Journal
PLANT MOLECULAR BIOLOGY
Volume 69, Issue 4, Pages 463-472Publisher
SPRINGER
DOI: 10.1007/s11103-008-9429-y
Keywords
Abscisic acid; Gibberellin; Phytochrome; Seed germination
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Funding
- Korea Science and Engineering Foundation [R0A-2007-000-20024-0]
- Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research [20570049]
- National Research Foundation of Korea [2007-0056949, R0A-2007-000-20024-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Grants-in-Aid for Scientific Research [20570049] Funding Source: KAKEN
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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.
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