A dynamic balance between gene activation and repression regulates the shade avoidance response in Arabidopsis

Article Abstract:

Plants grown under dense canopies perceive through the phytochrome system a reduction in the ratio of red to far-red light as a warning of competition, and this triggers a series of morphological changes to avoid shade. Several phytochrome signaling intermediates acting as positive regulators of accelerated elongation growth and induction of flowering in shade avoidance were identified and a negative regulatory mechanism ensures that in the presence of far-red-rich light an exaggerated plant response does not occur.

Science & research

---

The FAR1 (ital) locus encodes a novel nuclear protein specific to phytochrome A signaling

Article Abstract:

The FAR1 (ital) locus, which encodes a novel nuclear protein specific to phytochrome A signaling, is discussed. Using Arabidopsis, FRc-specific loss-of-signal-transmission mutants have been studied to characterize potentially positively acting components of phyA signaling. The Arabidopsis mutant is far1 (ital) (far-red-impaired response) with reduced responsiveness to continuous far-red light.

Statistical Data Included, Plants, Cellular signal transduction, Genetic regulation, Physiological regulation, Biological control systems, Photomorphogenesis

---

Canopy shade causes a rapid and transient arrest in leaf development through auxin-induced cytokinin oxidaes activity

Article Abstract:

The same low red/far-red (R/FR) signal induces hypocotyl elongation also triggers a rapid arrest of leaf primordium growth is reported. Results demonstrate the existence of a previously unrecognized regulatory circuit underlying plant response to canopy shade.

Analysis, Plant population genetics, Cytokinins

Similar abstracts:

• Abstracts: Hybrids between cultivated and wild carrots in natural populations in Denmark. Multinucleate storage cells in Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) and the effect of seed parasitism by the chalcid Megastigmus spermontrophus Wachtl
• Abstracts: Translational repression of C. elegans p53 by GLD-1 regulates DNA damage-induced apoptosis. Mule/ARF-BP1, a BH3-only E3 ubiquitin ligase, catalyzes the polyubiquitination of Mcl-1 and regulates apoptosis
• Abstracts: The Homeodomain transcription factor Irx5 establishes the mouse cardiac ventricular repolarization gradient. Homeobox galore: When reproduction goes RHOX and Roll
• Abstracts: The mammalian Mre11-Rad50-Nbs1 protein complex: integration of functions in the cellular DNA-damage response. Molecular cross-talk among chromosome fragility syndromes
• Abstracts: Identification and validation of oncogenes in liver cancer using an integrative oncogenomic approach. Principles of tumor suppression

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.