Acquisition of potato leafroll virus byMyzus persicae from secondarily-infected potato plants of different genotypes (original) (raw)

Summary

The acquisition of potato leafroll virus (PLRV) by_Myzus persicae_ nymphs from the top leaves of potato plants was studied throughout a growing season in relation to the antigen titre in those leaves and the feeding behaviour of the aphid. Secondarily-infected plants of eight potato genotypes with different levels of field resistance served as virus sources. Early in the growing season, plants were efficient sources for virus acquisition. The amount of viral antigen detected in_M. persicae_ nymphs fed on the top leaves was strongly correlated with the titres of viral antigen in these leaves. Virus acquisition from the top leaves of older potato plants was markedly impaired and could not be correlated with their virus titre. With increasing age of the potato plants and the development of virus symptoms, the virus titre in the leaves declined and the initial weak correlation between the virus titre and field resistance ratings disappeared. Thus, screening secondarily-infected potato plants for field resistance to PLRV based on the concentration of viral antigen in leaves or in aphids fed on them should be avoided later in the growing season. The feeding rate of_M. persicae_, measured by the number of honeydew droplets excreted, did not account for the reduced uptake of virus from older plants since it was not influenced by the age of the plant. Throughout the growing season, the feeding rate of_M. persicae_ nymphs on PLRV-infected plants was higher on genotypes with low levels of field resistance to PLRV than on genotypes with high ones.

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  1. J. F. J. M. van den Heuvel
    Present address: DLO Research Institute for Plant Protection (IPO-DLO), P.O. Box 9060, 6700 GW, Wageningen, the Netherlands

Authors and Affiliations

  1. Department of Virology, Wageningen Agricultural University, P.O. Box 8045, 6700 EM, Wageningen, the Netherlands
    J. F. J. M. van den Heuvel, J. A. A. M. Dirven, G. J. van Os & D. Peters

Authors

  1. J. F. J. M. van den Heuvel
  2. J. A. A. M. Dirven
  3. G. J. van Os
  4. D. Peters

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van den Heuvel, J.F.J.M., Dirven, J.A.A.M., van Os, G.J. et al. Acquisition of potato leafroll virus by_Myzus persicae_ from secondarily-infected potato plants of different genotypes.Potato Res 36, 89–96 (1993). https://doi.org/10.1007/BF02358723

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