昆虫媒介传播病毒颗粒数量的估计。
Estimation of the number of virus particles transmitted by an insect vector.
作者信息
Moury Benoît, Fabre Frédéric, Senoussi Rachid
机构信息
Institut National de la Recherche Agronomique, UR407, Pathologie Végétale, F-84143 Montfavet, Cedex, France.
出版信息
Proc Natl Acad Sci U S A. 2007 Nov 6;104(45):17891-6. doi: 10.1073/pnas.0702739104. Epub 2007 Oct 30.
Plant viruses are submitted to narrow population bottlenecks both during infection of their hosts and during horizontal transmission between host individuals. The size of bottlenecks exerted on virus populations during plant invasion has been estimated in a few pathosystems but is not addressed yet for horizontal transmission. Using competition for aphid transmission between two Potato virus Y variants, one of them being noninfectious but equally transmissible, we obtained estimates of the size of bottlenecks exerted on an insect-borne virus during its horizontal transmission. We found that an aphid transmitted on average 0.5-3.2 virus particles, which is extremely low compared with the census viral population into a plant. Such narrow bottlenecks emphasize the strength of stochastic events acting on virus populations, and we illustrate, in modeling virus emergence, why estimating this parameter is important.
植物病毒在感染宿主以及在宿主个体间水平传播的过程中都会经历狭窄的种群瓶颈。在少数病害系统中已估算出植物侵染过程中施加于病毒种群的瓶颈大小，但水平传播方面尚未涉及。利用两种马铃薯Y病毒变体之间对蚜虫传播的竞争，其中一种无感染性但同样具有传播性，我们获得了在水平传播过程中施加于虫媒病毒的瓶颈大小的估计值。我们发现，一只蚜虫平均传播0.5 - 3.2个病毒粒子，与进入植物的病毒普查种群相比极低。如此狭窄的瓶颈凸显了作用于病毒种群的随机事件的强度，并且我们在模拟病毒出现时说明了为何估算此参数很重要。
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