Abstract
Aims
The present study was undertaken to investigate the mechanism underlying NaCl-alleviated Fe (iron) deficiency in Arabidopsis thaliana Col-0 (Columbia ecotype).
Methods
Six-week-old Col-0 with rosettes of similar diameters was grown in full-strength nutrient solution lacking Fe (Fe-deficient) or full-strength nutrient solution (Fe-sufficient) with or without 10 mM NaCl for 7 days. Roots were then harvested for analysis of total Fe content, soluble Fe concentration, and abscisic acid (ABA) content as well as for cell wall and RNA extraction, while shoots were harvested for total Fe content and soluble Fe concentration measurements.
Results
The total Fe content and the soluble Fe concentration were higher in roots and shoots of −Fe + NaCl-treated plants than −Fe-treated plants, whereas Fe retention in the cell wall was reduced, suggesting the presence of a cell wall Fe-reutilization mechanism. This conclusion was confirmed by the observation that less hemicelluloses Fe was found in plants under −Fe + NaCl treatment. In addition, associated to the upregulation of genes related to the long-distance transport of Fe, such as FRD3 (FERRIC REDUCTASE DEFECTIVE3), YSL2 (YELLOW STRIPE-LIKE), and NAS1 (NICOTIANAMINE SYNTHASE1) under −Fe + NaCl treatment, more Fe was available in shoots. Furthermore, endogenous ABA is involved in NaCl-alleviated Fe deficiency, as the addition of Flu (fluridone), an inhibitor of ABA biosynthesis, abolished the positive effect of NaCl on Fe deficiency.
Conclusions
Under −Fe condition, NaCl not only is involved in the reutilization of cell wall Fe but also participates in the translocation of Fe from root to shoot in Arabidopsis, partially through its effect on ABA contents.
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Acknowledgements
This work was funded by the National Key Basic Research Program of China (No. 2014CB441000) and “Strategic Priority Research Program” of the Chinese Academy of Sciences (Nos. XDB15030302 and XDB15030202). We thank three anonymous reviewers for their valuable comments to improve the quality of our work.
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Zhu, X.F., Wu, Q., Zheng, L. et al. NaCl alleviates iron deficiency through facilitating root cell wall iron reutilization and its translocation to the shoot in Arabidopsis thaliana . Plant Soil 417, 155–167 (2017). https://doi.org/10.1007/s11104-017-3248-3
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DOI: https://doi.org/10.1007/s11104-017-3248-3