title: Evidence for a single infectious species of potato spindle tuber viroid.
abstract: Potato spindle tuber viroid (PSTV) has been separated into two electrophoretic species on polyacrylamide gels containing 8 M urea at 60 degrees. Only the slower-migrating electrophoretic form was infectious and is presumably the circular form of the molecule. Both forms had similar base compositions with a 55-58% GC content, similar to the citrus exocortis viroid. Labeling studies in vivo suggest that the viroid is not methylated.
mesh_terms: D001483:Base Sequence; D004591:Electrophoresis, Polyacrylamide Gel; D009711:Nucleotides / Q000032:analysis; D010935:Plant Diseases; D010942:Plant Viruses / Q000032:analysis* / Q000472:pathogenicity; D012367:RNA, Viral / Q000032:analysis*; D014675:Vegetables
chemical_list: D009711:Nucleotides; D012367:RNA, Viral