Authors: Beibei Ge Zhen He Zhixiang Zhang Hongqing Wang Shifang Li
Publish Date: 2014/09/19
Volume: 159, Issue: 12, Pages: 3197-3210
Abstract
Potato virus M PVM genus Carlavirus family Betaflexviridae is considered to be one of most economically important pathogens of pepino in China However the details and the mechanisms underlying PVM evolution are unknown In this study we determined and analyzed 40 TGB 1 gene sequences 67 TGB 2 and TGB 3 gene sequences and 88 CP and NABP gene sequences from viruses isolated from 19 samples of pepino Solanum muricatum and one sample of tomato S lycopersicum collected from different areas of China Recombination analysis identified only one clear recombinant in the TGB2TGB3CP region but no recombinants were detected for each of the five individual genes Phylogenetic analysis showed that all PVM isolates could be divided into at least two lineages in trees derived from the TGB 2 CP and NABP gene sequences and the lineages seemed to reflect geographical origin The five PVM genes in this study were found to be under strong negative selection pressure The PVM isolates examined showed frequent gene flow between the Chinese and European populations and also within the Chinese population Clear star phylogenies and the neutral equilibrium model test showed that pepino isolates of PVM appear to be experiencing a new expansion after a recent introduction into China and these isolates display low levels of genetic diversity To our knowledge this study is the first report describing genetic structure recombination and gene flow in PVM populations and it provides strong evolutionary evidence for the virus populations from different geographic regions of ChinaThis work was supported by grants from the Earmarked Fund for China Agriculture Research System CARS31 the State Scholarship Fund No 201203250024 the Special Fund for AgroScientific Research in the Public Interest Nos 201203076 and 200903004 the National Basic Research and Development Program of China 973 Program No 2009CB119200 and the National Natural Science Foundation of China Nos 31401796 31171819 and 31000842
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