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Open Access Commentary

A modern circadian clock in the common angiosperm ancestor of monocots and eudicots

C Robertson McClung

Author Affiliations

Department of Biological Sciences, 6044 Gilman Laboratories, Dartmouth College, Hanover, New Hampshire 03755, USA

BMC Biology 2010, 8:55  doi:10.1186/1741-7007-8-55

Published: 7 May 2010


The circadian clock enhances fitness through temporal organization of plant gene expression, metabolism and physiology. Two recent studies, one in BMC Evolutionary Biology, demonstrate through phylogenetic analysis of the CCA1/LHY and TOC1/PRR gene families that the common ancestor of monocots and eudicots had components sufficient to construct a circadian clock consisting of multiple interlocked feedback loops.

See research article