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Genetic diversity and population structure of beet necrotic yellow vein virus in China

Genetic diversity and population structure of beet necrotic yellow vein virus in China

Authors :
Guo-Zhen Zhang
Ning Jiang
Chenggui Han
Ying Wang
Zong-Ying Zhang
Na Zhuo
Chao Zhang
Source :
Virus research. 205
Publication Year :
2015

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.

Details

ISSN :
18727492
Volume :
205
Database :
OpenAIRE
Journal :
Virus research
Accession number :
edsair.doi.dedup.....fd249dc85a6c5e73c3235301ce28e7ed