Ammonium transport and CitAMT1 expression are regulated by N in Citrus plants.
Identifieur interne : 000000 ( Hal/Corpus ); suivant : 000001Ammonium transport and CitAMT1 expression are regulated by N in Citrus plants.
Auteurs : Gemma Cama Es ; Miguel Cerezo ; Eduardo Primo-Millo ; Alain Gojon ; Pilar García-AgustínSource :
- Planta [ 0032-0935 ] ; 2009-01.
English descriptors
- mix :
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 CitAMT1 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 CitAMT1 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 CitAMT1 transporter could be regulated at the post-transcriptional level.
Url:
DOI: 10.1007/s00425-008-0833-y
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Hal:hal-00408943Le document en format XML
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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 NH4+ influx mediated by high- and low-affinity transport systems (HATS and LATS, respectively) and CitAMT1 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 CitAMT1 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 CitAMT1 transporter could be regulated at the post-transcriptional level.</div>
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<author role="aut"><persName><forename type="first">Alain</forename>
<surname>Gojon</surname>
</persName>
<idno type="halAuthorId">158103</idno>
<affiliation ref="#struct-538"></affiliation>
</author>
<author role="aut"><persName><forename type="first">Pilar</forename>
<surname>García-Agustín</surname>
</persName>
<idno type="halAuthorId">230181</idno>
<affiliation ref="#struct-49269"></affiliation>
</author>
</analytic>
<monogr><idno type="halJournalId" status="VALID">7828</idno>
<idno type="issn">0032-0935</idno>
<idno type="eissn">1432-2048</idno>
<title level="j">Planta</title>
<imprint><publisher>Springer Verlag</publisher>
<biblScope unit="volume">229</biblScope>
<biblScope unit="issue">2</biblScope>
<biblScope unit="pp">331-42</biblScope>
<date type="datePub">2009-01</date>
<date type="dateEpub">2008-11-21</date>
</imprint>
</monogr>
<idno type="doi">10.1007/s00425-008-0833-y</idno>
<idno type="pubmed">19023591</idno>
</biblStruct>
</sourceDesc>
<profileDesc><langUsage><language ident="en">English</language>
</langUsage>
<textClass><keywords scheme="author"><term xml:lang="en">Ammonium</term>
<term xml:lang="en">Ammonium transporter</term>
<term xml:lang="en">Citrus</term>
<term xml:lang="en">High-affinity transport system</term>
<term xml:lang="en">Low-affinity transport system</term>
</keywords>
<classCode scheme="classification">ACL</classCode>
<classCode scheme="mesh">Biological Transport</classCode>
<classCode scheme="mesh">Citrus</classCode>
<classCode scheme="mesh">Quaternary Ammonium Compounds</classCode>
<classCode scheme="mesh">Solutions</classCode>
<classCode scheme="mesh">Gene Expression Regulation, Plant</classCode>
<classCode scheme="mesh">Kinetics</classCode>
<classCode scheme="mesh">Nitrates</classCode>
<classCode scheme="mesh">Nitrogen</classCode>
<classCode scheme="mesh">Organ Specificity</classCode>
<classCode scheme="mesh">Plant Proteins</classCode>
<classCode scheme="mesh">Plant Roots</classCode>
<classCode scheme="mesh">Plant Shoots</classCode>
<classCode scheme="halDomain" n="sdv.bv">Life Sciences [q-bio]/Vegetal Biology</classCode>
<classCode scheme="halTypology" n="ART">Journal articles</classCode>
</textClass>
<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 NH4+ influx mediated by high- and low-affinity transport systems (HATS and LATS, respectively) and CitAMT1 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 CitAMT1 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 CitAMT1 transporter could be regulated at the post-transcriptional level.</abstract>
</profileDesc>
</hal>
</record>
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