An anionic class III peroxidase from zucchini may regulate hypocotyl elongation through its auxin oxidase activity.

Planta
Claudia CosioChristophe Dunand

Abstract

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.

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Citations

Apr 1, 2014·Plant Physiology and Biochemistry : PPB·Xueyan ZhaoXia Cai
Nov 7, 2015·The New Phytologist·Jun Shigeto, Yuji Tsutsumi
Jan 22, 2014·Physiologia Plantarum·Pedro AraújoPaulo Mazzafera
Aug 12, 2014·Phytochemistry·Edith FrancozChristophe Dunand
Oct 13, 2016·Frontiers in Plant Science·Rachana SinghSheo M Prasad
Aug 7, 2009·Molecular Plant-microbe Interactions : MPMI·Ester SimonettiIsidoro López-Braña
Aug 3, 2019·International Journal of Molecular Sciences·Ting JinYan Li
Jun 15, 2018·Frontiers in Plant Science·Ana L C SoaresSebastien C Carpentier
Jul 6, 2017·International Journal of Molecular Sciences·Agnieszka BielachVanesa B Tognetti
Jan 26, 2021·IScience·Ali EljebbawiJosé Manuel Estevez
Oct 19, 2021·Frontiers in Plant Science·Leonard Blaschek, Edouard Pesquet

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