Abstract
It has been shown previously (Treeby et al., 1989) that phytosiderophores, released by roots of iron deficient grasses (Gramineae), mobilize from calcareous soils not only iron (Fe) but also zinc (Zn), manganese (Mn) and copper (Cu). Mobilization of Fe may therefore be impaired by other micronutrient cations. This has been studied in both, model experiments with Fe hydroxide and with a calcareous soil (15% CaCO3, pH 8.6) amended with micronutrients as sulfate salts.
Mobilization of Fe from Fe hydroxide by phytosiderophores (epi-3-hydroxymugineic acid) was not affected by the addition of CaCl2, MgSO4 and MnSO4, slightly inhibited by ZnSO4 and strongly inhibited by CuSO4. In a calcareous soil amended with increasing levels of ZnSO4, MnSO4 and CuSO4, mobilization of Fe by phytosiderophores remained uneffected by Zn and Mn amendments but was progressively impaired by increasing levels of Cu amendment, correlated with corresponding enhancement of Cu mobilization.
High concentrations of ZnSO4 and MnSO4 and relatively high concentrations of CuSO4 were required for inhibition of Fe mobilization by phytosiderophores. It is therefore concluded that in most calcareous soils phytosiderophores efficiently mobilize Fe, and that phytosiderophores play an important role in Fe acquisition by grasses grown on calcareous soils.
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© 1991 Springer Science+Business Media Dordrecht
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Zhang, F.S., Treeby, M., RÖmheld, V., Marschner, H. (1991). Mobilization of iron by phytosiderophores as affected by other micronutrients. In: Chen, Y., Hadar, Y. (eds) Iron Nutrition and Interactions in Plants. Developments in Plant and Soil Sciences, vol 43. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3294-7_26
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DOI: https://doi.org/10.1007/978-94-011-3294-7_26
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