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Published on December 11, 2003; 10.1104/pp.103.029538

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Received July 4, 2003
Returned for revision August 31, 2003
Accepted August 31, 2003

Modeling Nitrogen uptake in Oilseed Rape cv Capitol during a Growth Cycle Using Influx Kinetics of Root Nitrate Transport Systems and Field Experimental Data

Philippe Malagoli , Philippe Lainé , Erwan Le Deunff , Laurence Rossato , Bertrand Ney , and Alain Ourry *

Unité Mixte de Recherche, Institut National de la Recherche Agronomique (INRA)-Université de Caen Basse-Normandie, 950 de Physiologie et Biochimie Végétales, IRBA, Université de Caen, 14032 Caen cedex, France (P.M., P.L., E.L.D., L.R., A.O.); and Unité Mixte de Recherche, INRA-Institute National Agronomique de Paris-Grignon (INA PG), Environnement et Grandes Cultures, 78850 Thiverval Grignon, France (B.N.)

* Corresponding author; email: ourry{at}ibba.unicaen.fr.

The use of kinetic equations of NO3- transport systems in oilseed rape (Brassica napus), determined by 15NO3- labeling under controlled conditions, combined with experimental field data from the INRA-Châlons rape database were used to model NO3- uptake during the plant growth cycle. The quantitative effects of different factors such as day/night cycle, ontogenetic stages, root temperature, photosynthetically active radiation, and soil nitrate availability on different components of the constitutive high-affinity transport systems, constitutive low-affinity transport systems, inducible low-affinity transport systems, and inducible high-affinity transport systems of nitrate were then determined to improve the model’s predictions. Simulated uptake correlated well with measured values of nitrogen (N) uptake under field conditions for all N fertilization rates tested. Model outputs showed that the high-affinity transport system accounted for about 89% of total NO3- uptake (18% and 71% for constitutive high-affinity transport systems and inducible high-affinity transport systems, respectively) when no fertilizer was applied. The low-affinity transport system accounted for a minor proportion of total N uptake, and its activity was restricted to the early phase of the growth cycle. However, N fertilization in spring increased the duration of its contribution to total N uptake. Overall, data show that this mechanistic and environmentally regulated approach is a powerful means to simulate total N uptake in the field with the advantage of taking both physiologically regulated processes at the overall plant level and specific nitrate transport system characteristics into account.




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