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| Uptake and Release of Inorganic Arsenic by Hydrilla verticillata(L.f.) Royle |
| Received:April 12, 2015 |
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| KeyWord:Hydrilla verticillata;arsenic;uptake;efflux |
| Author Name | Affiliation | | XUE Pei-ying | College of Resources and Environmental Sciences, Agriculture University of Hebei, Baoding 071001, China | | CHEN Miao-miao | Science and Technology Research Institute, Agriculture University of Hebei, Baoding 071001, China | | GENG Li-ping | College of Resources and Environmental Sciences, Agriculture University of Hebei, Baoding 071001, China | | ZHAO Quan-li | Farm of Teaching and Experimentation, Agriculture University of Hebei, Baoding 071001, China | | WANG Ya-qiong | College of Resources and Environmental Sciences, Agriculture University of Hebei, Baoding 071001, China |
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| Abstract: |
| Hydrilla verticillata(L.f.) Royle is a widespread submerged macrophyte in aquatic environments and shows high arsenic(As) acmulation. Hence, comprehensive understanding of uptake and release as well as species transformation of As in H. verticillata is essential for the development of phytoremediation technologies. Simulation experiments were conducted to investigate the uptake and efflux of AsⅤ and AsⅢ by H. verticillata cultivated in solution. Results showed that:the highest influx rates(Vmax) of AsⅤ and AsⅢ were 105 and 96.1 nmol·g-1 DW·min-1, respectively, with no significant difference in Vmax between AsⅤ and AsⅢ treatments(P >0.05). Regardless of As species supplied, AsⅢ was the predominant species in plant(> 90% of total extractable As). AsⅤ was rapidly taken up by H. verticillata from the growth medium, and then reduced to AsⅢ that released to the external solution(The ratios of AsⅢ efflux to AsⅤ uptake was 53%). Phosphorus addition significantly inhibited the uptake of AsⅤ by H. verticillata, with plant AsⅢ being 2/3 less than in-P treatment, but had little effects on AsⅢ uptake, resulting in the predominance of AsⅤ species in the external solution(over 90% of total As). BSO, a synthetic inhibitor of PCs, significantly reduced AsⅤ and AsⅢ accumulation in H. verticillata(AsⅢ concentration in the plant shoots was only 8% and 10% of that in the control, respectively). However, there were no differences in As species in solution between with and without BSO treatments. In conclusion, H. verticillata shows high capacity for As accumulation, but the rapid reduction of AsⅤ to AsⅢ followed by leakage of AsⅢ may limit the application of this plant in As phytoremediation. |
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