Plant and Soil

, 325:25

Micro-analytical, physiological and molecular aspects of Fe acquisition in leaves of Fe-deficient tomato plants re-supplied with natural Fe-complexes in nutrient solution

Authors

  • Nicola Tomasi
    • Dipartimento di Scienze Agrarie e AmbientaliUniversity of Udine
  • Cecilia Rizzardo
    • Dipartimento di Scienze Agrarie e AmbientaliUniversity of Udine
  • Rossella Monte
    • Dipartimento di Scienze Agrarie e AmbientaliUniversity of Udine
  • Stefano Gottardi
    • Dipartimento di Scienze Agrarie e AmbientaliUniversity of Udine
  • Nahida Jelali
    • Dipartimento di Scienze Agrarie e AmbientaliUniversity of Udine
    • CBT de Borj-Cedria
  • Roberto Terzano
    • Dipartimento di Biologia e Chimica Agro-forestale e AmbientaleUniversity of Bari
  • Bart Vekemans
    • Department of Analytical ChemistryGhent University
  • Maria De Nobili
    • Dipartimento di Scienze Agrarie e AmbientaliUniversity of Udine
  • Zeno Varanini
    • Dipartimento di Scienze, Tecnologie e Mercati della Vite e del VinoUniversity of Verona
  • Roberto Pinton
    • Dipartimento di Scienze Agrarie e AmbientaliUniversity of Udine
    • Dipartimento di Scienze Agrarie e AmbientaliUniversity of Udine
Regular Article

DOI: 10.1007/s11104-009-0069-z

Cite this article as:
Tomasi, N., Rizzardo, C., Monte, R. et al. Plant Soil (2009) 325: 25. doi:10.1007/s11104-009-0069-z

Abstract

It is well known that in the rhizosphere soluble Fe sources available for plants are mainly a mixture of complexes between the micronutrient and organic ligands such as organic acids and phytosiderophores (PS) released by roots, microbial siderophores as well as fractions of humified organic matter. In the present work, mechanisms of Fe acquisition operating at the leaf level of plants fed with different Fe-complexes were investigated at the micro-analytical, physiological and molecular levels. Fe-deficient tomato plants (Solanum Lycopersicum L., cv. ‘Marmande’) were fed for 24 h with a solution (pH 7.5) containing 1 µM Fe as Fe-PS, Fe-citrate or Fe-WEHS. Thereafter, leaf tissue was used for the visualization of Fe distribution, measurements of Fe content, reduction and uptake, and evaluation of expression of Fe-chelate reductase (LeFRO1), Fe-transporter (LeIRT1) and Ferritin (Ferritin2) genes. Leaf discs isolated from Fe-deficient plants treated for 24 h with Fe-WEHS developed higher rates of translocation, Fe-chelate reduction and 59Fe uptake as compared to plants supplied with Fe-citrate or Fe-PS. Leaves of plants treated with Fe-WEHS also showed higher transcript levels of LeFRO1, LeIRT1 and Ferritin2 genes with respect to plants fed with the other Fe-sources. Data obtained support the idea that the efficient use of Fe complexed to WEHS-like humic fractions involves, at least in part, also the activation of Fe-acquisition mechanisms operating at the leaf level.

Keywords

Iron chlorosisNatural Fe-sourcesSolanum lycopersicum L.Humic substances59FeSynchrotron µ-XRF analyses

Abbreviations

PS

Phytosiderophores

WEHS

Water-extractable humic fraction

µ-XRF

Micro x-ray fluorescence

Copyright information

© Springer Science+Business Media B.V. 2009