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Applied and Environmental Microbiology, October 2008, p. 6327-6332, Vol. 74, No. 20
0099-2240/08/$08.00+0     doi:10.1128/AEM.01200-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Genetic Structure and Aggressiveness of Erysiphe necator Populations during Grapevine Powdery Mildew Epidemics {triangledown}

Josselin Montarry,* Philippe Cartolaro, François Delmotte, Jérôme Jolivet, and Laetitia Willocquet

INRA, Institut des Sciences de la Vigne et du Vin de Bordeaux, UMR1065 Santé Végétale (INRA-ENITAB), F-33883 Villenave d'Ornon, France

Received 30 May 2008/ Accepted 11 August 2008

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.

* Corresponding author. Mailing address: INRA, ENITA, UMR1065 Santé Végétale, F-33883 Villenave d'Ornon, France. Phone: (33) (0)5 57 12 26 38. Fax: (33) (0)5 57 12 26 21. E-mail: Josselin.Montarry{at}bordeaux.inra.fr

{triangledown} Published ahead of print on 22 August 2008.

Applied and Environmental Microbiology, October 2008, p. 6327-6332, Vol. 74, No. 20
0099-2240/08/$08.00+0     doi:10.1128/AEM.01200-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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