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Genetic structure and aggressiveness of Erysiphe necator populations during grapevine powdery mildew epidemics.

Authors
  • Montarry, Josselin
  • Cartolaro, Philippe
  • Delmotte, François
  • Jolivet, Jérôme
  • Willocquet, Laetitia
Type
Published Article
Journal
Applied and Environmental Microbiology
Publisher
American Society for Microbiology
Publication Date
Oct 01, 2008
Volume
74
Issue
20
Pages
6327–6332
Identifiers
DOI: 10.1128/AEM.01200-08
PMID: 18723657
Source
Medline
License
Unknown

Abstract

Isolates of the causal ascomycete of grapevine powdery mildew, Erysiphe necator, correspond to two genetically differentiated groups (A and B) that coexist on the same host. This coexistence was analyzed by investigating temporal changes in the genetic and phenotypic structures of E. necator populations during three epidemics. Group A was present only at the start of the growing season, whereas group B was present throughout all three epidemics. Group A was less aggressive in terms of germination and infection efficiency but was more aggressive than group B in terms of the latency period, lesion diameter, and spore production. Our results are consistent with a temporal differentiation of niches, preventing recombination, and suggest an association between the disease level and the frequencies of genetic groups.

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