AOBPreview originally published online on March 31, 2005
Annals of Botany 2005 95(7):1187-1198; doi:10.1093/aob/mci131
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Dynamics of Nitrogen Uptake and Mobilization in Field-grown Winter Oilseed Rape (Brassica napus) From Stem Extension to Harvest. II. An 15N-labelling-based Simulation Model of N Partitioning Between Vegetative and Reproductive Tissues
UMR INRA-UCBN 950 EVA, Ecophysiologie Végétale, Agronomie et Nutritions N, C, S. Institut de Biologie Fondamentale et Appliquée, Université de Caen Basse Normandie, 14032 Caen Cedex, France
* For correspondence. E-mail ourry{at}ibfa.unicaen.fr
Received: 16 June 2004 Returned for revision: 8 September 2004 Accepted: 16 February 2005 Published electronically: 31 March 2005
• Background and Aims Oilseed rape (Brassica napus) has often been used as a catch crop to deal with the issue of N leaching, but for this to be effective, prediction of the crop's N uptake capability and N partitioning is required. The aim of this work was to build a compartmental model of N dynamics in oilseed rape, based on the kinetic description of N uptake, partitioning and mobilization in each organ.
• Model In this study, logistic and exponential equations were fitted to the N relations of each compartment, especially the leaf at each node. Data previously obtained from an 15N-labelling field experiment was used to quantify the partitioning of total N content, the allocation of N taken up and subsequent changes in the sink/source status for endogenous N in each tissue throughout the growth cycle.
• Key Results and Conclusions This modelling approach provides a unique tool for the quantitative estimation of cycling of endogenous N in relation to changes in N uptake at the whole-plant level. Furthermore, as oilseed rape is known to release large amounts of N to the soil during spring through leaf loss, this model was used to identify potential methods for improving the N harvest index of the crop. Simulations showed that N content or yield could be improved by 15 % by optimizing N transfer from vegetative to reproductive tissues and by reducing the residual %N (DW) in abscised leaves.
Key words: Brassica napus L., field conditions, 15N labelling, N uptake, N dynamics, mobilization, cycling N pool, modelling
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