4. Conclusion
In the present study, napiergrass accumulated high concentrations of Cs in its aboveground large biomass. Strong positive correlations were found between dry matter weight and Cs content in the aboveground parts in all Cs-treated plants. The results of the present study therefore indicate that napiergrass may be a candidate plant with a high potential for phytoremediation of Cs-137 from Cs-contaminated soil. Another advantage of napiergrass is the impossibility of Cs dispersal via seed after remediation because it reproduces vegetatively, and therefore does not produce seed. Further studies must investigate a transporter related to Cs uptake to confirm the remediation power of napiergrass in the Cs-contaminated sites located in Fukushima Prefecture, Japan.