title: Creation of transgenic rice plants producing small interfering RNA of Rice tungro spherical virus.
abstract: Rice tungro spherical virus (RTSV), also known as Rice waika virus, does not cause visible symptoms in infected rice plants. However, the virus plays a critical role in spreading Rice tungro bacilliform virus (RTBV), which is the major cause of severe symptoms of rice tungro disease. Recent studies showed that RNA interference (RNAi) can be used to develop virus-resistance transgenic rice plants. In this report, we presented simple procedures and protocols needed for the creation of transgenic rice plants capable of producing small interfering RNA specific against RTSV sequences. Notably, our study showed that 60 out of 64 individual hygromycin-resistant lines (putative transgenic lines) obtained through transformation carried transgenes designed for producing hairpin double-stranded RNA. Northern blot analyses revealed the presence of small interfering RNA of 21- to 24-mer in 46 out of 56 confirmed transgenic lines. Taken together, our study indicated that transgenic rice plants carrying an inverted repeat of 500-bp fragments encoding various proteins of RTSV can produce small interfering RNA from the hairpin RNA transcribed from that transgene. In light of recent studies with other viruses, it is possible that some of these transgenic rice lines might be resistant to RTSV.
authors.affiliation: a Research Team for Vector-borne Diseases; National Agriculture Research Center ; Tsukuba , Ibaraki , Japan.
authors.forename: Dung Tien
authors.initials: DT
authors.lastname: Le
authors.forename: Ha Duc
authors.initials: HD
authors.lastname: Chu
authors.forename: Takahide
authors.initials: T
authors.lastname: Sasaya
mesh_terms: D036022:Capsid Proteins / Q000037:antagonists & inhibitors / Q000235:genetics; D060467:Disease Resistance; D012275:Oryza / Q000235:genetics* / Q000254:growth & development / Q000821:virology; D010935:Plant Diseases / Q000235:genetics / Q000821:virology; D030821:Plants, Genetically Modified / Q000235:genetics / Q000254:growth & development / Q000821:virology*; D018749:RNA, Plant / Q000378:metabolism; D034741:RNA, Small Interfering / Q000378:metabolism*; D012367:RNA, Viral / Q000037:antagonists & inhibitors*; D019193:Waikavirus / Q000235:genetics
chemical_list: D036022:Capsid Proteins; D018749:RNA, Plant; D034741:RNA, Small Interfering; D012367:RNA, Viral
keywords: CP, coat protein; NTP, nucleotide triphosphat-binding protein; Pol, RNA-dependent RNA polymerase; Pro, 3C-like protease; RNAi; RTBS, rice tungro bacilliform virus; RTSV, rice tungro spherical virus; disease resistance; rice tungro disease; rice tungro spherical virus; transgenic rice