Abstract
In land plants, the mechanisms underlying circadian clock have so far been analyzed mainly on angiosperm lineages, whereas there are only a few studies concerning relatively primitive species such as ferns and bryophytes. Therefore, it is unknown how similar or diverged are the mechanisms in plant kingdom, and the evolution of plant circadian systems remains to be elucidated. For these reasons, we started to study the mechanisms of the clock in the moss Physcomitrella patens, which is one of basal land plants. The genome of P. patens contains many homologs of A. thaliana clock genes such as CCA1/LHY and PRR family genes. We cloned two CCA1/LHY homolog genes PpCCA1a and PpCCA1b, and also constructed single and double knockout strains for these genes. We will report the results of recent analyses in this conference.
