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Regulation of Nitrate Transport in Citrus Rootstocks Depending on Nitrogen Availability

Identifieur interne : 002275 ( Main/Exploration ); précédent : 002274; suivant : 002276

Regulation of Nitrate Transport in Citrus Rootstocks Depending on Nitrogen Availability

Auteurs : Miguel Cerezo [Espagne] ; Gemma Cama Es [Espagne] ; Víctor Flors [Espagne] ; Eduardo Primo-Millo [Espagne] ; Pilar García-Agustín [Espagne]

Source :

Plant Signaling & Behavior [ 1559-2316 ] ; 2007.

RBID : PMC:2634206

Abstract

Previously, we reported that in Citrus plants, nitrate influx through the plasmalemma of roots cells follows a biphasic pattern, suggesting the existence of at least two different uptake systems, a high and low affinity transport system (HATS and LATS, respectively). Here, we describe a novel inducible high affinity transport system (iHATS). This new nitrate transport system has a high capacity to uptake nitrate in two different Citrus rootstocks (Cleopatra mandarin and Troyer citrange). The iHATS was saturable, showing higher affinity than constitutive high affinity transport system (cHATS) to the substrate NO₃⁻. The V_max for this saturable component iHATS was higher than cHATS, reaching similar values in both rootstocks.

Additionally, we studied the regulation of root NO₃⁻ uptake mediated by both HATS (iHATS and cHATS) and LATS. In both rootstocks, cHATS is constitutive and independent of N-status. Concerning the regulation of iHATS, this system is upregulated by NO₃⁻ and down-regulated by the N status and by NO₃⁻ itself when plants are exposed to it for a longer period of time. LATS in Cleopatra mandarin and Troyer citrange rootstocks is repressed by the N-status.

The use of various metabolic uncouplers or inhibitors indicated that NO₃⁻ net uptake mediated by iHATS and LATS was an active transport system in both rootstocks.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2634206

PubMed: 19516998
PubMed Central: 2634206

Affiliations:

Espagne

Le document en format XML

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<front><div type="abstract" xml:lang="en"><p>Previously, we reported that in Citrus plants, nitrate influx through the plasmalemma of roots cells follows a biphasic pattern, suggesting the existence of at least two different uptake systems, a high and low affinity transport system (HATS and LATS, respectively). Here, we describe a novel inducible high affinity transport system (iHATS). This new nitrate transport system has a high capacity to uptake nitrate in two different <italic>Citrus</italic>
 rootstocks (Cleopatra mandarin and Troyer citrange). The iHATS was saturable, showing higher affinity than constitutive high affinity transport system (cHATS) to the substrate NO<sub>3</sub>
<sup>−</sup>
. The V<sub>max</sub>
 for this saturable component iHATS was higher than cHATS, reaching similar values in both rootstocks.</p>
<p>Additionally, we studied the regulation of root NO<sub>3</sub>
<sup>−</sup>
 uptake mediated by both HATS (iHATS and cHATS) and LATS. In both rootstocks, cHATS is constitutive and independent of N-status. Concerning the regulation of iHATS, this system is upregulated by NO<sub>3</sub>
<sup>−</sup>
 and down-regulated by the N status and by NO<sub>3</sub>
<sup>−</sup>
 itself when plants are exposed to it for a longer period of time. LATS in Cleopatra mandarin and Troyer citrange rootstocks is repressed by the N-status.</p>
<p>The use of various metabolic uncouplers or inhibitors indicated that NO<sub>3</sub>
<sup>−</sup>
 net uptake mediated by iHATS and LATS was an active transport system in both rootstocks.</p>
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Regulation of Nitrate Transport in Citrus Rootstocks Depending on Nitrogen Availability

Regulation of Nitrate Transport in Citrus Rootstocks Depending on Nitrogen Availability

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