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dc.contributor.authorCamanes, Gemma
dc.contributor.authorCerezo, Miguel
dc.contributor.authorPrimo-Millo, Eduardo 
dc.contributor.authorGojon, Alain
dc.contributor.authorGarcía-Agustín, Pilar
dc.identifier.citationCamanes, Gemma, Cerezo, Miguel, Primo-Millo, E., Gojon, Alain, Garcia-Agustin, P. (2007). Ammonium transport and CitAMT1 expression are regulated by light and sucrose in Citrus plants. Journal of experimental botany, 58(11), 2811-2825.
dc.description.abstractHere 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 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.
dc.titleAmmonium transport and CitAMT1 expression are regulated by light and sucrose in Citrus plants
dc.authorAddressInstituto Valenciano de Investigaciones Agrarias (IVIA), Carretera CV-315, Km. 10’7, 46113 Moncada (Valencia), Españaes 2007
dc.entidadIVIACentro de Citricultura y Producción Vegetal
dc.journal.titleJournal of experimental botany

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