The prehistory of potyviruses: their initial radiation was during the dawn of agriculture.
The prehistory of potyviruses: their initial radiation was during the dawn of agriculture.
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DOI：
10.1371/journal.pone.0002523
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发表时间：
2008-06-25
期刊：
影响因子：
3.7
通讯作者：
Gibbs, Mark J.
中科院分区：
文献类型：
--
作者：
Gibbs, Adrian J.;Ohshima, Kazusato;Phillips, Matthew J.;Gibbs, Mark J.
马铃薯Y病毒在世界各地都有发现，通过刺探的蚜虫传播，并对作物造成相当大的危害。马铃薯Y病毒是两个最大的植物病毒属之一，约占所有命名植物病毒种类的15%。马铃薯Y病毒何时变得如此多，为什么变得如此之多？在这里我们回答第一个问题，并讨论另一个问题。我们已经推测了大约50种马铃薯Y病毒外壳蛋白基因的部分序列的系统发育，并用各种方法和进化模型详细研究了其中一些病毒的系统发育。根据历史隔离和暴发事件对它们的系统发育进行了校准：20世纪席卷欧洲的李痘病毒疫情，欧洲殖民者建立农业后马铃薯Y病毒入侵澳大利亚，16世纪奴隶贸易可能将豌豆种子中的豌豆蚜传花叶病毒从非洲传输到美洲，以及木瓜环斑病毒从印度传输到美洲的类似传输。我们的研究表明，马铃薯Y病毒外壳蛋白部分基因的进化速率约为1.15×10−4个核苷酸替换/位点/年，而马铃薯Y病毒最初的辐射发生在大约6,600年前，因此与农业的曙光相吻合。我们讨论了农业可能引发了史前马铃薯Y病毒的出现并促进了它们的物种形成的方式。
Potyviruses are found world wide, are spread by probing aphids and cause considerable crop damage. Potyvirus is one of the two largest plant virus genera and contains about 15% of all named plant virus species. When and why did the potyviruses become so numerous? Here we answer the first question and discuss the other. We have inferred the phylogenies of the partial coat protein gene sequences of about 50 potyviruses, and studied in detail the phylogenies of some using various methods and evolutionary models. Their phylogenies have been calibrated using historical isolation and outbreak events: the plum pox virus epidemic which swept through Europe in the 20th century, incursions of potyviruses into Australia after agriculture was established by European colonists, the likely transport of cowpea aphid-borne mosaic virus in cowpea seed from Africa to the Americas with the 16th century slave trade and the similar transport of papaya ringspot virus from India to the Americas. Our studies indicate that the partial coat protein genes of potyviruses have an evolutionary rate of about 1.15×10−4 nucleotide substitutions/site/year, and the initial radiation of the potyviruses occurred only about 6,600 years ago, and hence coincided with the dawn of agriculture. We discuss the ways in which agriculture may have triggered the prehistoric emergence of potyviruses and fostered their speciation.
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