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Aseptic hydroponics to assess rhamnolipid-Cd and rhamnolipid-Zn bioavailability for sunflower (Helianthus annuus): a phytoextraction mechanism study.
Environ Sci Pollut Res Int. 2016 Nov; 23(21):21327-21335.ES

Abstract

The availability of cadmium (Cd) and zinc (Zn) to sunflower (Helianthus annuus) was investigated in rhamnolipid- and ethylenediaminetetraacetic acid (EDTA)-buffered solutions in order to evaluate the influence of aqueous speciation of the metals on their uptake by the plant, in relation to predictions of uptake by the free ion activity model (FIAM). Free metal ion activity was estimated using the chemical equilibrium program MINTEQ or measured by Donnan dialysis. The uptake of Cd followed the FIAM for the EDTA-buffered solution at EDTA concentrations below 0.4 μM; for the rhamnolipid-buffered solution, the uptake of both metals in roots was not markedly affected by increasing rhamnolipid concentrations in solution. This suggests rhamnolipid enhanced metal accumulation in plant roots (per unit free metal in solution) possibly through formation and uptake of lipophilic complexes. The addition of normal Ca concentrations (low millimetre range) to the rhamnolipid uptake solutions reduced Cd accumulation in shoots by inhibiting Cd translocation, whereas it significantly increased Zn accumulation in shoots. This study confirms that although rhamnolipid could enhance accumulation of Cd in plants roots at low Ca supply, it is not suitable for Cd phytoextraction in contaminated soil environments where Ca concentrations in soil solution are orders of magnitude greater than those of Cd.

Authors+Show Affiliations

Wen J
Soil Science, School of Agriculture, Food and Wine, The University of Adelaide, PMB 1, Glen Osmond, SA, 5064, Australia. jwen@hnu.edu.cn. College of Environmental Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China. jwen@hnu.edu.cn.
McLaughlin MJ
Soil Science, School of Agriculture, Food and Wine, The University of Adelaide, PMB 1, Glen Osmond, SA, 5064, Australia. CSIRO Land and Water, Agricultural Sustainable Flagship, Environmental Biogeochemistry Program, Waite Campus, Urrbrae, SA, 5064, Australia.
Stacey SP
Soil Science, School of Agriculture, Food and Wine, The University of Adelaide, PMB 1, Glen Osmond, SA, 5064, Australia. Everris Australia Pty Ltd, Baulkham Hills, Bella Vista, NSW, Australia.
Kirby JK
CSIRO Land and Water, Agricultural Sustainable Flagship, Environmental Biogeochemistry Program, Waite Campus, Urrbrae, SA, 5064, Australia.

MeSH

Biodegradation, EnvironmentalBiological AvailabilityCadmiumEdetic AcidGlycolipidsHelianthusHydroponicsPlant RootsSoilSoil PollutantsZinc

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27502457

Citation

Wen, Jia, et al. "Aseptic Hydroponics to Assess rhamnolipid-Cd and rhamnolipid-Zn Bioavailability for Sunflower (Helianthus Annuus): a Phytoextraction Mechanism Study." Environmental Science and Pollution Research International, vol. 23, no. 21, 2016, pp. 21327-21335.
Wen J, McLaughlin MJ, Stacey SP, et al. Aseptic hydroponics to assess rhamnolipid-Cd and rhamnolipid-Zn bioavailability for sunflower (Helianthus annuus): a phytoextraction mechanism study. Environ Sci Pollut Res Int. 2016;23(21):21327-21335.
Wen, J., McLaughlin, M. J., Stacey, S. P., & Kirby, J. K. (2016). Aseptic hydroponics to assess rhamnolipid-Cd and rhamnolipid-Zn bioavailability for sunflower (Helianthus annuus): a phytoextraction mechanism study. Environmental Science and Pollution Research International, 23(21), 21327-21335.
Wen J, et al. Aseptic Hydroponics to Assess rhamnolipid-Cd and rhamnolipid-Zn Bioavailability for Sunflower (Helianthus Annuus): a Phytoextraction Mechanism Study. Environ Sci Pollut Res Int. 2016;23(21):21327-21335. PubMed PMID: 27502457.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Aseptic hydroponics to assess rhamnolipid-Cd and rhamnolipid-Zn bioavailability for sunflower (Helianthus annuus): a phytoextraction mechanism study. AU - Wen,Jia, AU - McLaughlin,Mike J, AU - Stacey,Samuel P, AU - Kirby,Jason K, Y1 - 2016/08/09/ PY - 2016/03/15/received PY - 2016/08/01/accepted PY - 2016/8/10/pubmed PY - 2017/4/4/medline PY - 2016/8/10/entrez KW - Free ion activity model KW - Metals KW - Phytoremediation KW - Rhamnolipid SP - 21327 EP - 21335 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 23 IS - 21 N2 - The availability of cadmium (Cd) and zinc (Zn) to sunflower (Helianthus annuus) was investigated in rhamnolipid- and ethylenediaminetetraacetic acid (EDTA)-buffered solutions in order to evaluate the influence of aqueous speciation of the metals on their uptake by the plant, in relation to predictions of uptake by the free ion activity model (FIAM). Free metal ion activity was estimated using the chemical equilibrium program MINTEQ or measured by Donnan dialysis. The uptake of Cd followed the FIAM for the EDTA-buffered solution at EDTA concentrations below 0.4 μM; for the rhamnolipid-buffered solution, the uptake of both metals in roots was not markedly affected by increasing rhamnolipid concentrations in solution. This suggests rhamnolipid enhanced metal accumulation in plant roots (per unit free metal in solution) possibly through formation and uptake of lipophilic complexes. The addition of normal Ca concentrations (low millimetre range) to the rhamnolipid uptake solutions reduced Cd accumulation in shoots by inhibiting Cd translocation, whereas it significantly increased Zn accumulation in shoots. This study confirms that although rhamnolipid could enhance accumulation of Cd in plants roots at low Ca supply, it is not suitable for Cd phytoextraction in contaminated soil environments where Ca concentrations in soil solution are orders of magnitude greater than those of Cd. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/27502457/Aseptic_hydroponics_to_assess_rhamnolipid_Cd_and_rhamnolipid_Zn_bioavailability_for_sunflower__Helianthus_annuus_:_a_phytoextraction_mechanism_study_ DB - PRIME DP - Unbound Medicine ER -