Abstract
This work aims to investigate the nature and the specific mechanisms by which polycarboxylic compounds participate in the tolerance of Silene vulgaris to Cr with special attention given to the rhizosphere system. This knowledge is important to use this species in the implementation of phytoremediation technologies in Cr-polluted soils. According to the results, chromium is chelated and mobilized by the citric and malic acids in plant tissues, while oxalic acid might participate in the reduction and chelation of Cr in the rhizosphere. At the applied doses, the response of both exudation rate and root exudate composition (total polyphenols and quercitin) seems to involve a rearrangement in the lignification of the plant cell wall to immobilize Cr. Quercetin-3-dirhamnosyl-galactoside and apiin (apigenin-7-O-apiosyl-glucoside) have been identified as the major polyphenols in the root exudates of S. vulgaris. The increments found in the apiin concentration in root exudates seem to be related to the protection against Cr toxicity by chelation of Cr or by free radical scavenging. Though earlier response is detected in plant tissues, results from this work together with previous studies in S. vulgaris indicate that exudation might be a regulated mechanism of protection under Cr exposition in S. vulgaris that may involve mainly Cr reduction and chelation.
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Acknowledgements
We are grateful to the Analysis Service Unit facilities of ICTAN for the analysis of chromatography and mass spectrometry. The authors thank the financial supports provided by EIADES (S2009/AMB-1478, Comunidad de Madrid), RTA-000150-00-00-INIA and “Contratación de doctores 2007 INIA-CCAA” and MINECO AGL2012-30803. We thank “Instituto Madrileño de Investigación y Desarrollo Rural, Agrario y Alimentario” for the fellowship support of Ana E. Pradas.
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Pradas del Real, A.E., Silvan, J.M., de Pascual-Teresa, S. et al. Role of the polycarboxylic compounds in the response of Silene vulgaris to chromium. Environ Sci Pollut Res 24, 5746–5756 (2017). https://doi.org/10.1007/s11356-016-8218-4
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DOI: https://doi.org/10.1007/s11356-016-8218-4