A putative ECF σ factor gene, rpoI, regulates siderophore production in Rhizobium leguminosarum

Kay H. Yeoman, Alex G. May, Nicola G. deLuca, Daniel B. Stuckey, Andrew W. B. Johnston

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A cloned Rhizobium leguminosarum gene, termed rpoI, when transferred to wild-type strains, caused overproduction of the siderophore vicibactin. An rpoI mutant was defective in Fe uptake but was unaffected in symbiotic N fixation. The RpoI gene product was similar in sequence to extra-cytoplasmic s factors of RNA polymerase. Transcription of rpoI was reduced in cells grown in medium that was replete with Fe.
Original languageEnglish
Pages (from-to)994-999
Number of pages6
JournalMolecular Plant-Microbe Interactions
Issue number11
Publication statusPublished - 1 Nov 1999


  • ccm
  • Nodules
  • Peas

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