Journal
JOURNAL OF MOLECULAR EVOLUTION
Volume 80, Issue 2, Pages 108-119Publisher
SPRINGER
DOI: 10.1007/s00239-015-9665-0
Keywords
Arabidopsis thaliana; Hordeum vulgare (barley); Circadian clock; Reciprocal BLAST; Homologue
Funding
- James Hutton Institute, University of Dundee
- Biotechnology and Biological Sciences Research Council (BBSRC) [BB/K006568/1]
- studentship programme Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) of the Brazilian Government
- Biotechnology and Biological Sciences Research Council [BB/K006568/1] Funding Source: researchfish
- BBSRC [BB/K006568/1] Funding Source: UKRI
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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.
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