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Effect of soil HHCB on cadmium accumulation and phytotoxicity in wheat seedlings
Cuihong Chen1, Qixing Zhou, Zhang Cai
1Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, China.
Abstract:
The accumulation of cadmium (Cd) in wheat seedlings under single and joint stress of galaxolide (HHCB) and Cd was investigated, and their phytotoxicity and oxidation stress including chlorophyll (CHL), malondialdehyde (MDA), superoxide dismutase, and perosidase were assessed. The results showed that the accumulation of Cd in wheat seedlings increased with an increase in the concentration of Cd in soil. The low concentration of HHCB inhibited the accumulation of Cd, while the high concentration of HHCB induced the accumulation of Cd. The content of CHL increased significantly in treatments with 1-50 mg kg(-1) Cd. However, the content of CHL under joint stress of Cd and HHCB was significantly lower than that in the control. Besides, the content of MDA in wheat leaves and roots was also significantly affected by HHCB and Cd, particularly by their joint stress. Co-contamination of HHCB significantly affected the activity of antioxidant enzymes in wheat seedlings stressed by Cd. In a word, HHCB could aggravate the phytotoxicity of Cd to wheat seedlings.
