Aphid vectors impose a major bottleneck on Soybean dwarf virus populations for horizontal transmission in soybean
2019
Many RNA viruses have genetically diverse populations in a single host. Important biological characteristics may be related to the levels of diversity, including adaptability, host specificity, and host range. Shifting the virus between hosts might result in a change in the levels of diversity associated with the new host. The level of genetic diversity for these viruses is related to host, vector and virus interactions; understanding these interactions may facilitate the prediction and prevention of emerging viral diseases. It is known that luteoviruses have a very specific interaction with aphid vectors. Previous studies suggested that there may be a trade-off effect between the viral adaptation and aphid transmission when Soybean dwarf virus (SbDV) was transmitted into new plant hosts by aphid vectors. In this study, virus titers in different aphid vectors and the levels of population diversity of SbDV in different plant hosts were examined during the course of transmission assays. The diversity of SbDV populations revealed biases for particular types of substitutions and regions of the genome that may accumulate more mutations among different hosts. The selection on SbDV in soybean was probably leading to loss of the virus-vector interaction. The most probable virus binding site is at the accessory salivary gland which is known for specific interactions between aphid and virus in many systems.
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