title: Putative involvement of Thioredoxin h in early response to gravitropic stimulation of poplar stems.
abstract: Gravity perception and gravitropic response are essential for plant development. In herbaceous species, it is widely accepted that one of the primary events in gravity perception involves the displacement of amyloplasts within specialized cells. However, the early signaling events leading to stem reorientation are not fully known, especially in woody species in which primary and secondary growth occur. Thirty-six percent of the identified proteins that were differentially expressed after gravistimulation were established as potential Thioredoxin targets. In addition, Thioredoxin h expression was induced following gravistimulation. In situ immunolocalization indicated that Thioredoxin h protein co-localized with the amyloplasts located in the endodermal cells. These investigations suggest the involvement of Thioredoxin h in the first events of signal transduction in inclined poplar stems, leading to reaction wood formation.
authors: Laboratoire de Biologie et Physiologie Végétales, Département de Biologie, Faculté des Sciences de Tunis, campus universitaire, 1060, Tunis, Tunisia. azwassim@yahoo.fr
authors: Wassim
authors: W
authors: Azri
authors: Nicole
authors: N
authors: Brunel
authors: Jérôme
authors: J
authors: Franchel
authors: Ichrak
authors: I
authors: Ben Rejeb
authors: Jean-Pierre
authors: JP
authors: Jacquot
authors: Jean-Louis
authors: JL
authors: Julien
authors: Stéphane
authors: S
authors: Herbette
authors: Patricia
authors: P
authors: Roeckel-Drevet
mesh_terms: D006112:Gravitation; D018522:Gravitropism / Q000502:physiology*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D018547:Plant Stems / Q000502:physiology*; D018087:Plastids / Q000502:physiology; D032107:Populus / Q000166:cytology / Q000502:physiology*; D018749:RNA, Plant / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D054480:Thioredoxin h / Q000235:genetics / Q000378:metabolism*; D013997:Time Factors
chemical_list: D010940:Plant Proteins; D018749:RNA, Plant; D054480:Thioredoxin h