Selenium tolerance, accumulation, localization and speciation in a Cardamine hyperaccumulator and a non-hyperaccumulator
| Autor: | Zsuzsa Jókai, Elizabeth A. H. Pilon-Smits, Bernadette Aguirre, Ami L. Wangeline, Leonardo Warzea Lima, Hongqing Yin, Sirine C. Fakra, Eszter Borbála Both, Gavin C. Stonehouse, Áron Soós, Jiqian Xiang, Mihaly Dernovics |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
inorganic chemicals
Environmental Engineering 010504 meteorology & atmospheric sciences media_common.quotation_subject chemistry.chemical_element 010501 environmental sciences 01 natural sciences Selenate Article Selenium chemistry.chemical_compound Botany Soil Pollutants Environmental Chemistry Hyperaccumulator Waste Management and Disposal Chlorophyll fluorescence 0105 earth and related environmental sciences media_common biology Chemistry Selenolanthionine food and beverages Brassicaceae biology.organism_classification Pollution Sulfur Speciation Hyperaccumulation Cardamine X-ray microprobe analysis Environmental Sciences |
| Zdroj: | The Science of the total environment |
| ISSN: | 0048-9697 |
| DOI: | 10.1016/j.scitotenv.2019.135041 |
| Popis: | Cardamine violifolia (family Brassicaceae) is the first discovered selenium hyperaccumulator from the genus Cardamine with unique properties in terms of selenium accumulation, i.e., high abundance of selenolanthionine. In our study, a fully comprehensive experiment was conducted with the comparison of a non-hyperaccumulator Cardamine species, Cardamine pratensis, covering growth characteristics, chlorophyll fluorescence, spatial selenium/sulfur distribution patterns through elemental analyses (synchrotron-based X-Ray Fluorescence and ICP-OES) and speciation data through selenium K-edge micro X-ray absorption near-edge structure analysis (μXANES) and strong cation exchange (SCX)-ICP-MS. The results revealed remarkable differences in contrast to other selenium hyperaccumulators as neither Cardamine species showed evidence of growth stimulation by selenium. Also, selenite uptake was not inhibited by phosphate for either of the Cardamine species. Sulfate inhibited selenate uptake, but the two Cardamine species did not show any difference in this respect. However, μXRF derived speciation maps and selenium/sulfur uptake characteristics provided results that are similar to other formerly reported hyperaccumulator and non-hyperaccumulator Brassicaceae species. μXANES showed organic selenium, “C-Se-C”, in seedlings of both species and also in mature C. violifolia plants. In contrast, selenate-supplied mature C. pratensis contained approximately half “C-Se-C” and half selenate. SCX-ICP-MS data showed evidence of the lack of selenocystine in any of the Cardamine plant extracts. Thus, C. violifolia shows clear selenium-related physiological and biochemical differences compared to C. pratensis and other selenium hyperaccumulators. GRAPHICAL ABSTRACT |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect