title: Effects of hypergravity conditions on elongation growth and lignin formation in the inflorescence stem of Arabidopsis thaliana.
abstract: The effects of hypergravity on elongation growth and lignin deposition in secondary cell walls of the Arabidopsis thaliana (L.) Heynh. inflorescence stem were examined in plants grown for 3 days after exposure to hypergravity in the direction from shoot to root at 300 g for 24 h. The content of acetylbromide-extractable lignins in a secondary cell wall fraction prepared by enzyme digestion of inflorescence stem segments removing primary cell wall components was significantly increased by the hypergravity stimulus. Xylem vessels, particularly in a region closer to the base of the inflorescence stem, increased in number. Gadolinium chloride at 0.1 mM, a blocker of mechanoreceptors, partially suppressed the effect of hypergravity on lignin deposition in the secondary cell wall fraction. These results suggest that mechanoreceptors are responsible for hypergravity-induced lignin deposition in secondary cell walls in A. thaliana inflorescence stems.
authors.affiliation: Department of Biology, Faculty of Science, Toyama University, Toyama 930-8555, Japan,
authors.forename: Daisuke
authors.initials: D
authors.lastname: Tamaoki
authors.forename: Ichirou
authors.initials: I
authors.lastname: Karahara
authors.forename: Lukas
authors.initials: L
authors.lastname: Schreiber
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Wakasugi
authors.forename: Kyoji
authors.initials: K
authors.lastname: Yamada
authors.forename: Seiichiro
authors.initials: S
authors.lastname: Kamisaka
mesh_terms: D017360:Arabidopsis / Q000254:growth & development*; D002473:Cell Wall; D035263:Flowering Tops / Q000254:growth & development*; D005682:Gadolinium; D018471:Hypergravity; D008031:Lignin / Q000096:biosynthesis*; D008465:Mechanoreceptors
chemical_list: D008031:Lignin; D005682:Gadolinium; C038958:gadolinium chloride