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- W2039160265 abstract "High concentrations of Fe in the roots of plants grown in calcareous soil have been found in a variety of plants, which, nevertheless, show Fe deficiency symptoms. In the present work, energy dispersive X-ray (EDX) analysis at the cellular level has been used to characterize high root Fe concentrations in maize (Zea mays L.) grown in a calcareous soil in comparison with low root Fe concentrations under acidic soil conditions. Roots were thoroughly washed to remove adhering soil particles from the root surface as far as possible. To avoid any interference with possibly still present soil particles, the excitation beam was focused on radial walls of neighboring cells as well as on the symplast. Under alkaline conditions, high Fe concentrations in the mM range and higher accumulated in the epidermal root apoplast. Symplastic Fe was not detectable. Only traces of Fe were detectable in the apoplast of the cortex parenchyma. Under acidic conditions, apoplastic root Fe concentrations were clearly lower than under alkaline conditions, and no Fe was detectable in the root apoplast by use of EDX analysis. We conclude that, under alkaline conditions, high amounts of Fe are trapped in the epidermal root apoplast (apoplastic Fe inactivation), probably because of a high apoplastic pH and thus restricted translocation towards the root stele and to the upper plant parts. In contrast, on acidic soils Fe translocation towards the root stele and thus Fe supply to the upper plant parts was not impaired. Our findings imply that Fe deficiency on calcareous soils is not caused by restricted acquisition of Fe from the soil." @default.
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- W2039160265 date "2001-12-01" @default.
- W2039160265 modified "2023-09-24" @default.
- W2039160265 title "Apoplastic accumulation of iron in the epidermis of maize (<i>Zea mays</i> ) roots grown in calcareous soil" @default.
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- W2039160265 doi "https://doi.org/10.1034/j.1399-3054.2001.1130410.x" @default.
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