title: Photoperiod sensitivity of the Arabidopsis circadian clock is tissue-specific.
abstract: Tissue-specific functions of the circadian clock in Arabidopsis have recently been revealed. The vasculature clock shows distinctive gene expression profiles compared to the clock in other tissues under light-dark cycles. However, it has not yet been established whether the vasculature clock also shows unique gene expression patterns that correlate with temperature cycles, another important environmental cue. Here, we detected diel phase of TIMING OF CAB EXPRESSION 1 (TOC1) expression in the vasculature and whole leaf under long-day light-dark cycles and temperature cycles. We found that the vasculature clock had advanced TOC1 phase under light-dark cycles but not under temperature cycles, suggesting that the vasculature clock has lower sensitivity against temperature signals. Furthermore, the phase advancement of TOC1 was seen only under long-day condition but not under short-day condition. These results support our previous conclusion that the circadian clock in vasculature preferentially senses photoperiodic signals.
authors.affiliation: a Division of Integrated Life Science; Graduate School of Biostudies; Kyoto University ; Kyoto , Japan.
authors.forename: Hanako
authors.initials: H
authors.lastname: Shimizu
authors.forename: Takashi
authors.initials: T
authors.lastname: Araki
authors.forename: Motomu
authors.initials: M
authors.lastname: Endo
mesh_terms: D017360:Arabidopsis / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000378:metabolism; D057906:Circadian Clocks / Q000502:physiology*; D009928:Organ Specificity; D017440:Photoperiod; D018515:Plant Leaves / Q000378:metabolism; D058526:Plant Vascular Bundle / Q000502:physiology; D013696:Temperature; D014157:Transcription Factors / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; C411822:TOC1 protein, Arabidopsis; D014157:Transcription Factors
keywords: CAB2, CHLOROPHYLL A/B BINDING PROTEIN 2; CAT3, CATALASE 3.; TOC1, TIMING OF CAB EXPRESSION 1; ambient signal; arabidopsis; circadian clock; phase shift; tissue-specificity