Ammonium transport and CitAMT1 expression are regulated by light and sucrose in Citrus plants
Identifieur interne : 002360 ( Main/Exploration ); précédent : 002359; suivant : 002361Ammonium transport and CitAMT1 expression are regulated by light and sucrose in Citrus plants
Auteurs : Gemma Camaes [Espagne] ; Miguel Cerezo [Espagne] ; Eduardo Primo-Millo [Espagne] ; Alain Gojon [France] ; Pilar Garca-Agustn [Espagne]Source :
- Journal of Experimental Botany [ 0022-0957 ] ; 2007-07-05.
English descriptors
- KwdEn :
- Biological Transport, Citrus sinensis (genetics), Citrus sinensis (metabolism), Citrus sinensis (radiation effects), DNA, Complementary (metabolism), Gene Expression Regulation, Plant, Light, Photosynthesis, Plant Proteins (genetics), Plant Proteins (metabolism), Plant Roots (metabolism), Quaternary Ammonium Compounds (metabolism), Sucrose (metabolism).
- MESH :
- chemical , genetics : Plant Proteins.
- chemical , metabolism : DNA, Complementary, Plant Proteins, Quaternary Ammonium Compounds, Sucrose.
- genetics : Citrus sinensis.
- metabolism : Citrus sinensis, Plant Roots.
- radiation effects : Citrus sinensis.
- mix :
Abstract
Here the isolation and characterization of CitAMT1 cDNA from citrange Troyer (Citrus sinensis L. OsbeckPoncirus trifoliata Blanco) is reported, suggesting that this belongs to the AMT gene family, which is involved in the high-affinity transport system (HATS). Results show that in Citrus plants, the HATS is much more dependent on the light conditions and C status of the roots than the low-affinity transport system. Most importantly, a strong correlation was found between the regulation of both HATS activity and CitAMT1 expression. CitAMT1 expression is sucrose-stimulated and may account for the regulation of NH4 HATS. Furthermore, a similar link was also recorded with photosynthetic activity in the shoots, suggesting that the variations in production and transport of photosynthates to the roots are responsible for the diurnal changes of both CitAMT1 expression and NH4 HATS activity. On the other hand, results indicate that the effect of stimulating light on CitAMT1 expression and NH4 HATS activity is independent of the circadian rhythm. Finally, CitAMT1 expression seems to be specifically stimulated by sucrose, suggesting that sucrose is a pivotal signal governing both assimilate partitioning from source organs and assimilate utilization in sink organs.
Url:
- https://api.istex.fr/document/08BC2860C6C93B5D210283A3C596B5EE60F7BC48/fulltext/pdf
- https://hal.archives-ouvertes.fr/hal-00191084
DOI: 10.1093/jxb/erm135
Affiliations:
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Le document en format XML
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xml:lang="en"><term>Biological Transport</term><term>Citrus sinensis (genetics)</term><term>Citrus sinensis (metabolism)</term><term>Citrus sinensis (radiation effects)</term><term>DNA, Complementary (metabolism)</term><term>Gene Expression Regulation, Plant</term><term>Light</term><term>Photosynthesis</term><term>Plant Proteins (genetics)</term><term>Plant Proteins (metabolism)</term><term>Plant Roots (metabolism)</term><term>Quaternary Ammonium Compounds (metabolism)</term><term>Sucrose (metabolism)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="genetics" xml:lang="en"><term>Plant Proteins</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>DNA, Complementary</term><term>Plant Proteins</term><term>Quaternary Ammonium Compounds</term><term>Sucrose</term></keywords><keywords scheme="MESH" qualifier="genetics" xml:lang="en"><term>Citrus sinensis</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Citrus sinensis</term><term>Plant Roots</term></keywords><keywords scheme="MESH" qualifier="radiation effects" xml:lang="en"><term>Citrus sinensis</term></keywords><keywords scheme="mix" xml:lang="en"><term>AMT</term><term>Biological Transport</term><term>Citrus</term><term>Gene Expression Regulation, Plant</term><term>HATS</term><term>LATS</term><term>Light</term><term>NH4+ uptake</term><term>Photosynthesis</term><term>sucrose</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Here the isolation and characterization of CitAMT1 cDNA from citrange Troyer (Citrus sinensis L. OsbeckPoncirus trifoliata Blanco) is reported, suggesting that this belongs to the AMT gene family, which is involved in the high-affinity transport system (HATS). Results show that in Citrus plants, the HATS is much more dependent on the light conditions and C status of the roots than the low-affinity transport system. Most importantly, a strong correlation was found between the regulation of both HATS activity and CitAMT1 expression. CitAMT1 expression is sucrose-stimulated and may account for the regulation of NH4 HATS. Furthermore, a similar link was also recorded with photosynthetic activity in the shoots, suggesting that the variations in production and transport of photosynthates to the roots are responsible for the diurnal changes of both CitAMT1 expression and NH4 HATS activity. On the other hand, results indicate that the effect of stimulating light on CitAMT1 expression and NH4 HATS activity is independent of the circadian rhythm. Finally, CitAMT1 expression seems to be specifically stimulated by sucrose, suggesting that sucrose is a pivotal signal governing both assimilate partitioning from source organs and assimilate utilization in sink organs.</div></front></TEI><affiliations><list><country><li>Espagne</li><li>France</li></country></list><tree><country name="Espagne"><noRegion><name sortKey="Camaes, Gemma" sort="Camaes, Gemma" uniqKey="Camaes G" first="Gemma" last="Camaes">Gemma Camaes</name></noRegion><name sortKey="Cerezo, Miguel" sort="Cerezo, Miguel" uniqKey="Cerezo M" first="Miguel" last="Cerezo">Miguel Cerezo</name><name sortKey="Cerezo, Miguel" sort="Cerezo, Miguel" uniqKey="Cerezo M" first="Miguel" last="Cerezo">Miguel Cerezo</name><name sortKey="Garca Agustn, Pilar" sort="Garca Agustn, Pilar" uniqKey="Garca Agustn P" first="Pilar" last="Garca-Agustn">Pilar Garca-Agustn</name><name sortKey="Garca Agustn, Pilar" sort="Garca Agustn, Pilar" uniqKey="Garca Agustn P" first="Pilar" last="Garca-Agustn">Pilar Garca-Agustn</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"><noRegion><name sortKey="Gojon, Alain" sort="Gojon, Alain" uniqKey="Gojon A" first="Alain" last="Gojon">Alain Gojon</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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