title: Metals and the rhizobial-legume symbiosis--uptake, utilization and signalling.
abstract: In this review, we consider how the nitrogen-fixing root nodule bacteria, the 'rhizobia', acquire various metals, paying particular attention to the uptake of iron. We also review the literature pertaining to the roles of molybdenum and nickel in the symbiosis with legumes. We highlight some gaps in our knowledge, for example the lack of information on how rhizobia acquire molybdenum. We examine the means whereby different metals affect rhizobial physiology and the role of metals as signals for gene regulation. We describe the ways in which genetics has shown (or not) if, and how, particular metal uptake and/or metal-mediated signalling pathways are required for the symbiotic interaction with legumes.
authors.affiliation: School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, UK. A.Johnston@uea.ac.uk
authors.forename: A W
authors.initials: AW
authors.lastname: Johnston
authors.forename: K H
authors.initials: KH
authors.lastname: Yeoman
authors.forename: M
authors.initials: M
authors.lastname: Wexler
mesh_terms: D007887:Fabaceae / Q000737:chemistry / Q000502:physiology*; D018506:Gene Expression Regulation, Plant / Q000502:physiology; D019216:Metals, Heavy / Q000378:metabolism*; D012230:Rhizobiaceae / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D015398:Signal Transduction / Q000502:physiology; D013559:Symbiosis / Q000502:physiology
chemical_list: D019216:Metals, Heavy