantly (P<0.05) inhibited its growth. The addition of 5mg·L-1 Cd2+ enhanced the growth inhibition of MWCNTs on rice seedlings. When the concentrations of MWCNTs increased from1.5 to 12 mg·L-1, the root vigors of rice seedlings decreased by 6.4%, 10.4%, 24.4% and 13.9% in comparison with the composite treatment groups, respectively. The chlorophyll contents were significantly reduced, and the peroxidase activity of rice leaves in the composite treatment groups were 11.0%, 46.1%, 5.6%, and 11.6%, respectively, which were slightly higher than those in the single treatment group. The leaf stomatal conductance of rice seedlings decreased. The intercellular CO2 concentration increased, whereas the photosynthetic rate and leaf stomatal conductance of rice seedlings decreased. It was indicated that MWCNTs and Cd2+ had obvious synergistic effects on the growth of rice seedlings.

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