
Deep sequencing reveals a novel closterovirus associated with wild rose leaf rosette disease
Author(s) -
He Yan,
Yang Zuokun,
Hong Ni,
Wang Guoping,
Ning Guogui,
Xu Wenxing
Publication year - 2015
Publication title -
molecular plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.945
H-Index - 103
eISSN - 1364-3703
pISSN - 1464-6722
DOI - 10.1111/mpp.12202
Subject(s) - closterovirus , biology , virology , deep sequencing , plant virus , virus , rna virus , genome , novel virus , rosette (schizont appearance) , genetics , gene , immunology
Summary A bizarre virus‐like symptom of a leaf rosette formed by dense small leaves on branches of wild roses ( R osa multiflora T hunb.), designated as ‘wild rose leaf rosette disease’ ( WRLRD ), was observed in C hina. To investigate the presumed causal virus, a wild rose sample affected by WRLRD was subjected to deep sequencing of small interfering RNAs ( siRNAs ) for a complete survey of the infecting viruses and viroids. The assembly of siRNAs led to the reconstruction of the complete genomes of three known viruses, namely A pple stem grooving virus ( ASGV ), B lackberry chlorotic ringspot virus ( BCRV ) and P runus necrotic ringspot virus ( PNRSV ), and of a novel virus provisionally named ‘rose leaf rosette‐associated virus’ ( RLRaV ). Phylogenetic analysis clearly placed RLRaV alongside members of the genus C losterovirus , family C losteroviridae. Genome organization of RLRaV RNA (17 653 nucleotides) showed 13 open reading frames ( ORFs ), except ORF 1 and the quintuple gene block, most of which showed no significant similarities with known viral proteins, but, instead, had detectable identities to fungal or bacterial proteins. Additional novel molecular features indicated that RLRaV seems to be the most complex virus among the known genus members. To our knowledge, this is the first report of WRLRD and its associated closterovirus, as well as two ilarviruses and one capilovirus, infecting wild roses. Our findings present novel information about the closterovirus and the aetiology of this rose disease which should facilitate its control. More importantly, the novel features of RLRaV help to clarify the molecular and evolutionary features of the closterovirus.