... 2004AbstractPterisvittata(Chinesebrakefern) ,the rstreportedarsenic(As)hyperaccumulatingplant,canbepotentiallyappliedinthephytoremediationof As-contaminated sites. Understanding the mechanisms of As tolerance and detoxification ... primarilylocated in the upper and lower epidermal cells, probably in the vacuoles [9]. Thiol-containing compounds, e.g. glu-tathione (GSH) and phytochelatins (PCs) are considered to be the ligands of ... longifolia and Pteris umbrosa [5–7], can be potentially used for phytore-mediation of As-contaminated sites. In these As hyperaccu-mulating ferns, As is mainly accumulated in their fronds, and only inorganic...