Transient silencing mediated by in vitro synthesized double-stranded RNA indicates that PsCdc14 is required for sporangial development in a soybean root rot pathogen  

作　　者：ZHAO Wei YANG XinYu DONG SuoMeng SHENG YuTing WANG YuanChao ZHENG XiaoBo 

机构地区：[1]College of Plant Protection, Key Laboratory of lntegrated Management of Crop Diseases and Pests, Ministry of Education of China, Nanjing Agricultural University, Nanjing 210095, China

出　　处：《Science China(Life Sciences)》2011年第12期1143-1150,共8页中国科学（生命科学英文版）

基　　金：supported by the Special Fund for Agro-Scientific Research in the Public Interest (Grant No. 3-20) from the Chinese government;the Priority Academic Program Development for Jiangsu Higher Education Institutions

摘　　要：In many eukaryotic organisms, Cdcl4 phosphatase regulates multiple biological events during anaphase and is essential for mitosis. It has been shown that Cdcl4 is required for sporulation in the potato blight pathogen Phytophthora infestans; howev- er, the role that the Cdcl4 homolog （PsCdcl4） plays in the soil-borne soybean root rot pathogen P. sojae remains ambiguous. PsCdc14 is highly expressed in spornlation, zoospore, and cyst life stages, but not in vegetative mycelia and infection stages, suggesting that it contributes to asexual reproduction and thus the spread of the disease. Double-stranded RNA （dsRNA） medi- ates gene silencing, a post-transcriptional and highly conserved process in eukaryotes, involving specific gene silencing through degradation of target mRNA. We combined in vitro dsRNA synthesis and a polyethylene glycol-mediated transfor- marion system to construct a dsRNA-mediated transient gene silencing system; and then performed a functional analysis of PsCdcl4 in P. sojae. PsCdc14 mRNA was dramatically reduced in transformants after protoplasts were exposed in in vitro synthesized PsCdc14 dsRNA, resulting in low sporangial production and abnormal development in P. sojae silencing lines. Furthermore, dsRNA-mediated transient gene silencing could enable elucidation of P. sojae rapid gene function, facilitating our understanding of the development and pathogenicity mechanisms of this oomycete fungus.In many eukaryotic organisms,Cdc14 phosphatase regulates multiple biological events during anaphase and is essential for mitosis.It has been shown that Cdc14 is required for sporulation in the potato blight pathogen Phytophthora infestans;however,the role that the Cdc14 homolog(PsCdc14) plays in the soil-borne soybean root rot pathogen P.sojae remains ambiguous.PsCdc14 is highly expressed in sporulation,zoospore,and cyst life stages,but not in vegetative mycelia and infection stages,suggesting that it contributes to asexual reproduction and thus the spread of the disease.Double-stranded RNA(dsRNA) mediates gene silencing,a post-transcriptional and highly conserved process in eukaryotes,involving specific gene silencing through degradation of target mRNA.We combined in vitro dsRNA synthesis and a polyethylene glycol-mediated transformation system to construct a dsRNA-mediated transient gene silencing system;and then performed a functional analysis of PsCdc14 in P.sojae.PsCdc14 mRNA was dramatically reduced in transformants after protoplasts were exposed in in vitro synthesized PsCdc14 dsRNA,resulting in low sporangial production and abnormal development in P.sojae silencing lines.Furthermore,dsRNA-mediated transient gene silencing could enable elucidation of P.sojae rapid gene function,facilitating our understanding of the development and pathogenicity mechanisms of this oomycete fungus.

关 键 词：Phytophthora sojae PsCdc14 SPORANGIUM transient gene silencing 

分 类 号：Q522[生物学—生物化学] Q943.2