Montag, 29. April 2013, 16:30 - 18:00 iCal

Physico-chemical properties and physiological functions of root exudates in iron acquisition by plant roots

Aktuelle Themen in den Umweltgeowissenschaften II

Fakultät für Geowissenschaften, Geographie und Astronomie, Eberhard Clar-Saal (2B 204)
Althanstrasse 14, UZA II, 1090 Wien

Seminar, Workshop, Kurs

Under iron deficiency graminaceous plants acquire Fe(III) from the soil by increasing the release of phytosiderophores (PS) and the subsequent uptake of Fe(III)-PS complexes via YS1-type transporters. Certain graminaceous species hydroxylate the PS backbone, which enhances the intramolecular chelate stability with Fe(III). This study investigated the impact of PS hydroxylation on iron acquisition by comparing Fe mobilization and chelation properties among the non-hydroxylated PS deoxy-mugineic acid (DMA), the single-hydroxylated PS mugineic acid (MA) and the double-hydroxylated PS epi-hydroxy-mugineic acid (epiHMA) employing nano-electrospray Fourier transform ion cyclotron resonance mass spectrometry (nano-ESI-FTICRMS).

In contrast to grasses, non-graminaceous plant species acquire iron by a reduction-based strategy, in which iron-deficient plant roots release protons into the rhizosphere to facilitate the reduction of iron(III)-chelates and subsequent uptake of ferrous Fe. A role of root exudates in this strategy has so far been little investigated. Our work provides evidence for secondary metabolites from the phenylpropanoid pathway in iron mobilization in the rhizosphere.


Prof. Nicolaus von Wirén, The Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Germany


Vesna Micic Batka
Department of Environmental Geosciences
Environmental Geosciences Group