title: Inheritance of Oryza sativa endornavirus in F1 and F2 hybrids between japonica and indica rice.
abstract: We have found a 14 kbp double-stranded RNA (dsRNA) in many cultivars of japonica rice (Oryza sativa L.) but not in any cultivars of indica rice. This dsRNA is an RNA replicon with plasmid-like properties and is proposed to be a novel dsRNA virus, Oryza sativa endornavirus (OSV). Reciprocal crosses between the OSV-carrier japonica variety (Nipponbare) and the OSV-free indica variety (IR 26 or Kasalath) were performed to investigate whether OSV can be transmitted to F1 hybrids. When IR 26 and Nipponbare were used, efficient transmission of OSV from ova (93%) and pollen (89%) was observed. When Kasalath and Nipponbare were used, the OSV transmission efficiency to F1 progeny was 68% from ova and 20% from pollen. The transmission of OSV to F2 progeny plants was also complicated, showing non-Mendelian inheritance. These results suggest that the dsRNA replicon (OSV) is unstable in indica rice plants.
authors.affiliation: Department of Applied Biological Sciences, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Saiwaicho 3-5-8, Fuchu, Tokyo 183-8509, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Horiuchi
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Moriyama
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Fukuhara
mesh_terms: D002678:Chimera / Q000235:genetics*; D003433:Crosses, Genetic; D018562:Disease Transmission, Infectious; D012275:Oryza / Q000145:classification / Q000821:virology*; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D012327:RNA Virus Infections / Q000235:genetics*; D012328:RNA Viruses / Q000472:pathogenicity*; D012330:RNA, Double-Stranded / Q000235:genetics*; D018749:RNA, Plant / Q000235:genetics; D013045:Species Specificity
chemical_list: D012330:RNA, Double-Stranded; D018749:RNA, Plant