RSF1, an Arabidopsis locus implicated in phytochrome A signaling

Plant Physiol. 2000 Sep;124(1):39-45. doi: 10.1104/pp.124.1.39.


In Arabidopsis, phytochrome A (phyA) is the major photoreceptor both for high irradiance responses to far-red light and broad spectrum very low fluence responses, but little is known of its signaling pathway(s). rsf1 was isolated as a recessive mutant with reduced sensitivity to far-red inhibition of hypocotyl elongation. At the seedling stage rsf1 mutants are affected, to various degrees, in all described phyA-mediated responses. However, in adult rsf1 plants, the photoperiodic flowering response is normal. The rsf1 mutant has wild-type levels of phyA suggesting that RSF1 is required for phyA signaling rather than phyA stability or biosynthesis. RSF1 thus appears to be a major phyA signaling component in seedlings, but not in adult, Arabidopsis plants.

Publication types

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

MeSH terms

  • Arabidopsis / genetics*
  • Arabidopsis / growth & development
  • Arabidopsis / physiology
  • Arabidopsis Proteins
  • Electrophoresis, Polyacrylamide Gel
  • Light*
  • Mutation
  • Photoreceptor Cells*
  • Phytochrome / genetics*
  • Phytochrome / metabolism
  • Phytochrome A
  • Phytochrome B
  • Signal Transduction*
  • Transcription Factors*


  • Arabidopsis Proteins
  • PHYA protein, Arabidopsis
  • PHYB protein, Arabidopsis
  • Phytochrome A
  • Transcription Factors
  • Phytochrome
  • Phytochrome B