Plant hormone signaling lightens up: integrators of light and hormones

Curr Opin Plant Biol. 2010 Oct;13(5):571-7. doi: 10.1016/j.pbi.2010.07.001. Epub 2010 Aug 23.


Light is an important environmental signal that regulates diverse growth and developmental processes in plants. In these light-regulated processes, multiple hormonal pathways are often modulated by light to mediate the developmental changes. Conversely, hormone levels in plants also serve as endogenous cues in influencing light responsiveness. Although interactions between light and hormone signaling pathways have long been observed, recent studies have advanced our understanding by identifying signaling integrators that connect the pathways. These integrators, namely PHYTOCHROME-INTERACTING FACTOR 3 (PIF3), PIF4, PIF3-LIKE 5 (PIL5)/PIF1 and LONG HYPOCOTYL 5 (HY5), are key light signaling components and they link light signals to the signaling of phytohormones, such as gibberellin (GA), abscisic acid (ABA), auxin and cytokinin, in regulating seedling photomorphogenesis and seed germination. This review focuses on these integrators in illustrating how light and hormone interact.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Review

MeSH terms

  • Arabidopsis / growth & development
  • Arabidopsis / metabolism
  • Arabidopsis Proteins / metabolism
  • Basic Helix-Loop-Helix Transcription Factors / metabolism
  • Basic-Leucine Zipper Transcription Factors / metabolism
  • Gene Expression Regulation, Plant
  • Germination
  • Gibberellins / metabolism
  • Light*
  • Nuclear Proteins / metabolism
  • Plant Growth Regulators / metabolism*
  • Seedlings / growth & development
  • Seedlings / metabolism
  • Signal Transduction*


  • Arabidopsis Proteins
  • Basic Helix-Loop-Helix Transcription Factors
  • Basic-Leucine Zipper Transcription Factors
  • Gibberellins
  • HY5 protein, Arabidopsis
  • Nuclear Proteins
  • PIF3 protein, Arabidopsis
  • PIF4 protein, Arabidopsis
  • PIF5 protein, Arabidopsis
  • PIL5 protein, Arabidopsis
  • Plant Growth Regulators