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1. Complete genomic sequence analyses of Turnip mosaic virus basal-BR isolates from China | |||
Wang Hongyan,Liu Jin-Liang ,Gao Rui,Chen Jia,Shao Yun-hua,Li Xiang-Dong | |||
Agronomy 05 January 2009 | |||
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Abstract:Isolates of Turnip mosaic virus (TuMV) are divided into four molecular lineages based on host range and geographical origins. Basal-BR is one of the four lineages and represented a new emergent lineage in East Asia. In one previous paper, we report the occurrence of basal-BR isolates in China. Here, we presented the first two complete genomic sequences of Chinese TuMV basal-BR isolates, WFLB06 and TANX2. The genomes of both isolates were 9833 nucleotides excluding the poly(A) tail, and had identical genomic structure. Most of their genes shared the highest identities with Japanese isolates. Recombination analysis showed that WFLB06 was an inter-lineage recombinant of basal-BR and Asian-BR parents, while TANX2 was an intra-lineage recombinant of basal-BR parents, and these two isolates represented two novel recombination patterns of TuMV. The ratio of non-synonymous and synonymous substitution for the P1 gene of Chinese TuMV population was the highest and amounted to 12 times higher than that for the NIa-Pro gene, which implies that the selection pressure on the P1 gene was the highest among the genes present in the genome. | |||
TO cite this article:Wang Hongyan,Liu Jin-Liang ,Gao Rui, et al. Complete genomic sequence analyses of Turnip mosaic virus basal-BR isolates from China[J]. |
2. Molecular variability of five cucumber mosaic virus isolates from China | |||
Liu Yuanyaun,Yu Shanlin,Lan Yufei,Zhang Chengling,Hou Shanshan,Li Xiangdong,Zhang Guangmin,Shi Chengkui | |||
Agronomy 05 January 2009 | |||
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Abstract:Cucumber mosaic virus (CMV) is the type species of genus Cucumovirus and currently divided into three subgroups, IA, IB and II. Here we reported the genome encoding 1a, 2a, 2b, 3a and 3b of five CMV isolates from China and rechecked the subgrouping of CMV with sequences of more isolates. The phylogenetic results indicated that CMV could be divided into three groups genetically, and the group I could be further divided into at least three subgroups. Four of these five isolates belonged to subgroup IB, while isolate RZ was a natural intersubgroup reassortant. The 2b gene of CMV was under positive selection, while other genes were under negative selection. No evidence of selection associated with host adaptation and geographic distribution were found. | |||
TO cite this article:Liu Yuanyaun,Yu Shanlin,Lan Yufei, et al. Molecular variability of five cucumber mosaic virus isolates from China[J]. |
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