Pteris vittata – Revisited: Uptake of As and its speciation, impact of P, role of phytochelatins and S |
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Authors: | Doris Vetterlein Dirk Wesenberg Petra Nathan Anja Brutigam Angelika Schierhorn Jürgen Mattusch Reinhold Jahn |
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Institution: | Doris Vetterlein, Dirk Wesenberg, Petra Nathan, Anja Bräutigam, Angelika Schierhorn, Jürgen Mattusch,Reinhold Jahn |
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Abstract: | Pteris vittata is known to hyperaccumulate As but the mechanism is poorly understood. We found an increase of As concentration with increasing soil solution As concentrations, but P application had no impact, although plant P concentrations responded to different rates of P supply. As in fronds was dominantly (82–89%) present in the form of AsIII. In roots we detected 45% as AsIII which is higher than reported in previous studies and supports substantial As-reduction to take place in roots. We detected PC2/3GS–AsIII, PC2–GS–AsIII and (PC2)2–AsIII in increasing amounts with application of As. The total amount of PC was in the range reported previously and far too small to assign a significant role in As detoxification to PCs. The close correlation between S and As in fronds and the lack of data on sulphur uptake and metabolism indicates the need for a detailed investigation on sulphur nutritional status and As metabolism in P. vittata. |
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Keywords: | Arsenic detoxification Arsenic speciation Hyperaccumulator PC– As complexes P uptake Sulphur metabolism |
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