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Ammonium transport and CitAMT1 expression are regulated by N in Citrus plants

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Ammonium transport and CitAMT1 expression are regulated by N in Citrus plants

Auteurs : Gemma Camanes [Espagne] ; Miguel Cerezo [Espagne] ; Eduardo Primo-Millo [Espagne] ; Alain Gojon [France] ; Pilar Garcia-Agustin [Espagne]

Source :

Planta [ 0032-0935 ] ; 2009.

RBID : Pascal:09-0106711

Descripteurs français

Pascal (Inist)
- Affinité, Système, Biologie végétale, Citrus, Ammonium, <<>>.

English descriptors

KwdEn :
- Affinity, Ammonium, Citrus, Plant biology, System.

Abstract

Citrus seedlings (Citrus sinensis L. Osbeck x Poncirus trifoliata Blanco) were used to describe the effects of different N treatments on the NH₄⁺ influx mediated by high- and low-affinity transport systems (HATS and LATS, respectively) and CitAMTI gene expression. Results show that Citrus plants favor NH₄⁺ over NO₃^- influx mediated by HATS and LATS when both N sources are present in the nutrient solution and Citrus plants display a much higher capacity to take up NH₄⁺ than NO₃^-. Furthermore, NH₄⁺ exerts a regulatory effect on NH₄⁺ HATS activity and CitAMT1 expression, both are down-regulated by high N status of the plant, but specifically stimulated by NH₄⁺ and the balance between these two opposite effects depends on the prior nutrition regime of the plant. On the other hand, supply of NO₃^- inhibits CitAMTI expression but doesn't affect NH₄⁺ HATS activity on the roots. To explain this discrepancy, it is possible that other CitAMT1 transporters, up-regulated by N limitation, but not repressed by NO₃^- could be involved in the stimulation of NH₄⁺ HATS activity under pure NO₃^- nutrition or CitAMTl transporter could be regulated at the post-transcriptional level.

Affiliations:

