Ferrous iron is transported across the peribacteroid membrane of soybean nodules |
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Authors: | Sophie Moreau David A. Day Alain Puppo |
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Affiliation: | (1) Laboratoire de Biologie Végétale et Microbiologie, CNRS ERS 590, Université de Nice-Sophia Antipolis, Parc Valrose, F-06108 Nice Cedex 2, France, FR;(2) Division of Biochemistry and Molecular Biology, Faculty of Science, Australian National University, Canberra ACT 0200, Australia, AU |
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Abstract: | Symbiosomes and bacteroids isolated from soybean (Glycine max Merr.) nodules are able to take up ferrous iron. This uptake activity was completely abolished in the presence of ferrous-iron chelators. The kinetics of uptake were characterized by initially high rates of iron internalization, but no saturation was observed with increasing iron concentration. This process does not appear to involve the ferric reductase of the peribacteroid membrane. The transport of ferrous iron was inhibited by other transition metals, particularly copper. Ferrous iron was taken up by symbiosomes more efficiently than the ferric form. This indicates that the iron transport from the plant host cell to the microsymbiont in vivo may occur mainly as the ferrous form. Received: 11 February 1998 / Accepted: 29 May 1998 |
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Keywords: | : Ferrous iron uptake Glycine (iron uptake) Nitrogen fixation Peribacteroid membrane Root nodule |
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