The protein phosphatase 7 regulates phytochrome signaling in Arabidopsis.

Détails

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Etat: Public
Version: de l'auteur
ID Serval
serval:BIB_022C07781FE9
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
The protein phosphatase 7 regulates phytochrome signaling in Arabidopsis.
Périodique
PloS one
Auteur(s)
Genoud T., Santa Cruz M.T., Kulisic T., Sparla F., Fankhauser C., Métraux J.P.
ISSN
1932-6203[electronic]
Statut éditorial
Publié
Date de publication
2008
Peer-reviewed
Oui
Volume
3
Numéro
7
Pages
e2699
Langue
anglais
Résumé
The psi2 mutant of Arabidopsis displays amplification of the responses controlled by the red/far red light photoreceptors phytochrome A (phyA) and phytochrome B (phyB) but no apparent defect in blue light perception. We found that loss-of-function alleles of the protein phosphatase 7 (AtPP7) are responsible for the light hypersensitivity in psi2 demonstrating that AtPP7 controls the levels of phytochrome signaling. Plants expressing reduced levels of AtPP7 mRNA display reduced blue-light induced cryptochrome signaling but no noticeable deficiency in phytochrome signaling. Our genetic analysis suggests that phytochrome signaling is enhanced in the AtPP7 loss of function alleles, including in blue light, which masks the reduced cryptochrome signaling. AtPP7 has been found to interact both in yeast and in planta assays with nucleotide-diphosphate kinase 2 (NDPK2), a positive regulator of phytochrome signals. Analysis of ndpk2-psi2 double mutants suggests that NDPK2 plays a critical role in the AtPP7 regulation of the phytochrome pathway and identifies NDPK2 as an upstream element involved in the modulation of the salicylic acid (SA)-dependent defense pathway by light. Thus, cryptochrome- and phytochrome-specific light signals synchronously control their relative contribution to the regulation of plant development. Interestingly, PP7 and NDPK are also components of animal light signaling systems.
Mots-clé
Alleles, Arabidopsis/metabolism, Cloning, Molecular, DNA, Complementary/metabolism, Epistasis, Genetic, Gene Expression Regulation, Plant, Genetic Complementation Test, Light, Models, Biological, Mutation, Nucleoside-Diphosphate Kinase/metabolism, Phosphoprotein Phosphatases/chemistry, Phosphoprotein Phosphatases/genetics, Phytochrome/chemistry, Salicylic Acid/metabolism, Signal Transduction
Pubmed
Web of science
Open Access
Oui
Création de la notice
15/06/2009 14:28
Dernière modification de la notice
20/08/2019 13:24
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