Rhythmic growth explained by coincidence between internal and external cues.

Détails

ID Serval
serval:BIB_F2A7341D2AC2
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Rhythmic growth explained by coincidence between internal and external cues.
Périodique
Nature
Auteur(s)
Nozue K., Covington M.F., Duek P.D., Lorrain S., Fankhauser C., Harmer S.L., Maloof J.N.
ISSN
1476-4687[electronic], 0028-0836[linking]
Statut éditorial
Publié
Date de publication
2007
Peer-reviewed
Oui
Volume
448
Numéro
7151
Pages
358-361
Langue
anglais
Résumé
Most organisms use circadian oscillators to coordinate physiological and developmental processes such as growth with predictable daily environmental changes like sunrise and sunset. The importance of such coordination is highlighted by studies showing that circadian dysfunction causes reduced fitness in bacteria and plants, as well as sleep and psychological disorders in humans. Plant cell growth requires energy and water-factors that oscillate owing to diurnal environmental changes. Indeed, two important factors controlling stem growth are the internal circadian oscillator and external light levels. However, most circadian studies have been performed in constant conditions, precluding mechanistic study of interactions between the clock and diurnal variation in the environment. Studies of stem elongation in diurnal conditions have revealed complex growth patterns, but no mechanism has been described. Here we show that the growth phase of Arabidopsis seedlings in diurnal light conditions is shifted 8-12 h relative to plants in continuous light, and we describe a mechanism underlying this environmental response. We find that the clock regulates transcript levels of two basic helix-loop-helix genes, phytochrome-interacting factor 4 (PIF4) and PIF5, whereas light regulates their protein abundance. These genes function as positive growth regulators; the coincidence of high transcript levels (by the clock) and protein accumulation (in the dark) allows them to promote plant growth at the end of the night. Thus, these two genes integrate clock and light signalling, and their coordinated regulation explains the observed diurnal growth rhythms. This interaction may serve as a paradigm for understanding how endogenous and environmental signals cooperate to control other processes.
Mots-clé
Arabidopsis/genetics, Arabidopsis/growth & development, Arabidopsis Proteins/genetics, Arabidopsis Proteins/metabolism, Biological Clocks/physiology, Biological Clocks/radiation effects, Circadian Rhythm/physiology, Circadian Rhythm/radiation effects, Cues, Darkness, Gene Expression Regulation, Plant, Genes, Plant/genetics, Hypocotyl/genetics, Hypocotyl/growth & development, Light, Mutation/genetics, Seedling/genetics, Seedling/growth & development, Time Factors
Pubmed
Web of science
Création de la notice
24/01/2008 16:29
Dernière modification de la notice
03/03/2018 22:40
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