Journal
PHYTOPATHOLOGY
Volume 103, Issue 9, Pages 949-959Publisher
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/PHYTO-01-13-0013-R
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Funding
- Chinese Ministry of Agriculture [201303021]
- Project of New Varieties Genetically Modified Wheat of China [2008ZX08002-001]
- China Agriculture Research System from the Ministry of Agriculture of the P.R. China [CARS-3-1]
- Ministry of Science and Technology of the P.R. China [2012CB722504]
- Modern Agricultural Biotechnology and Crop Disease Control from the Key Subject Construction Program of Zhejiang Province
- Program for Zhejiang Leading Team of Science and Technology Innovation
- Program for Leading Team of Agricultural Research and Innovation of Ministry of Agriculture, China
- Biotechnology and Biological Sciences Research Council of the United Kingdom
- Biotechnology and Biological Sciences Research Council [BBS/E/C/00004206] Funding Source: researchfish
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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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