These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Photoperiod-regulated expression of the PpCOL1 gene encoding a homolog of CO/COL proteins in the moss Physcomitrella patens.
    Author: Shimizu M, Ichikawa K, Aoki S.
    Journal: Biochem Biophys Res Commun; 2004 Nov 26; 324(4):1296-301. PubMed ID: 15504355.
    Abstract:
    The CONSTANS (CO) protein is a critical regulator of the photoperiodic control of flowering in Arabidopsis thaliana and Oryza sativa. We isolated a cDNA PpCOL1 encoding a homolog of the CO/CO-LIKE (COL) family proteins from a cryptogam Physcomitrella patens. The predicted PpCOL1 protein has N-terminal zinc finger and C-terminal CCT domains, which are conserved in the angiosperm CO/COL proteins. Structurally, PpCOL1 is the most closely related to the Group Ia or Ic proteins, which include AtCO and AtCOL1/2, among diverged members of the family. A transient expression assay using GFP showed that the CCT domain of PpCOL1 contains a nuclear-localizing signal. Northern blotting analyses revealed that the PpCOL1 expression is controlled by the circadian clock, and moreover, it is photoperiodically regulated at a gametophore stage when the rate of sporophyte formation is affected by day length. These observations indicate a possible involvement of PpCOL1 as a nuclear factor in the photoperiodic regulation of reproduction of Physcomitrella.
    [Abstract] [Full Text] [Related] [New Search]