Light intensity modulates the regulatory network of the shade avoidance response in Arabidopsis.

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Ressource 1Télécharger: BIB_C2C0FA03AEFA.P001.pdf (5733.57 [Ko])
Etat: Serval
Version: Author's accepted manuscript
ID Serval
serval:BIB_C2C0FA03AEFA
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Light intensity modulates the regulatory network of the shade avoidance response in Arabidopsis.
Périodique
Proceedings of the National Academy of Sciences of the United States of America
Auteur(s)
Hersch M., Lorrain S., de Wit M., Trevisan M., Ljung K., Bergmann S., Fankhauser C.
ISSN
1091-6490 (Electronic)
ISSN-L
0027-8424
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
111
Numéro
17
Pages
6515-6520
Langue
anglais
Résumé
Plants such as Arabidopsis thaliana respond to foliar shade and neighbors who may become competitors for light resources by elongation growth to secure access to unfiltered sunlight. Challenges faced during this shade avoidance response (SAR) are different under a light-absorbing canopy and during neighbor detection where light remains abundant. In both situations, elongation growth depends on auxin and transcription factors of the phytochrome interacting factor (PIF) class. Using a computational modeling approach to study the SAR regulatory network, we identify and experimentally validate a previously unidentified role for long hypocotyl in far red 1, a negative regulator of the PIFs. Moreover, we find that during neighbor detection, growth is promoted primarily by the production of auxin. In contrast, in true shade, the system operates with less auxin but with an increased sensitivity to the hormonal signal. Our data suggest that this latter signal is less robust, which may reflect a cost-to-robustness tradeoff, a system trait long recognized by engineers and forming the basis of information theory.
Pubmed
Web of science
Open Access
Oui
Création de la notice
23/05/2014 10:08
Dernière modification de la notice
09/05/2019 0:51
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