Plant proximity perception dynamically modulates hormone levels and sensitivity in Arabidopsis
Bou Torrent, Jordi (Centre de Recerca en Agrigenòmica)
Galstyan, Anahit (Centre de Recerca en Agrigenòmica)
Gallemí, Marçal (Centre de Recerca en Agrigenòmica)
Cifuentes-Esquivel, Nicolás (Centre de Recerca en Agrigenòmica)
Molina-Contreras, Maria José (Centre de Recerca en Agrigenòmica)
Salla-Martret, Mercè (Centre de Recerca en Agrigenòmica)
Jikumaru, Yusuke (RIKEN Plant Science Center)
Yamaguchi, Shinjiro (RIKEN Plant Science Center)
Kamiya, Yuji (RIKEN Plant Science Center)
Martínez García, Jaime F. (Centre de Recerca en Agrigenòmica)

Fecha:	2014
Resumen:	Shade perception involves altered hormone synthesis and sensitivity. Here, we showed that several shade regulators act as positive and negative modulators of the hypocotyl auxin and/or brassinosteroid-induced elongation. The s hade a voidance s yndrome (SAS) refers to a set of plant responses initiated after perception by the phytochromes of light enriched in far-red colour reflected from or filtered by neighbouring plants. These varied responses are aimed at anticipating eventual shading from potential competitor vegetation. In Arabidopsis thaliana, the most obvious SAS response at the seedling stage is the increase in hypocotyl elongation. Here, we describe how plant proximity perception rapidly and temporally alters the levels of not only auxins but also active brassinosteroids and gibberellins. At the same time, shade alters the seedling sensitivity to hormones. Plant proximity perception also involves dramatic changes in gene expression that rapidly result in a new balance between positive and negative factors in a network of interacting basic helix-loop-helix proteins, such as HFR1, PAR1, and BIM and BEE factors. Here, it was shown that several of these factors act as auxin- and BR-responsiveness modulators, which ultimately control the intensity or degree of hypocotyl elongation. It was deduced that, as a consequence of the plant proximity-dependent new, dynamic, and local balance between hormone synthesis and sensitivity (mechanistically resulting from a restructured network of SAS regulators), SAS responses are unleashed and hypocotyls elongate.
Ayudas:	Ministerio de Economía y Competitividad BIO2011-23489 Ministerio de Economía y Competitividad BIO2008-00169 Ministerio de Economía y Competitividad CSD2007-00036 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-697
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Arabidopsis ; Auxins ; Brassinosteroids ; Gibberellins ; Hypocotyl elongation ; Plant proximity ; Shade avoidance syndrome
Publicado en:	Journal of experimental botany, Vol. 65, no. 11 (2014) , p. 2937-2947, ISSN 1460-2431

DOI: 10.1093/jxb/eru083
PMID: 24609653

11 p, 4.7 MB

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