Feedback Regulation of Nitrate Influx in Barley Roots by Nitrate, Nitrite, and Ammonium.

  title={Feedback Regulation of Nitrate Influx in Barley Roots by Nitrate, Nitrite, and Ammonium.},
  author={B. J. King and Mohammad Siddiqi and Thomas J. Ruth and Robert L. Warner and A. S. Glass},
  journal={Plant physiology},
  volume={102 4},
The short-lived radiotracer 13N was used to study feedback regulation of nitrate influx through the inducible high-affinity transport system of barley (Hordeum vulgare L. cv Steptoe) roots. Both wild-type plants and the mutant line Az12:Az70 (genotype nar1a;nar7w), which is deficient in the NADH-specific and NAD(P)H-bispecific nitrate reductases (R.L. Warner, R.C. Huffaker [1989] Plant Physiol 91: 947-953) showed strong feedback inhibition of nitrate influx within approximately 5 d of exposure… CONTINUE READING
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