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Title (Primary) Uptake of α-HCH by wheat from the gas phase and translocation to soil analyzed by a stable carbon isotope labeling experiment
Author Liu, X.; Bonhomme, J.; Merbach, I.; Kümmel, S.; Richnow, H.H.
Journal Chemosphere
Year 2021
Department ISOBIO; BZF
Volume 264
Issue Part 2
Page From art. 128489
Language englisch
Topic T7 Bioeconomy
T5 Future Landscapes
Keywords Hexachlorocyclohexane isomers; Carbon isotope composition; Uptake; Translocation
Abstract Hexachlorocyclohexane isomers (HCH) are persistent organic pollutants which cause serious environmental pollution. Phytoextraction is one of the strategies of phytoremediation, which was considered as a promising method for the clean-up of HCH contaminated field sites. To understand the uptake and translocation mechanisms of HCH in soil-plant system, the uptake of HCH from the gas phase was investigated in a tracer experiment with 13C-labeled α-HCH. The results provide new insights on the uptake mechanism of HCH and allow the elucidation of transport pathways of POPs from the leaves to the rhizosphere. A higher dissipation of α-HCH in planted set-ups versus unplanted controls indicated next to intensive biodegradation in the rhizosphere the removal of HCH by root uptake, accumulation and possible transformation within plants. Analyzing the carbon isotopic composition (δ13C) of α-HCH in the soil of unplanted controls revealed a change of 15.8–28.6‰ compared to the initial δ13C value, indicating that a soil gas phase transportation of α-HCH occurred. Additionally, higher δ13C values of α-HCH were observed in bulk and rhizosphere soil in non-labeled treatments compared to unplanted controls, revealing the uptake of α-HCH from the gas phase by the leaves and the further translocation to the roots and finally release to the rhizosphere. This uptake by the leaves and the subsequent translocation of α-HCH within the plant is further indicated by the observed variations of the δ13C value of α-HCH in different plant tissues at different growth stages. The uptake and translocation pathways of α-HCH from the gas phase need to be considered in phytoremediation.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=23780
Liu, X., Bonhomme, J., Merbach, I., Kümmel, S., Richnow, H.H. (2021):
Uptake of α-HCH by wheat from the gas phase and translocation to soil analyzed by a stable carbon isotope labeling experiment
Chemosphere 264 (Part 2), art. 128489