title: Circularity of the ribonucleic acids associated with cadang-cadang disease.
abstract: The ribonucleic acids, ccRNA-1 and ceRNA-2, associated with cadang-cadang disease are circular single-stranded molecules comprising 310 +/- 3 nucleotides and 438 +/- 5 nucleotides, respectively; their molecular weights are estimated to be 1.05 and 1.49 x 10(5) daltons. Therefore ceRNA-2 appears not to be a dimer of ccRNA-1, although it is known to have nucleotide sequences in common with ccRNA-1. Differences in the native structure of the two RNAs as determined by length measurements may account for previously described differences in their properties. Both RNAs resemble viroids, but ccRNA-1 is smaller, and ceRNA-2 is larger, than the viroids which have been characterized.
authors.affiliation: Department of Plant Pathology, Waite Agricultural Research Institute, University of Adelaide, Glen Osmond 5064, South Australia.
authors.forename: J W
authors.initials: JW
authors.lastname: Randles
authors.forename: T
authors.initials: T
authors.lastname: Hatta