title: Long-distance transport of endogenous gibberellins in Arabidopsis.
abstract: Gibberellins (GAs) are phytohormones controlling major aspects of plant growth and development. Although previous studies suggested the existence of a transport of GAs in plants, the nature and properties associated with this transport were unknown. We recently showed through micrografting and biochemical approaches that the GA12 precursor is the chemical form of GA undergoing long-distance transport across plant organs in Arabidopsis. Endogenous GA12 moves through the plant vascular system from production sites to recipient tissues, in which GA12 can be converted to bioactive forms to support growth via the activation of GA-dependent processes. GAs are also essential to promote seed germination; hence GA biosynthesis mutants do not germinate without exogenous GA treatment. Our results suggest that endogenous GAs are not (or not sufficiently) transmitted to the offspring to successfully complete the germination under permissive conditions.
authors.affiliation: a Institut de Biologie Moléculaire des Plantes; Université de Strasbourg ; Strasbourg , France.|b Current address: Department of Plant Systems Biology ; Freising , Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Regnault
authors.affiliation: a Institut de Biologie Moléculaire des Plantes; Université de Strasbourg ; Strasbourg , France.
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Davière
authors.affiliation: a Institut de Biologie Moléculaire des Plantes; Université de Strasbourg ; Strasbourg , France.
authors.forename: Patrick
authors.initials: P
authors.lastname: Achard
mesh_terms: D017360:Arabidopsis / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D001692:Biological Transport / Q000187:drug effects; D018525:Germination / Q000187:drug effects; D005875:Gibberellins / Q000378:metabolism* / Q000494:pharmacology; D012639:Seeds / Q000187:drug effects / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects
chemical_list: D005875:Gibberellins
keywords: Arabidopsis thaliana; gibberellin; grafting; growth; offspring; seed germination; transport; vascular system