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

Publication Overview
TitleAmmonium transport and CitAMT1 expression are regulated by light and sucrose in Citrus plants
AuthorsCamañes G, Cerezo M, Primo-Millo E, Gojon A, García-Agustín P
TypeJournal Article
Journal NameJournal of experimental botany
Volume58
Issue11
Year2007
Page(s)2811-2825
CitationCamañes G, Cerezo M, Primo-Millo E, Gojon A, García-Agustín P. Ammonium transport and CitAMT1 expression are regulated by light and sucrose in Citrus plants. Journal of experimental botany. 2007; 58(11):2811-2825.

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 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.
Stocks
This publication contains information about 3 stocks:
Stock NameUniquenameType
Citrus sinensis L. OsbeckCitrus sinensis L. Osbeckaccession
TroyerTroyeraccession
Poncirus trifoliataPoncirus trifoliataaccession
Features
This publication contains information about 5 features:
Feature NameUniquenameType
DQ887678DQ887678.2region
18S18Sgenetic_marker
AMTAMTgenetic_marker
AMT-FAMT-Fgenetic_marker
AMT-RAMT-Rgenetic_marker
Properties
Additional details for this publication include:
Property NameValue
Publication TypeJournal Article
Publication Date2007
Published Location|||
Language Abbreng
KeywordsCitrus sinensis, circadian rhythm, complementary DNA, diurnal variation, genes, photosynthesis, roots, shoots, sucrose
Cross References
This publication is also available in the following databases:
DatabaseAccession
AGL: USDA National Agricultural LibraryAGL:3955741
PMID: PubMedPMID:17615410