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

Hersh, Micha ; Lorrain, Séverine ; de Wit, Mieke ; Trevisan, Martine ; Ljung, Karin ; Bergmann, Sven ; Frankhauser, Christian

Proceedings of the National Academy of Sciences - PNAS, 2014-04, Vol.111 (17), p.6515-6520 [Periódico revisado por pares]

United States: National Academy of Sciences

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Título:
Light intensity modulates the regulatory network of the shade avoidance response in Arabidopsis
Autor: Hersh, Micha ; Lorrain, Séverine ; de Wit, Mieke ; Trevisan, Martine ; Ljung, Karin ; Bergmann, Sven ; Frankhauser, Christian
Assuntos: Arabidopsis - drug effects ; Arabidopsis - genetics ; Arabidopsis - physiology ; Arabidopsis - radiation effects ; Arabidopsis Proteins - genetics ; Arabidopsis Proteins - metabolism ; Auxins ; Biochemistry and Molecular Biology ; Biokemi och molekylärbiologi ; Biological Sciences ; Biosynthesis ; Botanik ; Botany ; Flowers & plants ; Gene Regulatory Networks - drug effects ; Gene Regulatory Networks - radiation effects ; Hormones ; Hypocotyls ; Indoleacetic Acids - pharmacology ; Light ; Luminous intensity ; Modeling ; Models, Biological ; Photobiology ; Photochemistry ; Plant growth ; Plants ; Seedlings ; Seedlings - drug effects ; Seedlings - growth & development ; Seedlings - radiation effects ; Signal transduction ; Tradeoffs ; Vegetation canopies
É parte de: Proceedings of the National Academy of Sciences - PNAS, 2014-04, Vol.111 (17), p.6515-6520
Notas: http://dx.doi.org/10.1073/pnas.1320355111
Author contributions: M.H., S.L., M.d.W., S.B., and C.F. designed research; M.H., S.L., M.d.W., M.T., and K.L. performed research; M.H., S.L., M.d.W., M.T., K.L., S.B., and C.F. analyzed data; and M.H., S.L., and C.F. wrote the paper.
1M.H. and S.L. contributed equally to this work and are listed in alphabetical order.
Edited by Mark Estelle, University of California, San Diego, La Jolla, CA, and approved March 25, 2014 (received for review October 29, 2013)
Descrição: 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.
Editor: United States: National Academy of Sciences
Idioma: Inglês

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

Hersh, Micha ; Lorrain, Séverine ; de Wit, Mieke ; Trevisan, Martine ; Ljung, Karin ; Bergmann, Sven ; Frankhauser, Christian

United States: National Academy of Sciences

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