title: A current overview of two viroids that infect chrysanthemums: Chrysanthemum stunt viroid and Chrysanthemum chlorotic mottle viroid.
abstract: The chrysanthemum (Dendranthema X grandiflorum) belongs to the family Asteraceae and it is one of the most popular flowers in the world. Viroids are the smallest known plant pathogens. They consist of a circular, single-stranded RNA, which does not encode a protein. Chrysanthemums are a common host for two different viroids, the Chrysanthemum stunt viroid (CSVd) and the Chrysanthemum chlorotic mottle viroid (CChMVd). These viroids are quite different from each other in structure and function. Here, we reviewed research associated with CSVd and CChMVd that covered disease symptoms, identification, host range, nucleotide sequences, phylogenetic relationships, structures, replication mechanisms, symptom determinants, detection methods, viroid elimination, and development of viroid resistant chrysanthemums, among other studies. We propose that the chrysanthemum and these two viroids represent convenient genetic resources for host-viroid interaction studies.
authors.affiliation: Department of Agricultural Biotechnology, Plant Genomics and Breeding Institute, Institute for Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Korea. wonkyong@gmail.com
authors.forename: Won Kyong
authors.initials: WK
authors.lastname: Cho
authors.forename: Yeonhwa
authors.initials: Y
authors.lastname: Jo
authors.forename: Kyoung-Min
authors.initials: KM
authors.lastname: Jo
authors.forename: Kook-Hyung
authors.initials: KH
authors.lastname: Kim
mesh_terms: D031202:Chrysanthemum / Q000821:virology*; D054884:Host-Pathogen Interactions; D010935:Plant Diseases / Q000821:virology*; D056189:Viral Tropism; D014772:Viroids / Q000302:isolation & purification / Q000502:physiology*; D014779:Virus Replication