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Title: Evidence for a single infectious species of potato spindle tuber viroid. Author: Morris TJ. Journal: Intervirology; 1979; 11(2):89-96. PubMed ID: 429145. 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.[Abstract] [Full Text] [Related] [New Search]