Abstract
Maize plants follow Strategy II to take up Fe from the rhizosphere. In roots, nicotianamine is used as precursor for the production of deoxymugineic acid (DMA). DMA is secreted to the rhizosphere where it chelates Fe(III) and the Fe(III)-DMA complex is then taken up by the root. In this study, non-mycorrhizal and mycorrhizal maize plants were grown in pots with sterile river sand containing FePO4. After a 60-day period of sulfur deficiency, sulfur was provided to the plants in the form of sulfate. The expression profiles of ZmNAS1, ZmDMAS1, ZmTOM1 and ZmYS1, key genes of the Fe uptake pathway in maize, were monitored 24 and 48 h after sulfate addition in both mycorrhizal and non-mycorrhizal roots in order to estimate the impact of sulfate availability on the Fe uptake pathway of two distinct plant systems. Significant differential responses have been recorded between mycorrhizal and non-mycorrhizal plants, both before as well as 48 h after sulfate addition. However, sulfur repletion resulted in a significant downregulation of all studied genes in all plants 24 h after sulfate addition. This finding suggests a strong correlation between the transcriptional regulation of the Fe uptake pathway genes and sulfate availability no matter if the plants are in mycorrhizal association or not. Sulfate is probably a key component of the signal transduction pathway that regulates the expression of the Fe uptake pathway genes in maize plants.
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Saridis, G.I., Chorianopoulou, S.N., Katinakis, P., Bouranis, D.L. (2017). Evidence for Regulation of the Iron Uptake Pathway by Sulfate Supply in S-Deprived Maize Plants. In: De Kok, L., Hawkesford, M., Haneklaus, S., Schnug, E. (eds) Sulfur Metabolism in Higher Plants - Fundamental, Environmental and Agricultural Aspects. Proceedings of the International Plant Sulfur Workshop. Springer, Cham. https://doi.org/10.1007/978-3-319-56526-2_17
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DOI: https://doi.org/10.1007/978-3-319-56526-2_17
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