(1)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 (1)O(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 (1)O(2)-mediated retrograde signaling before the onset of dormancy and impairs normal plastid formation in germinating seeds. This long-term effect of (1)O(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.
Kim
Chanhong
C
Institute of Plant Sciences, Swiss Federal Institute of Technology (ETH), CH-8092 Zurich, Switzerland.
Lee
Keun Pyo
KP
Baruah
Aiswarya
A
Nater
Mena
M
Göbel
Cornelia
C
Feussner
Ivo
I
Apel
Klaus
K
D000040:Abscisic Acid / Q000502:physiology*; D017360:Arabidopsis / Q000196:embryology*; D010100:Oxygen / Q000378:metabolism*; D018087:Plastids; D012639:Seeds / Q000254:growth & development*; D015398:Signal Transduction
D000040:Abscisic Acid; D010100:Oxygen