Nitric oxide acts at the crossroad between auxin and reactive oxygen species determining the outcome of root growth and development.

CORREA ARAGUNDE NATALIA; PARIS RAMIRO; FORESI NOELIA PAMELA; TERRILE MARIA CECILIA; CASALONGUÉ, CLAUDIA; LAMATTINA LORENZO

Gasotransmitters in Plants

Springer International Publishing

Año: 2016; p. 117 - 136

Nitric oxide (NO) appeared as a novel signal molecule in plants at theend of the twenty century. Since then, new discoveries on the participation ofNO in the regulation of plant biology have not stopped. One of the most yetintriguing aspects that are under strong investigation is the extension andscope of the NO involvement in the control of cell redox balance andhormone-regulated processes. In this chapter, we addressed both issuesconnecting root growth with the NO-mediated posttranslational modificationS-nitrosylation on the auxin receptor Transport Inhibitor Response 1 (TIR1) andon the antioxidant enzyme ascorbate peroxidase 1 (APX1). Auxin is probably thebest studied plant hormone influencing root growth and development. Even if thecomponents of the signaling cascade leading to the induction ofauxin-responsive genes have been elucidated, here we describe the last findingsexplaining the molecular mechanisms underlying the requirement of NO to get afull response to auxin stimulus.