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. 1990 Aug;93(4):1426–1432. doi: 10.1104/pp.93.4.1426

Studies of the Uptake of Nitrate in Barley

I. Kinetics of 13NO3− Influx

M Yaeesh Siddiqi 1,2,3, Anthony D M Glass 1,2,3,1, Thomas J Ruth 1,2,3, Thomas W Rufty Jr 1,2,3
PMCID: PMC1062690  PMID: 16667635

Abstract

13NO3− was used to investigate patterns of NO3− influx into roots of barley plants (Hordeum vulgare L. cv Klondike) previously grown with (`induced') or without (`uninduced') a source of external NO3− ([NO3−]0). In both induced and uninduced plants, 13NO3− influx was biphasic in the range from 0.005 to 50 moles per cubic meter [NO3−]0. In the low concentration range (<1 mole per cubic meter for induced plants and <0.3 mole per cubic meter for uninduced plants), influx was saturable and Vmax and Km values for influx either increased or decreased according to NO3− pretreatment. By contrast, 13NO3− influx in the high concentration range revealed a strictly linear concentration dependence. These fluxes appeared to be mediated by a constitutive, rather than an inducible, transport system.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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