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Testing the Physiological Barriers to Viral Transmission in Aphids Using Microinjection
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Different helper factors associated with aphid transmission of some potyviruses

N Sako1, K Ogata

  • 1Laboratory of Plant Pathology, Faculty of Agriculture, Saga University, Saga 840, Japan.

Virology
|July 30, 1981
PubMed

Insights

Aphids transmit viruses like watermelon mosaic virus (WMV) using helper factors. These distinct, potyvirus-specific helper factors enable transmission of certain viruses but not others, showing high specificity.

Area of Science:

  • Plant Virology
  • Entomology
  • Molecular Biology

Background:

  • Potyviruses are significant plant pathogens transmitted by insect vectors.
  • Virus transmission efficiency can be influenced by specific interactions between the virus, vector, and host plant.
  • Helper factors are hypothesized to play a role in potyvirus transmission by aphids.

Purpose of the Study:

  • To investigate the role and specificity of helper factors in the aphid transmission of purified potyviruses.
  • To determine if helper factors induced by one potyvirus can facilitate the transmission of other potyviruses.

Main Methods:

  • Purified watermelon mosaic virus (WMV), turnip mosaic virus (TuMV), and potato virus Y (PVY) were used.
  • Myzus persicae aphids were used as vectors.
  • Transmission assays involved artificial membrane feeding with purified viruses and soluble fractions from infected leaf extracts.
  • Helper factors were extracted from infected leaves of plants infected with WMV, TuMV, or PVY.

Main Results:

  • Myzus persicae transmitted purified WMV when acquiring it from solutions containing soluble fractions from infected leaves.
  • A WMV-induced helper factor assisted in transmitting purified TuMV but not PVY.
  • TuMV- and PVY-induced helper factors showed specificities, assisting TuMV transmission but not WMV or PVY transmission, respectively.

Conclusions:

  • There are at least three distinct helper factors associated with WMV, TuMV, and PVY.
  • These helper factors exhibit different specificities, influencing the transmission of specific potyviruses by Myzus persicae.
  • The findings contribute to understanding the complex mechanisms of potyvirus transmission.

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