Full TGIF Record # 35205
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Author(s):Léon, Marie; Lainé, Philippe; Ourry, Alain; Boucaud, Jean
Author Affiliation:Laboratoire de Physiologie et de Biochimie Végétales, L.A.;INRA, Institut de Recherche en Biologie Appliquée Université, France; Corresponding author
Title:Increased uptake of native soil nitrogen by roots of Lolium multiflorum Lam. after nitrogen fertilization is explained by a stimulation of the uptake process itself
Source:Plant and Soil. Vol. 173, No. 2, June 1995, p. 197-203.
# of Pages:8
Publishing Information:Dordrecht, Netherlands: Kluwer Academic Publishers
Related Web URL:http://link.springer.com/article/10.1007/BF00011456
    Last checked: 10/14/2015
    Notes: Abstract only
Keywords:TIC Keywords: Nitrogen fertilization; Nitrogen efficiency; Lolium multiflorum; Nitrogen; Nitrogen retention
Abstract/Contents:"Plants fertilized with N usually take up more of the native N compared to unfertilized plants. This so-called priming effect has been frequently described but as yet no explanation involving changes in nitrate uptake rates by roots has been proposed. An experimental procedure was designed for the measurement of nitrate uptake rates by excised roots of plants grown in field conditions. Analysis of Lolium multiflorum Lam. shoots from fertilized (60kg₁₅N-KNO³ha₋₁), and from control plots (no N applied), showed higher uptake of native soil N (+ 18 kg N ha₋₁) in fertilized plants during the first two weeks. This was largely independent of biomass production and resulted in higher values of apparent fertilizer efficiency than real fertilizer efficiency as measured by ^D1^D5N labelling. A large increase in rates of nitrate uptake by exised roots occurred during the first 14 days following N fertilization. Uptake rates following fertilizer application increased by 62 and 51% in relation to control plants, respectively, 7 and 14 days after N application. This increase was partially explained by higher nitrate concentrations in the soil solution, but mainly by a stimulation of the uptake process itself. Both kinetic and quantitative arguments suggested that the priming effect following N fertilization could be linked to a stimulation of nitrate uptake by roots."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Léon, M., P. Lainé, A. Ourry, and J. Boucaud. 1995. Increased uptake of native soil nitrogen by roots of Lolium multiflorum Lam. after nitrogen fertilization is explained by a stimulation of the uptake process itself. Plant Soil. 173(2):p. 197-203.
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