Abstract
The iron (Fe) efficient maize cultivar WF9 and the Fe inefficient maize mutant ys1 were grown in nutrient solutions with varied Fe supply. Changes in pH, reducing capacity of the roots and the release of Fe(III) reducing compounds were monitored over a period of 11 days. In both cultivars under Fe deficiency, there was no increased release of protons or reducing compounds and no increased reducing capacity of the roots. Indeed, the Fe(III) reduction of the roots of both cultivars tended to be higher in Fe sufficient plants. In contrast to some recent reports, these results demonstrate that the Fe efficient maize cultivar WF9 does not respond to Fe deficiency by strategy I mechanisms. This suggests that differences in Fe efficiency between the two cultivars are probably due to use of strategy II mechanisms for Fe acquisition.
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von Wirén, N., Römheld, V. & Marschner, H. Evaluation of strategy I mechanisms in iron efficient and inefficient maize cultivars. Plant Soil 155, 445–448 (1993). https://doi.org/10.1007/BF00025079
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DOI: https://doi.org/10.1007/BF00025079