title: (1)O2-mediated retrograde signaling during late embryogenesis predetermines plastid differentiation in seedlings by recruiting abscisic acid.
abstract: 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.
authors.affiliation: Institute of Plant Sciences, Swiss Federal Institute of Technology (ETH), CH-8092 Zurich, Switzerland.
authors.forename: Chanhong
authors.initials: C
authors.lastname: Kim
authors.forename: Keun Pyo
authors.initials: KP
authors.lastname: Lee
authors.forename: Aiswarya
authors.initials: A
authors.lastname: Baruah
authors.forename: Mena
authors.initials: M
authors.lastname: Nater
authors.forename: Cornelia
authors.initials: C
authors.lastname: Göbel
authors.forename: Ivo
authors.initials: I
authors.lastname: Feussner
authors.forename: Klaus
authors.initials: K
authors.lastname: Apel
mesh_terms: D000040:Abscisic Acid / Q000502:physiology*; D017360:Arabidopsis / Q000196:embryology*; D010100:Oxygen / Q000378:metabolism*; D018087:Plastids; D012639:Seeds / Q000254:growth & development*; D015398:Signal Transduction
chemical_list: D000040:Abscisic Acid; D010100:Oxygen