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

Malagoli, P, Laine, P, Rossato, L and Ourry, A (2005) 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. Annals of Botany, 95 7: 1187-1198. doi:10.1093/aob/mci131


Author Malagoli, P
Laine, P
Rossato, L
Ourry, A
Title 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
Formatted title
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
Journal name Annals of Botany   Check publisher's open access policy
ISSN 0305-7364
0003-4754
1095-8290
Publication date 2005
Sub-type Article (original research)
DOI 10.1093/aob/mci131
Volume 95
Issue 7
Start page 1187
End page 1198
Total pages 12
Place of publication Oxford, UK
Publisher Oxford University Press
Language eng
Subject 0607 Plant Biology
Abstract 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 N-15-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.
Keyword Plant Sciences
Brassica napus L.
field conditions
N-15 labelling
N uptake
N dynamics
mobilization
cycling N pool
modelling
Leaf Senescence
Seed Yield
Leaves
Crop
Remobilization
Demand
L.
Photosynthesis
Chlorophyll
Irrigation
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mechanical & Mining Engineering Publications
 
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Created: Wed, 17 Oct 2007, 13:38:47 EST