PMID: 11912238Mar 26, 2002Paper

Steps towards an integrated view of nitrogen metabolism

Journal of Experimental Botany
Mark StittAnne Krapp

Abstract

This article discusses how nitrate assimilation is integrated with nitrate uptake, with ammonium assimilation and amino acid synthesis, with pH regulation, and with the sugar supply in tobacco leaves. During the first part of the light period, nitrate assimilation exceeds nitrate uptake by 2-fold and ammonium assimilation by 50%, leading to rapid depletion of nitrate and accumulation of ammonium, glutamine, glycine and serine. NIA, NII and PPC expression show a shared maximum early in the diurnal cycle to direct carbon towards malate synthesis for pH regulation. Later in the diurnal cycle an orchestrated increase of GLN2, PKc, CS, and ICDH-1 expression re-establishes a balance between nitrate assimilation and ammonium metabolism. Nitrate uptake continues throughout the night, replenishing the leaf nitrate pool. These diurnal changes are attenuated or abolished in mutants with low NIA activity, and modified in wild-type plants growing on different nitrogen sources or elevated [CO(2)]. Comparison across genotypes and conditions reveals that NIA transcript levels are always closely related to the balance between nitrate influx and assimilation, but are unrelated to changes of glutamine or 2-oxoglutarate. In a systematic search for...Continue Reading

Citations

May 27, 2011·Plant Molecular Biology·Shuang HaoWeilun Yin
Oct 24, 2012·Biological Trace Element Research·Guangrong HuangQing Zhou
Jul 1, 2008·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Ahmad AliNandula Raghuram
Mar 9, 2004·Trends in Plant Science·Nicolas Bouché, Hillel Fromm
May 20, 2003·Current Opinion in Plant Biology·John E Lunn, Elspeth MacRae
May 20, 2003·Current Opinion in Plant Biology·Thomas J Buckhout, Oliver Thimm
Oct 9, 2002·The Plant Journal : for Cell and Molecular Biology·Thomas RademacherChristoph Peterhänsel
Jan 1, 2003·Journal of Experimental Botany·Christine H FoyerGraham Noctor
Apr 10, 2004·Journal of Experimental Botany·Anne M Borland, Tahar Taybi
Jan 12, 2011·Journal of Experimental Botany·Miyako KusanoKazuki Saito
May 18, 2013·Journal of Experimental Botany·Saad SuliemanLam-Son Phan Tran
Jan 18, 2013·Plant & Cell Physiology·Naoya SawakiShuichi Yanagisawa
Jan 25, 2005·Plant Physiology·David González-BallesterEmilio Fernández
Dec 17, 2009·Plant Physiology·Manpreet S KatariRodrigo A Gutiérrez

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