title: Molecular characterization of two Chinese isolates of Beet western yellows virus infecting sugar beet.
abstract: Beet western yellows virus (BWYV) has previously been reported as an agent of sugar beet yellowing disease in China. In this article, the complete genomic RNA sequences of two Chinese BWYV isolates infecting beet from Inner Mongolia (BWYV-IM) and Gansu (BWYV-GS) were determined and compared with three beet poleroviruses (BMYV, BChV and BWYV-US) and other non-beet-infecting poleroviruses. The genomes of the two isolates were 5,668 nt in length, and had almost the same genomic organization and characteristics as BWYV-US. The full length of BWYV-IM shared nucleotide sequence identities of 97.4, 86.6, 64.4 and 70.8% with BWYV-GS, BWYV-US, BChV and BMYV, respectively. Further sequence analysis indicated that the Chinese BWYV isolates were more closely related to BWYV-US; however, the identity of any gene product between the Chinese isolates and BWYV-US was <90%. Therefore, on the basis of genome sequence, we propose that these Chinese isolates are a distinct strain of BWYV that infect sugar beet. In addition, recombinant detection analysis revealed that BWYV-IM might be a recombinant virus.
authors.affiliation: State Key Laboratory for Agrobiotechnology and Agriculture Ministry Laboratory for Plant Pathology, China Agricultural University, Beijing, 100193, China.
authors.forename: Hai-Ying
authors.initials: HY
authors.lastname: Xiang
authors.forename: Shu-Wei
authors.initials: SW
authors.lastname: Dong
authors.forename: Hui-Zhong
authors.initials: HZ
authors.lastname: Zhang
authors.forename: Wei-Lin
authors.initials: WL
authors.lastname: Wang
authors.forename: Min-Quan
authors.initials: MQ
authors.lastname: Li
authors.forename: Cheng-Gui
authors.initials: CG
authors.lastname: Han
authors.forename: Da-Wei
authors.initials: DW
authors.lastname: Li
authors.forename: Jia-Lin
authors.initials: JL
authors.lastname: Yu
mesh_terms: D001483:Base Sequence; D027461:Beta vulgaris / Q000821:virology*; D002681:China; D018745:Genome, Plant; D017793:Luteovirus / Q000235:genetics* / Q000302:isolation & purification; D010802:Phylogeny; D010935:Plant Diseases / Q000821:virology*