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Gene Review

AMT1;3  -  ammonium transporter 1;3

Arabidopsis thaliana

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High impact information on ATAMT1;3

  • Transcript levels of AtAMT1;1, which possesses an affinity in the nanomolar range, steeply increased with ammonium uptake in roots when nitrogen nutrition became limiting, whereas those of AtAMT1;3 increased slightly, with AtAMT1;2 being more constitutively expressed [1].
  • In these N-deprived plants, mRNA copy numbers of root AtAMT1;3 and AtAMT2;1 mRNA were significantly more increased in the mutant than in wild-type plants [2].
  • Physiological studies on isolated mesophyll protoplasts with 15NH4+ revealed the presence of a high-affinity ammonium transporter that shared physiological similarity to the high-affinity NH4+ transporters in Arabidopsis thaliana (AtAMT1;3) [3].

Analytical, diagnostic and therapeutic context of ATAMT1;3

  • PCR techniques were used to isolate a full-length clone of a B. napus homologue of AMT1 from shoot mRNA which showed 97% similarity to AtAMT1;3 [3].


  1. Three functional transporters for constitutive, diurnally regulated, and starvation-induced uptake of ammonium into Arabidopsis roots. Gazzarrini, S., Lejay, L., Gojon, A., Ninnemann, O., Frommer, W.B., von Wirén, N. Plant Cell (1999) [Pubmed]
  2. Functional analysis of an Arabidopsis T-DNA "knockout" of the high-affinity NH4(+) transporter AtAMT1;1. Kaiser, B.N., Rawat, S.R., Siddiqi, M.Y., Masle, J., Glass, A.D. Plant Physiol. (2002) [Pubmed]
  3. Regulation of the high-affinity ammonium transporter (BnAMT1;2) in the leaves of Brassica napus by nitrogen status. Pearson, J.N., Finnemann, J., Schjoerring, J.K. Plant Mol. Biol. (2002) [Pubmed]
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