Abstract:
:Root system architecture adapts to low nitrogen (N) nutrition. Some adaptations may be mediated by modifications of carbon (C) fluxes. The objective of this study was to test the hypothesis that changes in root system architecture under different N regimes may be accounted for by using simple hypotheses of C allocation within the root system of Arabidopsis thaliana. With that purpose, a model during vegetative growth was developed that predicted the main traits of root system architecture (total root length, lateral root number, and specific root length). Different experimental data sets crossing three C levels and two N homogenous nutrition levels were generated. Parameters were estimated from an experiment carried out under medium C and high N conditions. They were then checked under other CxN conditions. It was found that the model was able to simulate correctly C effects on root architecture in both high and low N nutrition conditions, with the same parameter values. It was concluded that C flux modifications explained the major part of root system adaptation to N supply, even if they were not sufficient to simulate some changes, such as specific root length.
journal_name
J Exp Botjournal_title
Journal of experimental botanyauthors
Brun F,Richard-Molard C,Pagès L,Chelle M,Ney Bdoi
10.1093/jxb/erq090subject
Has Abstractpub_date
2010-05-01 00:00:00pages
2157-69issue
8eissn
0022-0957issn
1460-2431pii
erq090journal_volume
61pub_type
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