PMID: 11912231Mar 26, 2002Paper

The regulation of ammonium translocation in plants

Journal of Experimental Botany
Jan K SchjoerringMarie Mattsson

Abstract

Much controversy exists about whether or not NH(+)(4) is translocated in the xylem from roots to shoots. In this paper it is shown that such translocation can indeed take place, but that interference from other metabolites such as amino acids and amines may give rise to large uncertainties about the magnitude of xylem NH(+)(4) concentrations. Elimination of interference requires sample stabilization by, for instance, formic acid or methanol. Subsequent quantification of NH(+)(4) should be done by the OPA-fluorometric method at neutral pH with 2-mercaptoethanol as the reducing agent since this method is sensitive and reliable. Colorimetric methods based on the Berthelot reaction should never be used, as they are prone to give erroneous results. Significant concentrations of NH(+)(4), exceeding 1 mM, were measured in both xylem sap and leaf apoplastic solution of oilseed rape and tomato plants growing with NO(-)(3) as the sole N source. When NO(-)(3) was replaced by NH(+)(4), xylem sap NH(+)(4) concentrations increased with increasing external concentrations and with time of exposure to NH(+)(4). Up to 11% of the translocated N was constituted by NH(+)(4). Glutamine synthetase (GS) incorporates NH(+)(4) into glutamine, but root G...Continue Reading

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Citations

Jun 19, 2003·Isotopes in Environmental and Health Studies·P DijkstraB A Hungate
Sep 13, 2011·Journal of Experimental Botany·Robert P WalkerFranco Famiani
Jun 7, 2013·Journal of Experimental Botany·Liang WangJan K Schjoerring
Nov 23, 2006·Plant Physiology·Matthew Peter Purnell, José Ramon Botella
Aug 31, 2010·BMC Microbiology·José F da Silva NetoMarilis V Marques
Feb 4, 2014·Journal of Plant Physiology·Igor SetiénMaría Begoña González-Moro
Mar 15, 2013·Journal of Plant Physiology·Igor SetiénJosé María Estavillo
Feb 22, 2011·Journal of Plant Physiology·Cassia Ayumi Takahashi, Helenice Mercier
May 9, 2007·Journal of Plant Physiology·Xana Melissa Belastegui-MacadamCarmen Gónzalez-Murua
Jun 30, 2009·Plant, Cell & Environment·Trevor GarnettBrent N Kaiser
Mar 6, 2007·The New Phytologist·Jérémy CouturierMichel Chalot
May 23, 2012·Plant Biotechnology Journal·Chandra H McAllisterAllen G Good
Jan 11, 2011·Environmental Pollution·Carly J StevensEdu Dorland
Mar 13, 2015·Plant Signaling & Behavior·Soichi KojimaTomoyuki Yamaya
Dec 23, 2016·Journal of Experimental Botany·Takushi Hachiya, Hitoshi Sakakibara
Dec 23, 2016·Journal of Experimental Botany·Noriyuki KonishiSoichi Kojima
Aug 31, 2018·Frontiers in Plant Science·Jinlong DongZengqiang Duan
May 1, 2006·Functional Plant Biology : FPB·Amy E ZanneColin M Orians
Apr 21, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Sebastian SchrammWilfried Rozhon
Oct 1, 2015·Functional Plant Biology : FPB·Trevor GarnettMamoru Okamoto
Dec 15, 2020·Fungal Genetics and Biology : FG & B·Elena FantozziGero Steinberg
Mar 27, 2018·Plant Science : an International Journal of Experimental Plant Biology·Benjamin A Babst, Gary D Coleman

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