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| Effects of Boron Concentrations on Uptake of Boron and Heavy Metals by Three Hyperaccumulators |
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| KeyWord:boron; hyperaccumulator; zinc; nickel |
| Author Name | Affiliation | | LIU Deng-biao | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | JIANG Cheng-ai | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | ZHANG Jia-hui | Animal and Poultry Products Quality Control, Inspection and Testing Center, Ministry of Agriculture, Guangzhou 510642, China | | ZHAO Tao | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China |
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| Abstract: |
| Boron（B） is an essential micronutrient for the growth of higher plants. This research was aimed to investigate the effects of different concentrations of boron（0~15 mg B·L-1） on the growth of and B, Zn and Ni uptake by Zn/Cd hyperaccumulator Sedum alfredii, Zn/Cd/Ni hyperaccumulator Noccaea caerulescens and Ni hyperaccumulator Alyssum murale. The growth and metal uptake of three hyperaccumulators were enhanced by B at low concentrations in the nutrient solution, but inhibited at higher concentrations. These hyperaccumulators showed toxic symptoms at B concentrations greater than 10.0 mg B·L-1. The accumulation of B in the shoots of three hyperaccumulators increased with increasing solution B concentrations. It ranged from 40.2~880 mg·kg-1, 115~744 mg·kg-1, and 156~922 mg·kg-1（in dry weight） for S. alfredii leaves, N.caerulescens shoots and A. murale shoots, respectively. Metal accumulations in the shoots of S. alfredii and N. caerulescens were greatest, respectively, at 2.0 mg B·L-1 and 0.5 mg B·L-1 of solution B concentrations. Alyssum murale accumulated greatest Zn and Ni in the shoots at 2.0 mg B·L-1 and 5.0 mg B·L-1, respectively. |
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