Arsenic transformation in the growth media and biomass of hyperaccumulator Pteris vittata L.

Interactions of arsenic and phenanthrene on their uptake and antioxidative response in Pteris vittata L.

“…It is well recognized phosphorus inhibited As(V) uptake of P. vitatta (Verbruggen et al, 2009;Zhao et al, 2009;Tu et al, 2004). Researchers also demonstrated that P. vitatta was more efficient in taking up As(III) than As(V) (Mathews et al, 2010;Wang et al, 2010). Thus, it is possible that phosphate supplied in solution decreased roots uptake of As(V) in the absence of phenanthrene compared to the co-exposure treatment.…”

“…It is generally recognized that the chemical form of supplied arsenic is a determinant factor for plant uptake behavior. The research of Mathews et al (2010) demonstrated that supplied As(III) in solution would result in roots As(III) concentration elevation. Based on the current study, it should be noted that more than 75% As(V) reduced to As(III) in growth media with plant co-exposed to phenanthrene, which would be one possible explanation for the increased As(III) content in roots.…”

“…However, the determined values of pH and Eh under the co-exposure with plant was in accordance with the condition of As(V) dominates according to Smedley and Kinniburgh (2009), which could not be the reason either. Some authors recognized that rhizosphere microorganisms play an important role in arsenic transformation in the growth media (Mathews et al, 2010). Muratova et al (2009) investigated the effect of phenanthrene on roots exudation of Sorghum bicolor (L.) Moench and found that roots exudates of carboxylic acids decreased and the phenanthrene-degrading microorganisms increased.…”

Characterization of As efflux from the roots of As hyperaccumulator Pteris vittata L.

“…As(V) is the predominant species in the roots of P. vittata, with As(III) accounting for 10-40% of the total As Poynton et al 2004;Pickering et al 2006), However, most reports did not separate the roots and the rhizomes. Recently, Mathews et al (2010) have reported that As(V) reduction occurs mainly in the rhizomes where As(III) accounts for 68-71%, and is limited in roots where it accounts for 7-8%. In contrast, As(III) is the dominant As species in the fronds (70-90% of the total As) (Lombi et al 2002;Webb et al 2003) and the xylem sap (93-98% of the total As) (Su et al 2008) of P. vittata.…”

First evidence on different transportation modes of arsenic and phosphorus in arsenic hyperaccumulator Pteris vittata

“…Although Mathews et al (2010) suggested that, before entering into plants, As(III) may be oxidized into As(V) by microorganisms around P. vittata's rhizoids, the available references do not fully explain the role of a P transporter in the transport of As(V) and As(III). It is only in non-hyperaccumulating plants, such as Holcus lanatus L. and Lemna gibba, that As has been confirmed to be taken up via a P translocation system (Meharg and Macnair, 1992;Ullrich-Eberius et al, 1989).…”