Modelling transmission characteristics and epidemic development of the tospovirus–thrip interaction

Arthropod-Plant Interactions - Tập 9 - Trang 107-120 - 2015
M. J. Jeger1, F. van den Bosch2, N. McRoberts3
1Centre for Environmental Policy, Imperial College London, Ascot, UK
2Biomathematics and Bioinformatics, Rothamsted Research, Harpenden, UK
3Plant Pathology Department, University of California Davis, Davis, USA

Tóm tắt

Tospoviruses are plant viruses in the genus Bunyaviridae transmitted in a persistent–propagative manner by a range of thrips species and cause disease in wide range of cultivated crops and wild hosts. The viruses in this genus are the only plant-infecting members of the Bunyaviridae. A distinguishing feature, of tospoviruses, from other persistent–propagative plant viruses is that acquisition from infected host plants only occurs by larvae of thrips species. This transmission characteristic is modelled generically as acquisition by juveniles, an invasion threshold is derived, and the dynamics of the system are compared with systems where adults only are involved in acquisition and inoculation. The comparison suggests that in the model disease develops faster and to a greater extent where adults are involved in both acquisition and inoculation. In that case, mobile non-viruliferous adults visit infected plants to acquire virus and in turn visit healthy plants to inoculate virus, whereas acquisition by non-mobile juveniles depends firstly on eggs being laid on an infected plant and then on the virus passaging trans-stadially from the juvenile to the mobile adult form: other factors being equal, the greater the mobility of vectors the greater the probability of both acquisition and inoculation. Where acquisition is by both juvenile and adult forms of the vector, the derived invasion threshold is simply the sum of the component thresholds for each life stage; however, there may be a fitness cost on combining these characteristics expressed as a trade-off between optimising the life history parameters involved in each acquisition route.

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