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Article Dans Une Revue Philosophical Transactions of the Royal Society B: Biological Sciences Année : 2010

The virulence-transmission trade-off in vector-borne plant viruses: a review of (non-)existing studies

R Froissart
J Doumayrou
  • Fonction : Auteur
F Vuillaume
  • Fonction : Auteur
Samuel Alizon
Y Michalakis

Résumé

The adaptive hypothesis invoked to explain why parasites harm their hosts is known as the trade-off hypothesis, which states that increased parasite transmission comes at the cost of shorter infection duration. This correlation arises because both transmission and disease-induced mortality (i.e. virulence) are increasing functions of parasite within-host density. There is, however, a glaring lack of empirical data to support this hypothesis. Here, we review empirical investigations reporting to what extent within-host viral accumulation determines the transmission rate and the virulence of vector-borne plant viruses. Studies suggest that the correlation between within-plant viral accumulation and transmission rate of natural isolates is positive. Unfortunately, results on the correlation between viral accumulation and virulence are very scarce. We found only very few appropriate studies testing such a correlation, themselves limited by the fact that they use symptoms as a proxy for virulence and are based on very few viral genotypes. Overall, the available evidence does not allow us to confirm or refute the existence of a transmission-virulence trade-off for vector-borne plant viruses. We discuss the type of data that should be collected and how theoretical models can help us refine testable predictions of virulence evolution.

Dates et versions

hal-01567933 , version 1 (24-07-2017)

Identifiants

Citer

R Froissart, J Doumayrou, F Vuillaume, Samuel Alizon, Y Michalakis. The virulence-transmission trade-off in vector-borne plant viruses: a review of (non-)existing studies. Philosophical Transactions of the Royal Society B: Biological Sciences, 2010, 365 (1548), pp.1907-18. ⟨10.1098/rstb.2010.0068⟩. ⟨hal-01567933⟩
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