Ammonium fluxes into plant roots: Energetics, kinetics and regulation

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dc.creatorGlass, Anthony D. M.
dc.creatorErner, Yair
dc.creatorKronzucker, Herbert J.
dc.creatorSchjoerring, Jan K.
dc.creatorSiddiqi, M. Yaeesh
dc.creatorWang, M.-Yuan
dc.date1997-01
dc.date2024-12-19T12:56:21Z
dc.date2024-12-19T12:56:21Z
dc.date.accessioned2026-06-27T04:08:13Z
dc.descriptionAmmonium uptake across the plasma membranes of seedling roots of intact rice plants is thermodynamically active at low external concentrations, and consequently, electrogenic uniport is an unlikely mechanism for influx. At higher NH4+ concentrations uptake is passive and electrogenic uniport is a possibility. While passive permeation of NH3 is also possible at high external [NH4+], influx measurements at 10 mM NH4+ demonstrated a pH dependence which was inconsistent with significant NH3 permeation. Kinetic studies using 13NH4+ established that influx at low external [H4+] occurred via high affinity transport systems (HATS) in rice and spruce, while at higher [NH4+], influx was mediated by low affinity transport systems (LATS), that showed linear concentration dependence. Ammonium influx via the HATS was shown to be up‐regulated or down‐regulated in response to changes of N status, whereas influx in the LATS was insensitive to N status. The identity or identities of the regulatory signals responsible for controlling influx are discussed.
dc.identifierhttps://hdl.handle.net/10568/166504
dc.identifier.urihttp://hdl.handle.net/123456789/22729
dc.languageen
dc.publisherWiley
dc.sourceGlass, Anthony D. M.; Erner, Yair; Kronzucker, Herbert J.; Schjoerring, Jan K.; Siddiqi, M. Yaeesh and Wang, M.‐Yuan. 2007. Ammonium fluxes into plant roots: Energetics, kinetics and regulation. J Plant Nutrition andamp; Soil, Volume 160 no. 2 p. 261-268
dc.titleAmmonium fluxes into plant roots: Energetics, kinetics and regulation
dc.typeJournal Article

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Instituto Internacional de Investigación del Arroz (IRRI)