Abstract
Members of the small family of Arabidopsis PSEUDO-RESPONSE REGULATORS (PRR1/TOC1, PRR3, PRR5, PRR7, and PRR9) play roles close to the circadian clock in Arabidopsis thaliana. We have reported that the rice (Oryza sativa) genome also encodes a set of PRR counterparts (designated OsPRR1, OsPRR37, OsPRR59, OsPRR73, and OsPRR95 respectively). To gain new insight into the molecular functions of OsPRRs, we carried out genetic complementation analyses by introducing two representative rice genes, OsPRR1 and OsPRR37, into the corresponding Arabidopsis loss-of-function mutants (toc1 and prr7 respectively). The results showed that these OsPRR and AtPRR genes are genetically interchangeable at least in part, suggesting the conserved clock-associated function of these OsPRRs.
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