Local auxin production underlies a spatially restricted neighbor-detection response in <i>Arabidopsis</i>.

Détails

Ressource 1Télécharger: PNAS-2017-Michaud-7444-9.pdf (1065.74 [Ko])
Etat: Public
Version: Final published version
ID Serval
serval:BIB_E653216BF122
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Local auxin production underlies a spatially restricted neighbor-detection response in <i>Arabidopsis</i>.
Périodique
Proceedings of the National Academy of Sciences of the United States of America
Auteur(s)
Michaud O., Fiorucci A.S., Xenarios I., Fankhauser C.
ISSN
1091-6490 (Electronic)
ISSN-L
0027-8424
Statut éditorial
Publié
Date de publication
11/07/2017
Peer-reviewed
Oui
Volume
114
Numéro
28
Pages
7444-7449
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
Competition for light triggers numerous developmental adaptations known as the "shade-avoidance syndrome" (SAS). Important molecular events underlying specific SAS responses have been identified. However, in natural environments light is often heterogeneous, and it is currently unknown how shading affecting part of a plant leads to local responses. To study this question, we analyzed upwards leaf movement (hyponasty), a rapid adaptation to neighbor proximity, in <i>Arabidopsis</i> We show that manipulation of the light environment at the leaf tip triggers a hyponastic response that is restricted to the treated leaf. This response is mediated by auxin synthesized in the blade and transported to the petiole. Our results suggest that a strong auxin response in the vasculature of the treated leaf and auxin signaling in the epidermis mediate leaf elevation. Moreover, the analysis of an auxin-signaling mutant reveals signaling bifurcation in the control of petiole elongation versus hyponasty. Our work identifies a mechanism for a local shade response that may pertain to other plant adaptations to heterogeneous environments.
Mots-clé
Arabidopsis/physiology, Arabidopsis Proteins/metabolism, Cryptochromes/metabolism, Gene Expression Regulation, Plant, Indoleacetic Acids/metabolism, Light, Mutation, Peptides/chemistry, Plant Leaves/metabolism, Signal Transduction, PIF, auxin, hyponasty, neighbor detection, organ-specific response
Pubmed
Web of science
Open Access
Oui
Création de la notice
06/07/2017 16:45
Dernière modification de la notice
20/08/2019 16:09
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