
SummaryUltraviolet‐B light (UV‐B) regulates the expression of genes in a wavelength‐ and fluence rate‐dependent fashion. A signaling pathway consisting of CONSTITUTIVE PHOTOMORPHOGENESIS 1 (COP1) and UV RESISTANCE LOCUS 8 (UVR 8) mediates responsiveness to longer wavelength, low intensity UV‐B light‐activating, for example, HY5 gene expression. By contrast, transcription of another group of genes, including ANAC13, modulated by shorter wavelength, higher intensity UV‐B is controlled by a yet unknown and largely COP1‐independent signaling cascade. Here we provide evidence by promoter deletion analysis, and characterization of genetic mutants displaying aberrant expression patterns, that two cis‐regulatory elements, designated MREANAC13 and UVBoxANAC13, are required for maximal UV‐B induction of the ANAC13 gene in transgenic plants. These elements are located in the proximal 150‐bp region of the ANAC13 promoter. They show no significant similarity to each other; the putative MREANAC13 (‐AACCTT‐) is closely related to MRECHS (‐AACCTA‐) found in the CHALCONE SYNTHASE (CHS) gene, whereas UVBoxANAC13 (with core sequence CAAG) represents a novel cis‐regulatory element. The novel UVBoxANAC13 sequence is significantly enriched in the promoter region of a subset of UV‐B‐induced genes with similar activation properties as ANAC13. In addition, we demonstrate that expression of a chimeric gene containing only the dimerized 12‐mer containing UVBoxANAC13 fused to a minimal CaMV35S promoter/luciferase reporter is (i) efficiently induced by shorter wavelength, higher intensity UV‐B, but (ii) does not respond either to longer wavelength UV‐B and red light or (iii) to abscisic acid treatment and osmotic, salt, heat and cold stresses.
Arabidopsis Proteins/genetics/metabolism, arabidopsis; arabidopsis proteins; base sequence; genetic; genetics; genetics/metabolism; light; molecular sequence data; point mutation; promoter regions; radiation effects; regulatory elements; transcription; transcriptional; ultraviolet rays, Base Sequence, Light, Transcription, Genetic, Arabidopsis Proteins, Ultraviolet Rays, Ubiquitin-Protein Ligases, Molecular Sequence Data, Arabidopsis, Arabidopsis/genetics/metabolism, Promoter Regions, Genetic/genetics, Regulatory Elements, Transcriptional/genetics, Transcription, Genetic/radiation effects, Point Mutation, Regulatory Elements, Transcriptional, Promoter Regions, Genetic
Arabidopsis Proteins/genetics/metabolism, arabidopsis; arabidopsis proteins; base sequence; genetic; genetics; genetics/metabolism; light; molecular sequence data; point mutation; promoter regions; radiation effects; regulatory elements; transcription; transcriptional; ultraviolet rays, Base Sequence, Light, Transcription, Genetic, Arabidopsis Proteins, Ultraviolet Rays, Ubiquitin-Protein Ligases, Molecular Sequence Data, Arabidopsis, Arabidopsis/genetics/metabolism, Promoter Regions, Genetic/genetics, Regulatory Elements, Transcriptional/genetics, Transcription, Genetic/radiation effects, Point Mutation, Regulatory Elements, Transcriptional, Promoter Regions, Genetic
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