Abstract
Wheat yellow mosaic virus (WYMV) is the causal agent of wheat yellow mosaic disease in China. WYMV was detected in wheat sample collected from Zhouzhi of Shanxi province. The nearly complete genomic sequence of Zhouzhi isolate (WYMV-ZZ) was determined; it was compared with six complete sequences of WYMV isolates (five Chinese isolates and one Japanese isolate). WYMV-ZZ and the other six different WYMV isolates shared 96.6 to 97.7% and 95.1 to 98.2% nucleotide sequence identity for RNA1 and RNA2, respectively; at the amino acid level, WYMV-ZZ had 94.1 to 98.2% identity for RNA1 and 94.1 to 96.7% identity for RNA2, respectively, with the other six isolates. Phylogenetic analysis showed that the NIa-VPg region can separate the Chinese isolates from Japanese isolate. Based on the recombinant analysis, there were three possible recombination events; one event was located in RNA1 CI region of WYMV-ZZ with a RDP P-value of 8.526×10-06. This work advanced our understanding of the WYMV molecular variation and was helpful to study the disease spread. Key words: Sequence comparison, phylogenetic analysis, NIa-VPg, recombinant event.  
Highlights
Wheat yellow mosaic virus (WYMV), is the causal agent of wheat yellow mosaic disease of wheat in China and Japan, belongs to the genus Bymovirus within the family Potyviridae and is a soil-borne pathogen, it is transmitted by the fungus-like organism Polymyxa graminis (Sawada, 1927)
The results showed that P3, cytoplasmic inclusion protein (CI), 14K, nuclear inclusion protein a (NIa)-VPg, NIa-Pro, nuclear inclusion protein b (NIb) and coat protein (CP) of WYMV-ZZ were more closely related to WYMV-YA, 7K of WYMV-ZZ was close to WYMV-XQ; and that proteinase 1 (P1) and P2 of WYMV-ZZ were close to WYMV-ZMD
Consistent nucleotide and amino acid, and close phylogenetic relationships may imply the molecular evolution of WYMV is a genetic stability progress
Summary
Wheat yellow mosaic virus (WYMV), is the causal agent of wheat yellow mosaic disease of wheat in China and Japan, belongs to the genus Bymovirus within the family Potyviridae and is a soil-borne pathogen, it is transmitted by the fungus-like organism Polymyxa graminis (Sawada, 1927). Wheat yellow mosaic virus causes typical symptoms including mosaic, yellowing, dwarfing, stunting or excessive tillering, and subsequently decreasing yield. The infected wheat shows light green, oval- or spindle-shape spots; the temperature back to 10°C, the infected leaves show yellow mosaic symptom with the disease spots expand and emerge.
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