title: Nitrate transporters in plants: structure, function and regulation.
abstract: Physiological studies have established that plants acquire their NO(-3) from the soil through the combined activities of a set of high- and low-affinity NO(-3) transport systems, with the influx of NO(-3) being driven by the H(+) gradient across the plasma membrane. Some of these NO(-3) transport systems are constitutively expressed, while others are NO(-3)-inducible and subject to negative feedback regulation by the products of NO(-3) assimilation. Here we review recent progress in the characterisation of the two families of NO(-3) transporters that have so far been identified in plants, their structure and their regulation, and consider the evidence for their roles in NO(-3) acquisition. We also discuss what is currently known about the genetic basis of NO(-3) induction and feedback repression of the NO(-3) transport and assimilatory pathway in higher plants.
authors.affiliation: Biochemistry and Physiology Department, IACR-Rothamsted, Harpenden, UK. b.g.forde@lancaster.ac.uk
authors.forename: B G
authors.initials: BG
authors.lastname: Forde
mesh_terms: D027321:Anion Transport Proteins; D029681:Arabidopsis Proteins; D001693:Biological Transport, Active; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D015394:Molecular Structure; D000091285:Nitrate Transporters; D009566:Nitrates / Q000378:metabolism*; D010802:Phylogeny; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D006180:Proton-Translocating ATPases / Q000378:metabolism
chemical_list: D027321:Anion Transport Proteins; D029681:Arabidopsis Proteins; D002352:Carrier Proteins; D000091285:Nitrate Transporters; D009566:Nitrates; D010940:Plant Proteins; D006180:Proton-Translocating ATPases; C101492:NRT1.1 protein, Arabidopsis; C477335:NRT2.1 protein, Arabidopsis