title: Brassinosteroid-related transcription factor BIL1/BZR1 increases plant resistance to insect feeding.
abstract: The plant steroid hormones brassinosteroids (BRs) play important roles in plant growth and responses to stresses. The up-regulation of pathogen resistance by BR signaling has been analyzed, but the relationship between BR and insect herbivores remains largely unclear. BIL1/BZR1 is a BR master transcription factor known to be involved in the regulation of plant development through work conducted on a gain of function mutation. Here, we analyzed the function of BIL1/BZR1 in response to insect feeding and demonstrated that resistance against thrip feeding was increased in the bil1-1D/bzr1-1D mutant compared to wild-type. We generated Lotus japonicus transgenic plants that over-express the Arabidopsis bil1/bzr1 mutant, Lj-bil1/bzr1-OX. The Lj-bil1/bzr1-OX plants showed increased resistance to thrip feeding. The expression levels of the jasmoninc acid (JA)-inducible VSP genes were increased in both Arabidopsis bil1-1D/bzr1-1D mutants and L. japonicus Lj-bil1/bzr1-OX plants. The resistance to thrip feeding caused by the BIL1/BZR1 gene may involve JA signaling.
authors.affiliation: a Antibiotic Laboratory , RIKEN , Wako , Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Miyaji
authors.forename: Ayumi
authors.initials: A
authors.lastname: Yamagami
authors.forename: Nao
authors.initials: N
authors.lastname: Kume
authors.forename: Masaaki
authors.initials: M
authors.lastname: Sakuta
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Osada
authors.forename: Tadao
authors.initials: T
authors.lastname: Asami
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Arimoto
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nakano
mesh_terms: D000818:Animals; D017360:Arabidopsis / Q000166:cytology / Q000235:genetics / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D060406:Brassinosteroids / Q000378:metabolism*; D004268:DNA-Binding Proteins; D060434:Herbivory; D000070116:Lotus / Q000166:cytology / Q000235:genetics / Q000502:physiology*; D009154:Mutation; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D010641:Phenotype; D018515:Plant Leaves / Q000166:cytology / Q000235:genetics; D030821:Plants, Genetically Modified; D015398:Signal Transduction; D061149:Thysanoptera; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014170:Transformation, Genetic
chemical_list: D029681:Arabidopsis Proteins; C454444:BZR1 protein, Arabidopsis; D060406:Brassinosteroids; D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; D014157:Transcription Factors
keywords: BIL1/BZR1; brassinosteroid; jasmonate; onion thrips; signaling