Effect of aluminum on the production of siderophore by Rhizobium sp. (Cicer arietinum).
Rhizobium sp. strain BICC 651 in the presence of 100 microM Al3+ produced a threefold higher level of siderophore than in the control culture under iron limitation during the stationary phase. Al3+ in increasing concentrations resulted in decreased growth, and the effect was alleviated by the addition of iron. Siderophore production decreased gradually in Al3+-treated culture as well as in the control with the addition of increasing concentrations of Fe3+, and at 50 microM Fe3+ the level of siderophore was practically undetectable. The siderophore binds Fe3+ and also Al3+. The outer membrane protein profiles of the bacteria grown in the presence or absence of Al3+ were indistinguishable.
Department of Microbiology, Bose Institute, Calcutta, India.
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Roy
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Chakrabartty
D017607:Aluminum Compounds / Q000378:metabolism* / Q000494:pharmacology; D001425:Bacterial Outer Membrane Proteins / Q000032:analysis; D004591:Electrophoresis, Polyacrylamide Gel; D007887:Fabaceae / Q000382:microbiology*; D005290:Ferric Compounds / Q000378:metabolism; D010946:Plants, Medicinal; D012231:Rhizobium / Q000378:metabolism*; D017262:Siderophores / Q000032:analysis / Q000096:biosynthesis*; D013053:Spectrophotometry
D017607:Aluminum Compounds; D001425:Bacterial Outer Membrane Proteins; D005290:Ferric Compounds; D017262:Siderophores