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Nitrate transporters in plants: structure, function and regulation.

B G Forde1

  • 1Biochemistry and Physiology Department, IACR-Rothamsted, Harpenden, UK. b.g.forde@lancaster.ac.uk

Biochimica Et Biophysica Acta
|April 5, 2000
PubMed
Summary

Plants absorb nitrate (NO3-) from soil via high- and low-affinity transport systems, driven by proton gradients. This review details nitrate transporter families, their regulation, and genetic control of nitrate uptake and assimilation in plants.

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Area of Science:

  • Plant Physiology
  • Molecular Biology
  • Biochemistry

Background:

  • Plants acquire nitrate (NO3-) from soil via distinct high- and low-affinity transport systems.
  • Nitrate influx is driven by the proton (H+) gradient across the plasma membrane.
  • Nitrate transporters exhibit varied expression patterns, including constitutive and inducible forms, with feedback regulation by assimilation products.

Purpose of the Study:

  • To review recent advancements in characterizing plant nitrate transporter families.
  • To explore the structure, regulation, and physiological roles of these transporters in nitrate acquisition.
  • To discuss the genetic mechanisms underlying nitrate induction and feedback repression in plant nitrate assimilation pathways.

Main Methods:

  • Literature review of physiological and molecular studies on plant nitrate transport.

Related Experiment Videos

  • Analysis of current research on the structure and function of identified nitrate transporter families.
  • Synthesis of data on the genetic regulation of nitrate uptake and assimilation.

    • Main Results:

    • Two major families of plant nitrate transporters have been identified.
    • Detailed characterization of their structure, expression, and regulatory mechanisms is emerging.
    • Evidence supports their crucial roles in plant nitrate acquisition and assimilation.

    Conclusions:

    • Understanding plant nitrate transporters is key to optimizing nitrogen use efficiency.
    • Genetic regulation of nitrate transport and assimilation pathways offers targets for crop improvement.
    • Further research into transporter families and their regulation will enhance agricultural productivity.