Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 106, Issue 24, Pages 9920-9924Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0901315106
Keywords
O-1(2) signaling; seed development
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Funding
- Swiss National Science Foundation, ETH-Zurich
- Functional Genomic Center Zurich
- Boyce Thompson Institute for Plant Research
- German Research Council
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Plastid development in seedlings of Arabidopsis thaliana is affected by the transfer of O-1(2)-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 O-1(2)-mediated retrograde signaling before the onset of dormancy and impairs normal plastid formation in germinating seeds. This long-term effect of O-1(2) 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.
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