title: Perception and signalling of light and temperature cues in plants.
abstract: Light and temperature patterns are often correlated under natural plant growth conditions. In this review, we analyse the perception and signalling mechanisms shared by both these environmental cues and discuss the functional implications of their convergence to control plant growth. The first point of integration is the phytochrome B (phyB) receptor, which senses light and temperature. Downstream of phyB, the signalling core comprises two branches, one involving PHYTOCHROME INTERACTING FACTOR 4 (PIF4) and the other CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1) and ELONGATED HYPOCOTYL 5 (HY5). The dynamics of accumulation and/or localization of each of these core signalling components depend on light and temperature conditions. These pathways are connected through COP1, which enhances the activity of PIF4. The circadian clock modulates this circuit, since EARLY FLOWERING 3 (ELF3), an essential component of the evening complex (EC), represses expression of the PIF4 gene and PIF4 transcriptional activity. Phytochromes are probably not the only entry point of temperature into this network, but other sensors remain to be established. The sharing of mechanisms of action for two distinct environmental cues is to some extent unexpected, as it renders these responses mutually dependent. There are nonetheless many ecological contexts in which such a mutual influence could be beneficial.
authors.affiliation: Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires-CONICET, 1405, Buenos Aires, Argentina.
authors.forename: Martina
authors.initials: M
authors.lastname: Legris
authors.affiliation: Departamento de Genética Molecular de Plantas, Centro Nacional de Biotecnología (CNB-CSIC), Campus de Cantoblanco, Darwin 3, 28049, Madrid, Spain.
authors.forename: Cristina
authors.initials: C
authors.lastname: Nieto
authors.affiliation: IFEVA, Facultad de Agronomía, Universidad de Buenos Aires and CONICET, Av. San Martín 4453, 1417, Buenos Aires, Argentina.
authors.forename: Romina
authors.initials: R
authors.lastname: Sellaro
authors.affiliation: Departamento de Genética Molecular de Plantas, Centro Nacional de Biotecnología (CNB-CSIC), Campus de Cantoblanco, Darwin 3, 28049, Madrid, Spain.
authors.forename: Salomé
authors.initials: S
authors.lastname: Prat
authors.affiliation: Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires-CONICET, 1405, Buenos Aires, Argentina.|IFEVA, Facultad de Agronomía, Universidad de Buenos Aires and CONICET, Av. San Martín 4453, 1417, Buenos Aires, Argentina.
authors.forename: Jorge J
authors.initials: JJ
authors.lastname: Casal
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics / Q000378:metabolism; D018506:Gene Expression Regulation, Plant / Q000235:genetics / Q000502:physiology; D018546:Hypocotyl / Q000235:genetics / Q000378:metabolism; D008027:Light; D051939:Phytochrome B / Q000235:genetics / Q000378:metabolism; D013696:Temperature; D044767:Ubiquitin-Protein Ligases
chemical_list: D029681:Arabidopsis Proteins; D051792:Basic Helix-Loop-Helix Proteins; D051939:Phytochrome B; D044767:Ubiquitin-Protein Ligases; C459466:PIF4 protein, Arabidopsis; C471983:AT2G32950 protein, Arabidopsis
keywords: CONSTITUTIVE PHOTOMORPHOGENIC 1; DE-ETIOLATED1; EARLY FLOWERING 3; ELONGATED HYPOCOTYL 5; PHYTOCHROME INTERACTING FACTOR 4; phytochrome B