Reference : An anionic class III peroxidase from zucchini may regulate hypocotyl elongation throu...
Scientific journals : Article
Life sciences : Biochemistry, biophysics & molecular biology
Life sciences : Phytobiology (plant sciences, forestry, mycology...)
http://hdl.handle.net/2268/3258
An anionic class III peroxidase from zucchini may regulate hypocotyl elongation through its auxin oxidase activity.
English
Cosio, Claudia [Université de Genève - UNIGE > > > > Biochimie et phisiologie végétales > >]
Vuillemin, Loic [Université de Genève - UNIGE > > > > Biochimie et physiologie végétales > >]
De Meyer, Mireille [Université de Genève - UNIGE > > > > Biochimie et physiologie végétales > >]
Kevers, Claire mailto [Université de Liège - ULg > Département des sciences de la vie > Biologie moléculaire et biotechnologie végétales >]
Penel, Claude [Université de Genève - UNIGE > > > Biochimie et physiologie végétales > > >]
Dunand, Christophe [Université de Genève - UNIGE > > > > Biochimie et physiologie végétales > >]
2009
Planta
Springer Science & Business Media B.V.
Yes (verified by ORBi)
International
0032-0935
New York
NY
[en] Auxin oxidase activity ; cell elangation ; cell wall ; pectin ; peroxidase
[en] The high number of peroxidase genes explains the description of numerous physiological functions and the fact that the in planta function of a single isoform has never been characterized yet. We analyzed in transgenic Arabidopsis thaliana the localization of a zucchini isoperoxidase (APRX), previously purified thanks to its pectin binding ability. We confirmed that the protein is localized near the cell wall, mainly produced in the elongation area of the hypocotyls and respond to exogenous auxin. In addition, the ectopic overexpression of APRX induced changes in growth pattern and a significant reduction of endogenous indole-3-acetic acid (IAA) level. In agreement with these observations APRX showed an elevated in vitro auxin oxidase activity. We propose that APRX participates in the negative feedback regulation of auxin level and consequently terminates the hypocotyl elongation process.
Researchers
http://hdl.handle.net/2268/3258
10.1007/s00425-008-0876-0

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