Plant Molecular Biology

, 69:463

Interaction of light and hormone signals in germinating seeds

  • Mitsunori Seo
  • Eiji Nambara
  • Giltsu Choi
  • Shinjiro Yamaguchi
Article

Abstract

Seed germination is regulated by several environmental factors, such as moisture, oxygen, temperature, light, and nutrients. Light is a critical regulator of seed germination in small-seeded plants, including Arabidopsis and lettuce. Phytochromes, a class of photoreceptors, play a major role in perceiving light to induce seed germination. Classical physiological studies have long suggested the involvement of gibberellin (GA) and abscisic acid (ABA) in the phytochrome-mediated germination response. Recent studies have demonstrated that phytochromes modulate endogenous levels of GA and ABA, as well as GA responsiveness. Several key components that link the perception of light and the modulation of hormone levels and responsiveness have been identified. Complex regulatory loops between light, GA and ABA signaling pathways have been uncovered.

Keywords

Abscisic acid Gibberellin Phytochrome Seed germination 

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Mitsunori Seo
    • 1
  • Eiji Nambara
    • 2
  • Giltsu Choi
    • 3
  • Shinjiro Yamaguchi
    • 1
  1. 1.RIKEN Plant Science CenterYokohama, KanagawaJapan
  2. 2.Department of Cell & Systems BiologyUniversity of TorontoTorontoCanada
  3. 3.Department of Biological SciencesKAISTDaejeonKorea

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