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Role of Humic Substances in the Rhizosphere

Pinton, R., Cesco, S., Schmidt W., and Varanini, Z. (2006). Role of humic substances as rhizospheric signals affecting root growth and mechanisms of nutrient acquisition. In Proceedings, 13th Meeting of the International Humic Substances Society, Karlsruhe, vol. 45-1, pp. 45 18. [Pg.363]

Analysis of the Pb EXAFS data from the Fe-plaque revealed a Pb-0 interatomic distance of 2.4 A, which is inconsistent with published data for Pb sorbed to Fe-oxides (-2.27 A). Furthermore, optimized fitting of the second shell EXAFS function was obtained for C or N at a distance of 3.4 A, which is longer than previous reports for Pb bound humic material (Hansel et al. 2001). Based on fits that included a sample where Pb was bound to microbial biofilm it was concluded that the Pb was bound to a microbial biofilm-like material apparently intimately associated with the Fe-plaque. This finding demonstrates the important role of microorganisms in rhizosphere processes and the preferential binding of Pb to extracellular polymeric substances even in the presence of a highly reactive high surface area Fe-oxide phase. [Pg.457]

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In rhizosphere

Rhizosphere

Rhizosphere, humic substances

Rhizospheres

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