title: Genetic diversity and population structure of beet necrotic yellow vein virus in China.
abstract: Beet necrotic yellow vein virus (BNYVV) is a serious threat to the sugar beet industry worldwide. However, little information is available regarding the genetic diversity and population structure of BNYVV in China. Here, we analyzed multiple sequences from four genomic regions (CP, RNA3, RNA4 and RNA5) of a set of Chinese isolates. Sequence analyses revealed that several isolates were mixed infections of variants with different genotypes and/or different p25 tetrad motifs. In total, 12 distinct p25 tetrads were found in the Chinese BNYVV population, of which four tetrads were newly identified. Phylogenetic analyses based on four genes (CP, RNA3-p25, RNA4-p31 and RNA5-p26) in isolates from around the world revealed the existence of two to four groups, which mostly corresponded to previously reported phylogenetic groups. Two new subgroups and a new group were identified from the Chinese isolates in p25 and p26 trees, respectively. Selection pressure analysis indicated that there was a positive selection pressure on the p25 from the Chinese isolates, but the other three proteins were under a negative selection pressure. There was frequent gene flow between geographically distant populations, which meant that BNYVV populations from different provinces were not geographically differentiated.
authors.affiliation: State Key Laboratory for Agrobiotechnology and Department of Plant Pathology, China Agricultural University, Beijing 100193, China. Electronic address: zhuona1985@163.com.
authors.forename: Na
authors.initials: N
authors.lastname: Zhuo
authors.affiliation: State Key Laboratory for Agrobiotechnology and Department of Plant Pathology, China Agricultural University, Beijing 100193, China. Electronic address: jiangning1990@163.com.
authors.forename: Ning
authors.initials: N
authors.lastname: Jiang
authors.affiliation: State Key Laboratory for Agrobiotechnology and Department of Plant Pathology, China Agricultural University, Beijing 100193, China. Electronic address: zhangchao2010cau@163.com.
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Agrobiotechnology and Department of Plant Pathology, China Agricultural University, Beijing 100193, China. Electronic address: zzy0901@gmail.com.
authors.forename: Zong-Ying
authors.initials: ZY
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Agrobiotechnology and Department of Plant Pathology, China Agricultural University, Beijing 100193, China. Electronic address: zhanggzh@cau.edu.cn.
authors.forename: Guo-Zhen
authors.initials: GZ
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Agrobiotechnology and Department of Plant Pathology, China Agricultural University, Beijing 100193, China. Electronic address: hanchenggui@cau.edu.cn.
authors.forename: Cheng-Gui
authors.initials: CG
authors.lastname: Han
authors.affiliation: State Key Laboratory for Agrobiotechnology and Department of Plant Pathology, China Agricultural University, Beijing 100193, China. Electronic address: yingwang@cau.edu.cn.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
mesh_terms: D001483:Base Sequence; D027461:Beta vulgaris / Q000821:virology*; D002681:China; D014644:Genetic Variation; D005838:Genotype; D008969:Molecular Sequence Data; D010802:Phylogeny; D010935:Plant Diseases / Q000821:virology*; D010942:Plant Viruses / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification; D012328:RNA Viruses / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification; D014764:Viral Proteins / Q000235:genetics
chemical_list: D014764:Viral Proteins
keywords: BNYVV; Gene flow; Genetic diversity; Population structure; Selection; p25 tetrad