Root Uptake of Lipophilic Zinc−Rhamnolipid Complexes

Journal Article · Tue Jun 16 04:00:00 EDT 2009 · J. Agric. Food Chem.

DOI:https://doi.org/10.1021/jf0729311· OSTI ID:1007102

Stacey, Samuel P; McLaughlin, Michael J; Cakmak, Ismail; Hettiarachchi, Ganga M; Scheckel, Kirk G; Karkkainen, Michael ^[1]

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1. Sabanci

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 {sup 65}Zn-spiked ice-cold solutions, compared with ZnSO{sub 4} 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, ZnSO{sub 4}, 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.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: USDOE
• OSTI ID: 1007102
• Journal Information: J. Agric. Food Chem., Journal Name: J. Agric. Food Chem. Journal Issue: (6) ; 03, 2008 Vol. 56; ISSN 0021-8561; ISSN JAFCAU
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
ABSORPTION
BRASSICA
BREAD
COPPER
MANGANESE
PRODUCTION
SOILS
SYNCHROTRONS
TRANSLOCATION
WHEAT
ZINC