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| Boron tolerance and accumulation in Kochia scoparia |
| Received:November 03, 2017 |
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| KeyWord:Kochia scoparia;B toxicity;B tolerance;bioconcentration factor;phytoremediation |
| Author Name | Affiliation | E-mail | | LU Qiao | Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Sciences, Tianjin Normal University, Tianjin 300387, China | | | DAI Zheng | Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China | | | CUI Meng-ying | Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China | | | MA Cheng-cang | Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Sciences, Tianjin Normal University, Tianjin 300387, China | | | LIU Chun-guang | Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China | liuchunguang@nankai.edu.cn |
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| Abstract: |
| To evaluate the capacity of boron (B) tolerance and accumulation in Kochia scoparia, hydroponic studies were conducted. Seedlings of K. scoparia were cultivated in solutions with B concentrations of 0 (control), 10, 20, 30, 40, 80 mg·L-1 and 120 mg·L-1, respectively. The biomass, B accumulation and enzymatic activity were determined after 15-d cultivation. The results show that K. scoparia was able to grow normally at B supply concentrations ranging from 0 to 30 mg·L-1. The biomass of K. scoparia decreased significantly with increasing B supply concentrations at B supply concentrations greater than 30 mg·L-1. At B concentration of 120 mg·L-1, the biomass of root, stem and leaf of K. scoparia decreased by 56.0%, 72.2% and 71.4%, respectively, compared to the control. Moreover, with increasing B supply concentrations, plant B concentrations increased gradually. At B supply concentration of 120 mg·L-1, the plant B concentration in K. scoparia was 4000 mg·kg-1. The BCF and TF values of K. scoparia were all greater than 1, and even greater than 20 for shoot BCF values, indicating a outstanding capacity of accumulating B for K. scoparia. With increasing B supply concentrations, the POD and SOD activities in K. scoparia increased firstly and then decreased and the CAT activity increased all the time, indicating that the defense system of active oxygen of K. scoparia was well-organised under B stress. Our results suggest that, K. scoparia has a considerable tolerance to B and is able to accumulate high level of B, due to the defense system of active oxygen of it. Therefore, K. scoparia is considered as a potential candidate for the phytoremediation of high-B soil. |
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