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Turnip Mosaic Virus (turnip + mosaic_virus)
Selected AbstractsMolecular Characterization of the 3,-Terminal Region of Turnip mosaic virus Isolates from Eastern ChinaJOURNAL OF PHYTOPATHOLOGY, Issue 6 2007Y.-P. Tian Abstract Turnip mosaic virus (TuMV; genus Potyvirus, family Potyviridae) causes great losses to cruciferous crop production worldwide. The 3,-terminal genomic sequences of eight TuMV isolates from eastern China were compared with those of 74 other Chinese TuMV isolates of known host origin in the GenBank and isolated during the past 25 years. The reported sequences of the eight TuMV isolates are 1125 or 1126-nucleotides (nt) long excluding the poly(A) tail. They all contain one partial open reading frame of 912 nt, encoding 304 amino acids, followed by a stop codon and a non-translated region of 209,210 nt. Results of phylogenetic analyses showed that Chinese TuMV isolates clustered into three groups: basal-BR, Asian-BR and world-B. The ratios of non-synonymous and synonymous substitutions and results of amino acid alignment provided evidence for purifying or negative selection in TuMV populations of China. [source] A phylogeographical study of the Turnip mosaic virus population in East Asia reveals an ,emergent' lineage in JapanMOLECULAR ECOLOGY, Issue 14 2006YASUHIRO TOMITAKA Abstract The genetic structure of populations of Turnip mosaic virus (TuMV) in East Asia was assessed by making host range and gene sequence comparisons of 118 isolates utilizing a population genetic approach. Most, but not all, isolates collected from Brassica plants in China infected only Brassica plants, whereas those from Japan infected both Brassica and Raphanus (BR) plants. Analyses of the positions of recombination sites in five regions of the genomes (one third of the full sequence) of the many recombinant isolates were fully congruent with the results of phylogenetic analysis, and at least one recombination type pattern was shared between Chinese and Japanese populations. One lineage of nonrecombinant isolates from the basal-BR lineage was found in 2000 in Kyushu, Japan but none in China, and have since been found over the whole island. The sudden expansion of this basal-BR population was strongly supported by calculations showing the deviations from the neutral equilibrium model for the individual geographical lineages with overall lack of nucleotide diversity, and by analysis of mismatch distribution. Our study shows that the recent Chinese and Japanese TuMV isolates are part of the same population but are discrete lineages. [source] New hosts of Turnip mosaic virus in ZimbabwePLANT PATHOLOGY, Issue 3 2002S. Chivasa [source] | ||||||||||