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| Effects of Nano-silver on Growth Characteristics of Perennial Ryegrass |
| Received:November 02, 2014 |
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| KeyWord:nano-silver;root system;phytotoxicity;ryegrass |
| Author Name | Affiliation | E-mail | | WANG Rong | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | LIU Yan-li | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | ZHANG Min | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | GAO Xiang | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | LI Cheng-liang | National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | chengliang_li11@163.com |
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| Abstract: |
| Nanoscale-silver containing products have been widely utilized in the industrial and domestic manufactures. Thus nano-silver particles may enter the terrestrial environment. However, there is little information available about the influence of nano-silver on plant growth. A pot experiment was carried out to examine the effect of nano-silver on the growth of and nano-silver residues in perennial ryegrass in comparison with AgNO3 treatment. Results showed that the inhibitory effect of nano-silver and AgNO3 on the root was significantly greater than on the aboveground. When the concentration of nano-silver was at 20 mg·kg-1 in soil, the greatest ratios of root to shoot were all recorded as 2.43 and 2.33 in nano-silver and AgNO3 treatments, respectively. Additions of silver decreased the biomass, root length and root number of ryegrass, but increased the average diameter of roots until 20 mg·kg-1 of nano-silver in soil. Nano-silver showed greater inhibition of ryegrass root system than AgNO3 did. This suggested that the toxicity mechanism of nano-silver to plant was not only silver ion from nano-silver, but also the small particle size and high active surface. The present results would provide valuable information on the environmental risk assessment and remediation of of nano-silver pollution. |
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