Dissecting the phytochrome A-dependent signaling network in higher plants

Trends Plant Sci. 2003 Apr;8(4):172-8. doi: 10.1016/S1360-1385(03)00049-9.


Plants monitor their ambient light environment using a network of photoreceptors. In Arabidopsis, phytochrome A (phyA) is the primary photoreceptor responsible for perceiving and mediating various responses to far-red light. Several breakthroughs in understanding the signaling network mediating phyA-activated responses have been made in recent years. Here, we highlight several key advances: the demonstration that light regulates nuclear translocation of phyA and its associated kinase activity; the revelation of a transcriptional cascade controlling phyA-regulated gene expression; the detection of a direct interaction between phyA and a transcription factor; and the identification and characterization of many phyA-specific signaling intermediates, some of them suggesting the involvement of the ubiquitin-proteasome pathway.

Publication types

  • Research Support, U.S. Gov't, P.H.S.
  • Review

MeSH terms

  • Active Transport, Cell Nucleus
  • Arabidopsis Proteins
  • Gene Expression Regulation, Plant
  • Light
  • Phytochrome / metabolism*
  • Phytochrome A
  • Plant Cells
  • Plants / genetics
  • Plants / metabolism*
  • Signal Transduction*


  • Arabidopsis Proteins
  • PHYA protein, Arabidopsis
  • Phytochrome A
  • Phytochrome