Modeling Nitrogen Uptake in Oilseed Rape cv Capitol during a Growth Cycle Using Influx Kinetics of Root Nitrate Transport Systems and Field Experimental Data - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Plant Physiology Année : 2004

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

Résumé

The use of kinetic equations of NO 3 transport systems in oilseed rape (Brassica napus), determined by 15 NO 3 labeling under controlled conditions, combined with experimental field data from the INRA-Châlons rape database were used to model NO 3 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 NO 3 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.
Fichier principal
Vignette du fichier
Malagoli et al., 2004.pdf (230.33 Ko) Télécharger le fichier
Origine : Publication financée par une institution

Dates et versions

hal-01422742 , version 1 (26-12-2016)

Identifiants

Citer

Philippe P. Malagoli, Philippe Lainé, Erwan Le Deunff, Laurence Rossato, Bertrand Ney, et al.. Modeling Nitrogen Uptake in Oilseed Rape cv Capitol during a Growth Cycle Using Influx Kinetics of Root Nitrate Transport Systems and Field Experimental Data. Plant Physiology, 2004, 134 (1), pp.388 - 400. ⟨10.1104/pp.103.029538⟩. ⟨hal-01422742⟩
124 Consultations
101 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More