Circadian rhythm organizes inner physiology with respect to the external world, providing life with the ability to anticipate and thereby better prepare for major fluctuations in its environment.The products of the FREQUENCY (FRQ) gene are central components of the Neurospora crassa oscillator.To determine its function in Magnaporthe oryzae, the causal agent of rice blast, we functionally characterized the MoFRQ gene that is orthologous to FRQ of N.crassa.