Root uptake of lipophilic zinc-rhamnolipid complexes
Stacey, Samuel P. and McLaughlin, Michael J. and Çakmak, İsmail and Hettiarachchi, Ganga M. and Scheckel, Kirk G. and Karkkainen, Michael (2008) Root uptake of lipophilic zinc-rhamnolipid complexes. Journal of Agricultural and Food Chemistry, 56 (6). pp. 2112-2117. ISSN 0021-8561 (Print) 1520-5118 (Online)
Official URL: http://dx.doi.org/10.1021/jf0729311
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.
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