Encapsidated Circular Viroid-like Satellite RNAs (Virusoids) of Plants
The first encapsidated circular, viroid-like satellite RNA of a plant virus was described by Randles et al. (1981). In less than a year, three others were identified (Francki 1987) but, strangely, it was not until 17 years later that a fifth one was reported (Collins et al. 1998). The five viruses which harbour these circular satellite RNAs are listed in Table 1; all are members of the sobemovirus, or Southern bean mosaic virus, group (Francki 1987) which contains at least the nine members listed in Tables 1 and 2. Another unusual feature is that the viruses supporting these satellite RNAs have been found only in Australia and New Zealand (Australasia), with the exception of one isolate of lucerne transient streak virus (LTSV) reported from Canada (Paliwal 1983) and rice yellow mottle virus (RYMV) found in Africa (Yassi et al. 1994).
KeywordsHydroxyl Codon Recombination Amide Sedimentation
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