Understanding the fate and behavior of iron from foliar-applied Fe nanoparticulate fertilizers in tomato and durum wheat - insights from X-ray absorption spectroscopy combined with Fe isotopic measurements. - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Understanding the fate and behavior of iron from foliar-applied Fe nanoparticulate fertilizers in tomato and durum wheat - insights from X-ray absorption spectroscopy combined with Fe isotopic measurements.

Résumé

To reduce conventional fertilizer environmental inputs, foliar-applied nanoparticulate (NP) fertilizers are being developed. In addition to being more efficient, they will help avoid overapplication and minimize contamination of agricultural soils. However, it remains unclear how foliar-applied NP fertilizers are assimilated into the leaves, and how the nutrients they deliver are used by the crops. Here, we used three different Fe-based NP fertilizers (Fe2O3-NP and two Fe3O4-NPs) to deliver Fe, a crucial nutrient that is often depleted in agricultural soils, and for which plants have developed two acquisition strategies. Our goal was to follow the fate of foliar-applied Fe from FeNPs in two edible plants (Solanum lycopersicum – tomato, type I, Fe redox-based and Triticum turgidum – durum wheat, type II, Fe3+ complexation-based) using a multi-technique approach. By combining Fe K-edge XANES measurements with Fe isotopic measurements, we aimed at tracing the pathways and mechanisms that affect Fe from foliar-applied FeNP fertilizers in our plants. Tomato and durum wheat plants were grown under hydroponic conditions under controlled parameters (e.g. temperature, photoperiod, humidity) and plants were harvested 14 days after foliar application of the FeNP fertilizers or foliar application of a pure water spray for control plants. Stems and roots of tomato specimens, as well as leaves, seeds and roots of durum wheat were processed and analyzed for Fe speciation by High Energy Resolution Fluorescence Detected X-Ray absorption spectroscopy at the ESRF synchrotron facility. Results show a major role of carboxylic acids (e.g. Fe(III) citrate) and proteins (such as Fe(III) ferritin) as the main ligands of Fe in all parts of the control plants, for both tomato and wheat. Fe NPs remained on/in the exposed leaves of durum wheat, accounting for ~50% of the foliar Fe. Our results showed very limited translocation of Fe NPs from the leaves to the roots in wheat. In the tomatoes, only ~20% of the Fe is found as Fe NP on/in the leaves, and results show no evidence of Fe in nanoparticulate form in the roots. The samples will be processed for Fe stable isotope measurements to further constrain the fate of Fe in these plants.
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Dates et versions

hal-04293812 , version 1 (19-11-2023)

Identifiants

  • HAL Id : hal-04293812 , version 1

Citer

Marie-Laure Pons, Danielle L Slomberg, Zuzana Fekiacova, Abel Guihou, Perrine Chaurand, et al.. Understanding the fate and behavior of iron from foliar-applied Fe nanoparticulate fertilizers in tomato and durum wheat - insights from X-ray absorption spectroscopy combined with Fe isotopic measurements.. Goldschmidt 2023, Jul 2023, Lyon, France. ⟨hal-04293812⟩
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