Selection Pressure and Founder Effects Constrain Genetic Variation in Differentiated Populations of Soilborne Bymovirus Wheat yellow mosaic virus (Potyviridae) in China
文献类型： 外文期刊
作者： Sun, B. -J. 1 ; Sun, L. -Y. 1 ; Tugume, A. K. 4 ; Adams, M. J.; Yang, J. 1 ; Xie, L. -H. 2 ; Chen, J. -P. 1 ;
作者机构： 1.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, Zhejiang Prov Key Lab Plant Virol, MoA Key Lab Plant Protect & Biotechnol,State Key, Hangzhou 310021, Zhejiang, Peoples R China
2.Fujian Agr & Forestry Univ, Inst Plant Virol, Fuzhou 350002, Fujian, Peoples R China
3.Henan Agr Univ, Coll Plant Protect, Zhengzhou 450002, Henan Province, Peoples R China
4.Makerere Univ, Coll Nat Sci, Sch Biosci, Dept Biol Sci, K
期刊名称：PHYTOPATHOLOGY （ 影响因子：4.025； 五年影响因子：4.394 ）
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收录情况： SCI
摘要： To study the population genetic structure and forces driving the evolution of Wheat yellow mosaic virus (WYMV), the nucleotide sequences encoding the coat protein (CP) (297 sequences) or the genome-linked virion protein (VPg) (87 sequences) were determined from wheat plants growing at 11 different locations distributed in five provinces in China. There were close phylogenetic relationships between all sequences but clustering on the phylogenetic trees was congruent with their provenance, suggesting an origin-dependent population genetic structure. There were low levels of genetic diversity, ranging from 0.00035 +/- 0.00019 to 0.01536 +/- 0.00043 (CP), and 0.00086 +/- 0.00039 to 0.00573 +/- 0.00111 (VPg), indicating genetic stability or recent emergence of WYMV in China The results may suggest that founder effects play a role in shaping the genetic structure of WYMV. Between-population diversity was consistently higher than within-population diversity, suggesting limited gene flow between subpopulations (average F-ST 0.6241 for the CP and 0.7981 for the VPg). Consistent amino acid substitutions correlated with the provenance of the sequences were observed at nine positions in the CP (but none in the VPg), indicating an advanced stage in population structuring. Strong negative (purifying) selection was implicated on both the CP and VPg but positive selection on a few codons in the CP, indicating an ongoing molecular adaptation.
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