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Root Uptake Of Lipophilic Zinc-Rhamnolipid Complexes
Citation:
Stacey, S. P., M. J. McLaughlin, I. Cakmak, G. M. HETTIARACHCHI, K. G. SCHECKEL, AND M. Karkkainen. Root Uptake Of Lipophilic Zinc-Rhamnolipid Complexes. J. N. Seiber (ed.), JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY. American Chemical Society, Washington, DC, 56(6):2112-2117, (2008).
Impact/Purpose:
To investigate the absorption of zinc-rhamnolipid by canola roots in solution culture, the effect of rhamnolipid on Zn speciation and distribution in these roots using synchrotron-based spectroscopies, and the response of bread and durum wheats to rhamnolipid application on a calcareous soil from central Anatolia in Turkey
Description:
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.
