|
Type Species |
(PLMVd) |
A circular ssRNA between 335 and 338 bases depending on isolates and sequence variants. The most stable secondary structure is a branched conformation in which neither five domains nor a central conserved region (CCR) can be distinguished (Fig. 6). It is insoluble in 2 M LiCl as is Chrysanthemum chlorotic mottle viroid (CChMVd) which also has a branched most stable secondary structure. Peach latent mosaic viroid (PLMVd) can form hammerhead structures in both polarity strands, and plus and minus monomeric PLMVd RNAs self-cleave in vitro as predicted by these structures, which are thermodynamically stable and most probably act as single hammerhead structures as in CChMVd but not in ASBVd (Fig. 3). Replication most probably occurs through a symmetric rolling-circle model by analogy with ASBVd (Fig. 3). Recorded in many peach-growing areas particularly in those raising American or Japanese cultivars: USA, Japan, China, and the Mediterranean basin. The only known natural host is peach but it can also be experimentally transmitted to peach hybrids. There are conflicting reports on whether or not PLMVd infects other Prunus species.
List of Species Demarcation Criteria in the Genus
An arbitrary level of less than 90% sequence similarity and distinct biological properties, particularly host range, currently separates species within genera.
Official viroid species names are in italics. Tentative names, alternative names ( ), or strains are not italicized. Viroid names, genomic accession numbers of typical sequence variants [ ], sizes {b}, and assigned abbreviations ( ) are:
|
Chrysanthemum chlorotic mottle viroid |
[Y14700] |
{398-399} |
(CChMVd) |
|
Peach latent mosaic viroid |
[M83545] |
{335-338} |
(PLMVd) |
Tentative Species in the Genus
None reported.
|
Apple fruit crinkle viroid |
(AFCVd) |
|
Blueberry mosaic viroid-like RNA |
(BluMVd-RNA) |
|
Burdock stunt viroid |
(BuSVd) |
|
Eggplant latent viroid |
(ELVd) |
|
Nicotiana glutinosa stunt viroid |
(NGSVd) |
|
Pigeon pea mosaic mottle viroid |
(PPMMoVd) |
|
Tomato bunchy top viroid |
(ToBTVd) |
Apsca: siglum from apple scar skin viroid.
Avsun: siglum avocado sunblotch viroid.
Cocad: siglum from coconut cadang-cadang viroid.
Cole: siglum from coleus blumei viroid 1.
Hostu: siglum from hop stunt viroid.
Pelamo: siglum from peach latent mosaic viroid.
Pospi: siglum from potato spindle tuber viroid.
Viroid: from the name given to the subviral agent of potato spindle tuber disease.
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