Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/47336
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Type: Journal article
Title: Root uptake of lipophilic zinc-rhamnolipid complexes
Author: Stacey, S.
McLaughlin, M.
Cakmak, I.
Hettiarachchi, G.
Scheckel, K.
Karkkainen, M.
Citation: Journal of Agricultural and Food Chemistry, 2008; 56(6):2112-2117
Publisher: Amer Chemical Soc
Issue Date: 2008
ISSN: 0021-8561
1520-5118
Statement of
Responsibility: 
Samuel P. Stacey, Michael J. McLaughlin, Ismail Çakmak, Ganga M. Hettiarachchi, Kirk G. Scheckel and Michael Karkkainen
Abstract: This study investigated the formation and plant uptake of lipophilic metal−rhamnolipid complexes. Monorhamnosyl and dirhamnosyl rhamnolipids formed lipophilic complexes with copper (Cu), manganese (Mn), and zinc (Zn). Rhamnolipids significantly increased Zn absorption by Brassica napus var. Pinnacle roots in ⁶⁵Zn-spiked ice-cold solutions, compared with ZnSO₄ alone. Therefore, rhamnolipid appeared to facilitate Zn absorption via a nonmetabolically mediated pathway. Synchrotron XRF and XAS showed that Zn was present in roots as Zn−phytate-like compounds when roots were treated with Zn-free solutions, ZnSO₄, or Zn−EDTA. With rhamnolipid application, Zn was predominantly found in roots as the Zn−rhamnolipid complex. When applied to a calcareous soil, rhamnolipids increased dry matter production and Zn concentrations in durum (Triticum durum L. cv. Balcali-2000) and bread wheat (Triticum aestivum L. cv. BDME-10) shoots. Rhamnolipids either increased total plant uptake of Zn from the soil or increased Zn translocation by reducing the prevalence of insoluble Zn−phytate-like compounds in roots.
Keywords: chelate; fertilizer; lipophilic; rhamnolipid; zinc
Description: Copyright © 2008 American Chemical Society
Provenance: Published on Web 02/28/2008.
RMID: 0020080406
DOI: 10.1021/jf0729311
Published version: http://pubs.acs.org/cgi-bin/abstract.cgi/jafcau/2008/56/i06/abs/jf0729311.html
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

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