Arsenic hyperaccumulator Pteris Vittata L. and its arsenic accumulation
- 356 Downloads
An arsenic hyperaccumulator Pteris vittata L. (Chinese brake) was first discovered in China by means of field survey and greenhouse cultivation. Field survey showed that Chinese brake had large accumulating capacity to arsenic; the orders of arsenic content in different parts of the fern were as follows: leaves>leafstalks>roots, which is totally different from that of ordinary plants; bioaccumulation coefficients of the above ground parts of the fern decreased as a power function of soil arsenic contents. In the control of pot trials with normal unpolluted soil containing 9 mg/kg of arsenic, the bioaccumulation coefficients of the above ground parts and rhizoids of Chinese brake were as high as 71 and 80 respectively. Greenhouse cultivation in the contaminated soil from mining areas has shown that more than 1 times greater arsenic can be accumulated in the leaves of the fern than that of field samples with the largest content of 5070 mg/kg As on a dry matter basis. During greenhouse cultivation, arsenic content in the leaves of the fern increased linearly with time prolonging. Not only has Chinese brake extraordinary tolerance and accumulation to arsenic, but it grew rapidly with great biomass, wide distribution and easy adaptation to different environmental conditions as well. Therefore, it has great potential in future remediation of arsenic contamination. It also demonstrates important value for studies of arsenic physiology and biochemistry such as arsenic absorption, translocation and detoxification mechanisms in plants.
Keywordshyperaccumlator Chinese brake arsenic bioaccumulation coefficients
Unable to display preview. Download preview PDF.
- 1.Wu, Q. T., Chen, T. B., Translocation of Heavy Metal in Terrestrial Ecosystem and Its Simulation Software (in Chinese), Beijing: China Agricultural Press, 1997, 189.Google Scholar
- 2.Wei, C. Y., Chen, T. B. Hyperaccumulators and phytoremediation of heavy metal contaminated soils: a review of studies in China and abroad, Acta Ecologica Sinica (in Chinese), 2000. 21: 1196.Google Scholar
- 6.Chen, T. B., Wei, C. Y., Arsenic hyperaccumulation in some plant species in South China, Proceedings of International Conference of Soil Remediation, 194–195. Oct. 15–19, 2000, Hangzhou, China.Google Scholar
- 8.Page, A. L., Miller, R. H., Keeney, D. R., Methods of Soil Analysis. Part 2-Chemical and Microbiological Properties (2nd ed.), Wisconsin: ASA-SSSA Pub., 1982, 385–402.Google Scholar
- 9.Liebig, G. F. Jr., Arsenic (ed. Chapman, H. D.), Diagnostic Criteria for Plants and Soils. Texas, Quality Printing Company Inc., 1973, 13–23.Google Scholar
- 10.Baker, A. J. M., Brooks, R. R., Terrestrial higher plants which hyperaccumulate metallic elements-a review of their distribution, ecology and phytochemistry, Biorecovery, 1989, 1: 81.Google Scholar
- 11.Editorial Committee for Flora of the Chinese Academy of Sciences, Flora of China (Vol. 3, section1).(in Chinese), Beijing: Science Press, 1990. 15–87.Google Scholar
- 12.Kabata-Pendias, A., Pendias, H. Trace Elements in Soils and Plants, Boca Raton: CRC Press, 1991, 203–209.Google Scholar
- 13.Liao, Z. J., The contamination and hazardousness of heavy metals in the environment (in Chinese), Beijing: Science Press, 1989, 101–138.Google Scholar