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|Title:||Root uptake of lipophilic zinc-rhamnolipid complexes|
|Citation:||Journal of Agricultural and Food Chemistry, 2008; 56(6):2112-2117|
|Publisher:||Amer Chemical Soc|
|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.|
|Appears in Collections:||Earth and Environmental Sciences publications|
Environment Institute publications
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