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PsSAK1 , a mitogen-activated protein (MAP) kinase from  Phytophthora sojae , plays an important role in host infection and zoospore viability. However, the downstream mechanism of PsSAK1 remains unclear. In this study, the 3'-tag digital gene expression (DGE) profiling method was applied to sequence the global transcriptional sequence of  PsSAK1 -silenced mutants during the cysts stage and 1.5 h after inoculation onto susceptible soybean leaf tissues. Compared with the gene expression levels of the recipient  P. sojae  strain, several candidates of Myb family were differentially expressed (up or down) in response to the loss of PsSAK1, including of a R2R3-type Myb transcription factor,  PsMYB1 . qRT-PCR indicated that the transcriptional level of  PsMYB1  decreased due to  PsSAK1  silencing. The transcriptional level of  PsMYB1  increased during sporulating hyphae, in germinated cysts, and early infection. Silencing of  PsMYB1  results in three phenotypes: a) no cleavage of the cytoplasm into uninucleate zoospores or release of normal zoospores, b) direct germination of sporangia, and c) afunction in zoospore-mediated plant infection. Our data indicate that the  PsMYB1  transcription factor functions downstream of MAP kinase  PsSAK1  and is required for zoospore development of  P. sojae .

A Myb Transcription Factor of Phytophthora sojae, Regulated by MAP Kinase PsSAK1, Is Required for Zoospore Development