Abstract
Cadmium uptake, tissue localization and structural changes induced at cellular level are essential to understand Cd tolerance in plants. In this study we have exposed plants of Pteris vittata to different concentrations of CdCl2 (0, 30, 60, 100 μM) to evaluate the tolerance of the fern to cadmium. Cadmium content determination and its histochemical localization showed that P. vittata not only takes up, but also transports and accumulates cadmium in the aboveground tissues, delocalizing it mainly in the less bioactive tissues of the frond, the trichomes and the scales. Cadmium tolerance in P. vittata was strictly related to morphogenic response induced by the metal itself in the root system. Adaptive response regarded changes of the root apex size, the developmental pattern of root hairs, the differentiation of xylem elements and endodermal suberin lamellae. All the considered parameters suggest that, in our experimental conditions, 60 μM of Cd may represent the highest concentration that P. vittata can tolerate; indeed this Cd level even improves the absorbance features of the root and allows good transport and accumulation of the metal in the fronds. The results of this study can provide useful information for phytoremediation strategies of soils contaminated by Cd, exploiting the established ability of P. vittata to transport, delocalize in the aboveground biomass and accumulate polluting metals.
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This work was supported by local funding of the University of Pisa (ex 60 %) and by the grants of Slovak Research and Development Agency (contract APVV-0140-10) and the COST Action FA-0905.
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Balestri, M., Ceccarini, A., Forino, L.M.C. et al. Cadmium uptake, localization and stress-induced morphogenic response in the fern Pteris vittata . Planta 239, 1055–1064 (2014). https://doi.org/10.1007/s00425-014-2036-z
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DOI: https://doi.org/10.1007/s00425-014-2036-z