title: Insight into the mechanism of end-of-day far-red light (EODFR)-induced shade avoidance responses in Arabidopsis thaliana.
abstract: Shade avoidance responses are changes in plant architecture to reduce the part of a body that is in the shade in natural habitats. The most common warning signal that induces shade avoidance responses is reduction of red/far-red light ratio perceived by phytochromes. A pair of basic helix-loop-helix transcription factors, named PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) and PIF5, is crucially involved in the shade avoidance-induced hypocotyl elongation in Arabidopsis thaliana. It has been recently reported that PIF7 also plays a role in this event. Here, we examined the involvement of these PIFs in end-of-day far-red light (EODFR) responses under light and dark cycle conditions. It was shown that PIF7 played a predominant role in the EODFR-dependent hypocotyl elongation. We propose the mechanism by which PIF7 together with PIF4 and PIF5 coordinately transcribes a set of downstream genes to promote elongation of hypocotyls in response to the EODFR treatment.
authors.affiliation: a Laboratory of Molecular and Functional Genomics , School of Agriculture, Nagoya University , Nagoya , Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Mizuno
authors.affiliation: a Laboratory of Molecular and Functional Genomics , School of Agriculture, Nagoya University , Nagoya , Japan.
authors.forename: Haruka
authors.initials: H
authors.lastname: Oka
authors.affiliation: a Laboratory of Molecular and Functional Genomics , School of Agriculture, Nagoya University , Nagoya , Japan.
authors.forename: Fumi
authors.initials: F
authors.lastname: Yoshimura
authors.affiliation: a Laboratory of Molecular and Functional Genomics , School of Agriculture, Nagoya University , Nagoya , Japan.
authors.forename: Kai
authors.initials: K
authors.lastname: Ishida
authors.affiliation: a Laboratory of Molecular and Functional Genomics , School of Agriculture, Nagoya University , Nagoya , Japan.
authors.forename: Takafumi
authors.initials: T
authors.lastname: Yamashino
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000254:growth & development / Q000502:physiology* / Q000528:radiation effects*; D029681:Arabidopsis Proteins / Q000235:genetics; D018546:Hypocotyl / Q000254:growth & development / Q000528:radiation effects; D008027:Light; D009928:Organ Specificity; D017440:Photoperiod; D014158:Transcription, Genetic / Q000528:radiation effects
chemical_list: D029681:Arabidopsis Proteins
keywords: Arabidopsis thaliana; circadian clock; end-of-day far-red light responses; phytochrome-interacting factor; shade avoidance