An arabidopsis T-DNA mutant affected in Nrt2 genes is impaired in nitrate uptake

FEBS Lett. 2001 Feb 2;489(2-3):220-4. doi: 10.1016/s0014-5793(01)02096-8.


Expression analyses of Nrt2 plant genes have shown a strict correlation with root nitrate influx mediated by the high-affinity transport system (HATS). The precise assignment of NRT2 protein function has not yet been possible due to the absence of heterologous expression studies as well as loss of function mutants in higher plants. Using a reverse genetic approach, we isolated an Arabidopsis thaliana knock-out mutant where the T-DNA insertion led to the complete deletion of the AtNrt2.1 gene together with the deletion of the 3' region of the AtNrt2.2 gene. This mutant is impaired in the HATS, without being modified in the low-affinity system. Moreover, the de-regulated expression of a Nicotiana plumbaginifolia Nrt2 gene restored the mutant nitrate influx to that of the wild-type. These results demonstrate that plant NRT2 proteins do have a role in HATS.

MeSH terms

  • Anion Transport Proteins*
  • Arabidopsis / genetics*
  • Arabidopsis / metabolism
  • Arabidopsis Proteins*
  • Biological Transport, Active / genetics
  • Carrier Proteins / genetics*
  • DNA, Bacterial / genetics*
  • Genetic Complementation Test
  • Genotype
  • Kinetics
  • Mutagenesis, Insertional
  • Mutation
  • Nitrates / metabolism
  • Nitrates / pharmacokinetics*
  • Plant Proteins*
  • Plant Roots / genetics
  • Plant Roots / metabolism
  • Plants, Genetically Modified
  • Plants, Toxic
  • Tobacco / genetics


  • Anion Transport Proteins
  • Arabidopsis Proteins
  • Carrier Proteins
  • DNA, Bacterial
  • NRT2 protein, Arabidopsis
  • Nitrates
  • Plant Proteins
  • T-DNA
  • nitrate transporters