Abstract
A Uruguayan rhizobia collection (67 isolates) obtained from nodules of Medicago sativa, Melilotus albus, Medicago polymorpha, Trifolium subterraneum, Trifolium repens, Trifolium vesiculosum, Lotus corniculatus, Lotus subbiflorus, Lotus pedunculatus, Ornithopus sp. and Adesmia sp. has been examined to assess the occurrence of high affinity iron uptake systems.
CAS (Chrome-azurol S)-assay results suggested that most of the free-living form of these microsymbionts may produce siderophores. The highest siderophore production was observed among Medicago and Trifolium microsymbionts whereas no siderophore expression or moderate positive results were found among Lotus microsymbionts; suggesting that microsymbionts of legumes growing on neutral or alkaline soils may express in vitro enhanced siderophore production.
Electrophoretic patterns of outer-membrane protein enriched fractions revealed that iron-limited microsymbionts of Medicago sativa, Lotus corniculatus, Lotus subbiflorus, Trifolium repens, Trifolium subterraneum and Ornithopus sp. produced high molecular weight proteins (ranging from 64 to 94 kDa) compared to cells grown in iron-sufficient media.
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Fabiano, E., Gualtieri, G., Pritsch, C. et al. Extent of high-affinity iron transport systems in field isolates of rhizobia. Plant Soil 164, 177–185 (1994). https://doi.org/10.1007/BF00010069
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DOI: https://doi.org/10.1007/BF00010069