Dear Editor,Rice dwarf virus(RDV),a member of the Phytoreoviurs genus,is transmitted to rice(Oryza sativa)plants by leaf-hopper(Nephotettix cincticeps)in a propagative manner.Infection by RDV results in severe stuntin...Dear Editor,Rice dwarf virus(RDV),a member of the Phytoreoviurs genus,is transmitted to rice(Oryza sativa)plants by leaf-hopper(Nephotettix cincticeps)in a propagative manner.Infection by RDV results in severe stunting growth pheno-types and a dramatic reduction in grain yield.The genome of RDV is composed of 12-segmented double-stranded RNAs(S1-S12 based on their migration rates in agarose gel electro-phoresis).The 12 segments encode seven structural proteins(P1,P2,P3,P5,P7,P8,and P9 as the products of Sl,S2,S3,S5,S7,S8,and S9,respectively)and five nonstructural proteins(Pns4,Pns6,Pnsl0,Pns11,and Pns12 as the products of S4,S6,S10,S11,and S12,respectively).The outer capsid protein P2 is essential for RDV infection of insects and thus influences transmission of RDV by the insect vector(Omura et al.,1998;Zhou et al.,2007).P2 also contributes to the dwarf phenotype of infected rice by interfering with gibberellic acid synthesis(Zhu et al.,2005).When RDV-infected rice plants were main-tained via vegetative propagation for several years without insect transmission,they regained normal growth height due to loss of RDV P2 and Pnsl0 proteins(Pu et al.,2011).展开更多
文摘Dear Editor,Rice dwarf virus(RDV),a member of the Phytoreoviurs genus,is transmitted to rice(Oryza sativa)plants by leaf-hopper(Nephotettix cincticeps)in a propagative manner.Infection by RDV results in severe stunting growth pheno-types and a dramatic reduction in grain yield.The genome of RDV is composed of 12-segmented double-stranded RNAs(S1-S12 based on their migration rates in agarose gel electro-phoresis).The 12 segments encode seven structural proteins(P1,P2,P3,P5,P7,P8,and P9 as the products of Sl,S2,S3,S5,S7,S8,and S9,respectively)and five nonstructural proteins(Pns4,Pns6,Pnsl0,Pns11,and Pns12 as the products of S4,S6,S10,S11,and S12,respectively).The outer capsid protein P2 is essential for RDV infection of insects and thus influences transmission of RDV by the insect vector(Omura et al.,1998;Zhou et al.,2007).P2 also contributes to the dwarf phenotype of infected rice by interfering with gibberellic acid synthesis(Zhu et al.,2005).When RDV-infected rice plants were main-tained via vegetative propagation for several years without insect transmission,they regained normal growth height due to loss of RDV P2 and Pnsl0 proteins(Pu et al.,2011).
