European Journal of Plant Pathology

, Volume 129, Issue 2, pp 315–329 | Cite as

Diversity and fitness of Plasmopara viticola isolates resistant to QoI fungicides

  • Marie-France Corio-CostetEmail author
  • Marie-Cécile Dufour
  • Jérémy Cigna
  • Pierre Abadie
  • Wei-Jen Chen


The effectiveness of Quinone outside Inhibitor (QoI) fungicides against grape downy mildew in European vineyards has significantly decreased in the last decade. One nucleotide polymorphism, G143A in the cytochrome b gene of Plasmopara viticola, is involved in resistance to QoIs. Previous genetic examination on the mitochondrial genomes showed four major haplotypes (IR, IS, IIR, IIS) coexisting in European vineyards. A resistant allele (G143A) was present in IR and IIR haplotypes. The purpose of the present study was to estimate the diversity of the different mitochondrial haplotypes and their distribution in QoI-resistant populations before evaluating the potential cost of the resistant mutation G143A in P. viticola population. From 2000 to 2004, the frequencies of resistant isolates ranged from 0% to 23.25% with an average of 4.64 % among the populations examined. To evaluate the fitness of sensitive and resistant isolates, a comparison of different biological parameters including latent period, spore production and infection frequency was performed, enabling a fitness index (FI) to be determined. Resistant isolates exhibited greater infection frequency than sensitive isolates, whereas no significant difference was found in sporulation ability and latent period between sensitive and resistant isolates. To further investigate competitiveness among isolates, an assay including two resistant isolates in different proportion with a sensitive isolate was conducted on eight asexual growing cycles in the absence of a QoI fungicide. The competitiveness of resistant isolates varied according to their fitness parameters, suggesting that there is no noticeable cost of QoI resistance in controlled conditions in Plasmopara viticola.


Cytochrome b Fitness Fungicide resistance Grapevine downy mildew Mitochondrial variability qPCR 



Cleaved Amplified Polymorphic Sequence


fitness index


Quinone outside Inhibitor


Amplification refractory mutation system


Single Nucleotide Polymorphisms



We thank D. Gobbin and colleagues from IFV for their help in sampling of the collection and Aquitaine Region Government for their financial support. We thank S. Gambier, S. Richart-Cervera, and L. Douence for technical support. We thank J-L. Genet from Dupont Protection for the gift of famoxadone.


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Copyright information

© KNPV 2010

Authors and Affiliations

  • Marie-France Corio-Costet
    • 1
    Email author
  • Marie-Cécile Dufour
    • 1
  • Jérémy Cigna
    • 1
  • Pierre Abadie
    • 2
  • Wei-Jen Chen
    • 3
  1. 1.UMR Santé Végétale, 1065, ISVV, IFR 103INRAVillenave d’OrnonFrance
  2. 2.UMR 1202 BIOGeCo, Laboratoire de génétique des arbres forestiersINRACestasFrance
  3. 3.Institute of OceanographyNational Taiwan UniversityTaipeiTaiwan

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