OrangerV1, France, Analysis, bibRecord, 000161

Ammonium transport and CitAMT1 expression are regulated by light and sucrose in Citrus plants

Identifieur interne : 000161 ( France/Analysis ); précédent : 000160; suivant : 000162

Ammonium transport and CitAMT1 expression are regulated by light and sucrose in Citrus plants

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

Source :

Journal of experimental botany [ 0022-0957 ] ; 2007.

RBID : Pascal:08-0012595

Descripteurs français

Pascal (Inist)
- Citrus.

English descriptors

KwdEn :
- Citrus.

Abstract

Here the isolation and characterization of CitAMT1 cDNA from citrange Troyer (Citrus sinensis L. OsbeckxPoncirus 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 NH⁺₄ 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 NH⁺₄ HATS activity. On the other hand, results indicate that the effect of stimulating light on CitAMT1 expression and NH⁺₄ 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.

Affiliations:

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Pascal:08-0012595

Le document en format XML

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<front><div type="abstract" xml:lang="en">Here the isolation and characterization of CitAMT1 cDNA from citrange Troyer (Citrus sinensis L. OsbeckxPoncirus 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 NH<sup>+</sup>
<sub>4</sub>
 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 NH<sup>+</sup>
<sub>4</sub>
 HATS activity. On the other hand, results indicate that the effect of stimulating light on CitAMT1 expression and NH<sup>+</sup>
<sub>4</sub>
 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>
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Ammonium transport and CitAMT1 expression are regulated by light and sucrose in Citrus plants

Ammonium transport and CitAMT1 expression are regulated by light and sucrose in Citrus plants

Source :

Descripteurs français

English descriptors

Abstract

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

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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