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Le document en format XML

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<author><name sortKey="Camanes, Gemma" sort="Camanes, Gemma" uniqKey="Camanes G" first="Gemma" last="Camanes">Gemma Camanes</name>
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<s2>12071 Castellón de la Plana</s2>
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<country>Espagne</country>
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<author><name sortKey="Cerezo, Miguel" sort="Cerezo, Miguel" uniqKey="Cerezo M" first="Miguel" last="Cerezo">Miguel Cerezo</name>
<affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Laboratorio de Bioquímica y Biotecnología. Área de Fisiología Vegetal, Departamento de Ciencias Agrarias y del Medio Natural, Escuela Superior de Tecnología y Ciencias Experimentales, Universitat Jaume I</s1>
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<author><name sortKey="Garcia Agustin, Pilar" sort="Garcia Agustin, Pilar" uniqKey="Garcia Agustin P" first="Pilar" last="Garcia-Agustin">Pilar Garcia-Agustin</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Ammonium transport and CitAMT1 expression are regulated by N in Citrus plants</title>
<author><name sortKey="Camanes, Gemma" sort="Camanes, Gemma" uniqKey="Camanes G" first="Gemma" last="Camanes">Gemma Camanes</name>
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<author><name sortKey="Cerezo, Miguel" sort="Cerezo, Miguel" uniqKey="Cerezo M" first="Miguel" last="Cerezo">Miguel Cerezo</name>
<affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Laboratorio de Bioquímica y Biotecnología. Área de Fisiología Vegetal, Departamento de Ciencias Agrarias y del Medio Natural, Escuela Superior de Tecnología y Ciencias Experimentales, Universitat Jaume I</s1>
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</inist:fA14>
<country>Espagne</country>
<placeName><region nuts="2" type="communauté">Communauté valencienne</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Primo Millo, Eduardo" sort="Primo Millo, Eduardo" uniqKey="Primo Millo E" first="Eduardo" last="Primo-Millo">Eduardo Primo-Millo</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Departamento de Citricultura, Instituto Valenciano de Investigaciones Agrarias, Apartado oficial</s1>
<s2>46113 Moncada, Valencia</s2>
<s3>ESP</s3>
<sZ>3 aut.</sZ>
</inist:fA14>
<country>Espagne</country>
<wicri:noRegion>46113 Moncada, Valencia</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Gojon, Alain" sort="Gojon, Alain" uniqKey="Gojon A" first="Alain" last="Gojon">Alain Gojon</name>
<affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Biochimie et Physiologie Moléculaire des plantes, UMR 5004, Agro-M, CNRS, UM2, Place Viala</s1>
<s2>34060 Montpellier</s2>
<s3>FRA</s3>
<sZ>4 aut.</sZ>
</inist:fA14>
<country>France</country>
<placeName><region type="region" nuts="2">Occitanie (région administrative)</region>
<region type="old region" nuts="2">Languedoc-Roussillon</region>
<settlement type="city">Montpellier</settlement>
</placeName>
</affiliation>
</author>
<author><name sortKey="Garcia Agustin, Pilar" sort="Garcia Agustin, Pilar" uniqKey="Garcia Agustin P" first="Pilar" last="Garcia-Agustin">Pilar Garcia-Agustin</name>
<affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Laboratorio de Bioquímica y Biotecnología. Área de Fisiología Vegetal, Departamento de Ciencias Agrarias y del Medio Natural, Escuela Superior de Tecnología y Ciencias Experimentales, Universitat Jaume I</s1>
<s2>12071 Castellón de la Plana</s2>
<s3>ESP</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>5 aut.</sZ>
</inist:fA14>
<country>Espagne</country>
<placeName><region nuts="2" type="communauté">Communauté valencienne</region>
</placeName>
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<series><title level="j" type="main">Planta</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Affinity</term>
<term>Ammonium</term>
<term>Citrus</term>
<term>Plant biology</term>
<term>System</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Affinité</term>
<term>Système</term>
<term>Biologie végétale</term>
<term>Citrus</term>
<term>Ammonium</term>
<term><<>></term>
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<front><div type="abstract" xml:lang="en">Citrus seedlings (Citrus sinensis L. Osbeck x Poncirus trifoliata Blanco) were used to describe the effects of different N treatments on the NH<sub>4</sub>
<sup>+</sup>
 influx mediated by high- and low-affinity transport systems (HATS and LATS, respectively) and CitAMTI gene expression. Results show that Citrus plants favor NH<sub>4</sub>
<sup>+</sup>
 over NO<sub>3</sub>
<sup>-</sup>
 influx mediated by HATS and LATS when both N sources are present in the nutrient solution and Citrus plants display a much higher capacity to take up NH<sub>4</sub>
<sup>+</sup>
 than NO<sub>3</sub>
<sup>-</sup>
. Furthermore, NH<sub>4</sub>
<sup>+</sup>
 exerts a regulatory effect on NH<sub>4</sub>
<sup>+</sup>
 HATS activity and CitAMT1 expression, both are down-regulated by high N status of the plant, but specifically stimulated by NH<sub>4</sub>
<sup>+</sup>
 and the balance between these two opposite effects depends on the prior nutrition regime of the plant. On the other hand, supply of NO<sub>3</sub>
<sup>-</sup>
 inhibits CitAMTI expression but doesn't affect NH<sub>4</sub>
<sup>+</sup>
 HATS activity on the roots. To explain this discrepancy, it is possible that other CitAMT1 transporters, up-regulated by N limitation, but not repressed by NO<sub>3</sub>
<sup>-</sup>
 could be involved in the stimulation of NH<sub>4</sub>
<sup>+</sup>
 HATS activity under pure NO<sub>3</sub>
<sup>-</sup>
 nutrition or CitAMTl transporter could be regulated at the post-transcriptional level.</div>
</front>
</TEI>
<affiliations><list><country><li>Espagne</li>
<li>France</li>
</country>
<region><li>Communauté valencienne</li>
<li>Languedoc-Roussillon</li>
<li>Occitanie (région administrative)</li>
</region>
<settlement><li>Montpellier</li>
</settlement>
</list>
<tree><country name="Espagne"><region name="Communauté valencienne"><name sortKey="Camanes, Gemma" sort="Camanes, Gemma" uniqKey="Camanes G" first="Gemma" last="Camanes">Gemma Camanes</name>
</region>
<name sortKey="Cerezo, Miguel" sort="Cerezo, Miguel" uniqKey="Cerezo M" first="Miguel" last="Cerezo">Miguel Cerezo</name>
<name sortKey="Garcia Agustin, Pilar" sort="Garcia Agustin, Pilar" uniqKey="Garcia Agustin P" first="Pilar" last="Garcia-Agustin">Pilar Garcia-Agustin</name>
<name sortKey="Primo Millo, Eduardo" sort="Primo Millo, Eduardo" uniqKey="Primo Millo E" first="Eduardo" last="Primo-Millo">Eduardo Primo-Millo</name>
</country>
<country name="France"><region name="Occitanie (région administrative)"><name sortKey="Gojon, Alain" sort="Gojon, Alain" uniqKey="Gojon A" first="Alain" last="Gojon">Alain Gojon</name>
</region>
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</tree>
</affiliations>
</record>

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Ammonium transport and CitAMT1 expression are regulated by N in Citrus plants

Ammonium transport and CitAMT1 expression are regulated by N in Citrus plants

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Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

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