O₂-mediated retrograde signaling during late embryogenesis predetermines plastid differentiation in seedlings by recruiting abscisic acid

Plastid development in seedlings of Arabidopsis thaliana is affected by the transfer of ¹O₂-mediated retrograde signals from the plastid to the nucleus and changes in nuclear gene expression during late embryogenesis. The potential impact of these mechanisms on plastid differentiation is maintained...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2009-06, Vol.106 (24), p.9920-9924
Main Authors: Kim, Chanhong, Lee, Keun Pyo, Baruah, Aiswarya, Nater, Mena, Göbel, Cornelia, Feussner, Ivo, Apel, Klaus
Format: Article
Language:English
Subjects:
abscisic acid
Abscisic Acid - physiology
Arabidopsis - embryology
Arabidopsis thaliana
cell differentiation
Chloroplasts
Cotyledons
Developmental biology
Embryogenesis
Genes
Immatures
oxygen
Oxygen - metabolism
Plants
Plastids
Seed development
Seedlings
Seeds - growth & development
Signal Transduction
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Summary:Plastid development in seedlings of Arabidopsis thaliana is affected by the transfer of ¹O₂-mediated retrograde signals from the plastid to the nucleus and changes in nuclear gene expression during late embryogenesis. The potential impact of these mechanisms on plastid differentiation is maintained throughout seed dormancy and becomes effective only after seed germination. Inactivation of the 2 nuclear-encoded plastid proteins EXECUTER1 and EXECUTER2 blocks ¹O₂-mediated retrograde signaling before the onset of dormancy and impairs normal plastid formation in germinating seeds. This long-term effect of ¹O₂ retrograde signaling depends on the recruitment of abscisic acid (ABA) during seedling development. Unexpectedly, ABA acts as a positive regulator of plastid formation in etiolated and light-grown seedlings.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.0901315106