Abstract
ABSTRACTThe circadian clock coordinates an organism’s growth, development and physiology with environmental factors. One illuminating example is the rhythmic growth of hypocotyls and cotyledons in Arabidopsis thaliana. Such daily oscillations in leaf position are often referred to as sleep movements or nyctinasty. Here, we report that plantlets of the liverwort Marchantia polymorpha show analogous rhythmic movements of thallus lobes, and that the circadian clock controls this rhythm, with auxin a likely meditator. The mechanisms of this circadian clock are partly conserved as compared to angiosperms, with homologs to the core clock genes PRR, RVE and TOC1 forming a core transcriptional feedback loop also in M. polymorpha.
Publisher
Cold Spring Harbor Laboratory
Reference41 articles.
1. [Physiologic 24-hour periodicity; general and procedural considerations with reference to the adrenal cycle];Int. Z. Vitaminforschung Beih.,1959
2. Pfeffer, W. Osmotische Untersuchungen: Studien zur Zellmechanik. (W. Engelmann, 1877).
3. Osmoregulation of leaf motor cells
4. Leaf Movement Rhythm In Arabidopsis thaliana;Z. Für Naturforschung C,1992
5. The plasma membrane aquaporin NtAQP1 is a key component of the leaf unfolding mechanism in tobacco;Plant J. Cell Mol. Biol.,2004