Evolutionary relationships among barley and Arabidopsis core circadian clock and clock-associated genes

Cristiane P. G. Calixto, Robbie Waugh, John W. S. Brown (Lead / Corresponding author)

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    34 Citations (Scopus)
    299 Downloads (Pure)


    The circadian clock regulates a multitude of plant developmental and metabolic processes. In crop species, it contributes significantly to plant performance and productivity and to the adaptation and geographical range over which crops can be grown. To understand the clock in barley and how it relates to the components in the Arabidopsis thaliana clock, we have performed a systematic analysis of core circadian clock and clock-associated genes in barley, Arabidopsis and another eight species including tomato, potato, a range of monocotyledonous species and the moss, Physcomitrella patens. We have identified orthologues and paralogues of Arabidopsis genes which are conserved in all species, monocot/dicot differences, species-specific differences and variation in gene copy number (e.g. gene duplications among the various species). We propose that the common ancestor of barley and Arabidopsis had two-thirds of the key clock components identified in Arabidopsis prior to the separation of the monocot/dicot groups. After this separation, multiple independent gene duplication events took place in both monocot and dicot ancestors.

    Original languageEnglish
    Pages (from-to)108-119
    Number of pages12
    JournalJournal of Molecular Evolution
    Issue number2
    Publication statusPublished - Feb 2015


    • Arabidopsis thaliana
    • Circadian clock
    • Homologue
    • Hordeum vulgare (barley)
    • Reciprocal BLAST

    ASJC Scopus subject areas

    • Molecular Biology
    • Genetics
    • Ecology, Evolution, Behavior and Systematics


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