title: Hormone-controlled UV-B responses in plants.
abstract: Ultraviolet B (UV-B) light is a portion of solar radiation that has significant effects on the development and metabolism of plants. Effects of UV-B on plants can be classified into photomorphogenic effects and stress effects. These effects largely rely on the control of, and interactions with, hormonal pathways. The fairly recent discovery of the UV-B-specific photoreceptor UV RESISTANCE LOCUS 8 (UVR8) allowed evaluation of the role of downstream hormones, leading to the identification of connections with auxin and gibberellin. Moreover, a substantial overlap between UVR8 and phytochrome responses has been shown, suggesting that part of the responses caused by UVR8 are under PHYTOCHROME INTERACTING FACTOR control. UV-B effects can also be independent of UVR8, and affect different hormonal pathways. UV-B affects hormonal pathways in various ways: photochemically, affecting biosynthesis, transport, and/or signaling. This review concludes that the effects of UV-B on hormonal regulation can be roughly divided in two: inhibition of growth-promoting hormones; and the enhancement of environmental stress-induced defense hormones.
authors.affiliation: Laboratory for Functional Plant Biology, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium.
authors.forename: Lucas
authors.initials: L
authors.lastname: Vanhaelewyn
authors.affiliation: Department of Biology, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.
authors.forename: Els
authors.initials: E
authors.lastname: Prinsen
authors.affiliation: Laboratory for Functional Plant Biology, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium.
authors.forename: Dominique
authors.initials: D
authors.lastname: Van Der Straeten
authors.affiliation: Laboratory for Functional Plant Biology, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium Filip.Vandenbussche@ugent.be.
authors.forename: Filip
authors.initials: F
authors.lastname: Vandenbussche
mesh_terms: D029681:Arabidopsis Proteins / Q000502:physiology; D002868:Chromosomal Proteins, Non-Histone / Q000502:physiology; D005875:Gibberellins / Q000502:physiology; D007210:Indoleacetic Acids / Q000378:metabolism; D010937:Plant Growth Regulators / Q000502:physiology*; D018521:Plant Physiological Phenomena / Q000528:radiation effects; D010944:Plants / Q000528:radiation effects*; D014466:Ultraviolet Rays
chemical_list: D029681:Arabidopsis Proteins; D002868:Chromosomal Proteins, Non-Histone; D005875:Gibberellins; D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; C525052:Uvr8 protein, Arabidopsis
keywords: Arabidopsis; UV-B.; auxin; gibberellin; hormone; jasmonate; photomorphogenesis