White P S, Morales F, Roossinck M J
Plant Biology Division, S. R. Noble Foundation, Ardmore, Oklahoma 73402.
Virology. 1995 Feb 20;207(1):334-7. doi: 10.1006/viro.1995.1088.
Segmented genomes of RNA viruses are thought to evolve and be maintained in analogy to sexual recombination and reassortment in eukaryotic systems. If reassortment among genomes is an important event in cucumoviral evolution, then such events should be detectable among extant viruses. In this study, phylogenetic analyses of cucumoviruses were performed using aligned amino acid sequences. The results reveal different relationships among species when the three genomic segments are compared, suggesting that reassortment events have given rise to extant forms. In addition, we describe a cucumovirus isolate that is composed of genomic segments from two distinct viral species. These results indicate that reassortment events may provide a mechanism for speciation in cucumoviruses.
RNA病毒的分段基因组被认为是通过类似于真核生物系统中的有性重组和重配来进化和维持的。如果基因组间的重配是黄瓜花叶病毒进化中的一个重要事件，那么此类事件应该在现存病毒中能够被检测到。在本研究中，利用比对后的氨基酸序列对黄瓜花叶病毒进行了系统发育分析。结果显示，当比较三个基因组片段时，不同物种间呈现出不同的关系，这表明重配事件产生了现存的病毒形式。此外，我们描述了一种黄瓜花叶病毒分离株，它由来自两个不同病毒物种的基因组片段组成。这些结果表明，重配事件可能为黄瓜花叶病毒的物种形成提供一种机制。
