DESPREZ LOUSTAU, Marie Laure; MASSOT, Marie; FEAU, Nicolas; FORT, Tania; DE VICENTE, Antonio; TORÉS, Juan Antonio; ORTUÑO, Dolores Fernández

doi:10.1094/PDIS-01-17-0116-RE

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DESPREZ LOUSTAU, Marie Laure
Biodiversité, Gènes & Communautés [BioGeCo]

MASSOT, Marie
Biodiversité, Gènes & Communautés [BioGeCo]

FEAU, Nicolas
Department of Forest and Conservation Sciences, British Columbia

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Article de revue

Ce document a été publié dans

Plant Disease. 2017, vol. 101, n° 7, p. 1086-1093

American Phytopathological Society

Résumé en anglais

Mango leaves and inflorescences infected by powdery mildew in southern Spain were analyzed using multigene sequencing (ITS + 4 single-copy coding genes) to identify the causal agent. Erysiphe quercicola was detected in 97% out of 140 samples, collected in six different orchards in the Malaga region. Among these, a small proportion also yielded E. alphitoides (8% of all samples) and E. alphitoides was found alone in 3% of samples. A phylogenetic approach was completed by cross inoculations between oak and mango, which led to typical symptoms, supporting the conspecificity of oak and mango powdery mildews. To our knowledge, this is the first report of E. quercicola and E. alphitoides causing powdery mildew on mango trees in mainland Spain, and thus mainland Europe, based on unequivocal phylogenetic and biological evidence. Our study thus confirmed the broad host range of both E. quercicola and E. alphitoides. These results have practical implications in terms of the demonstrated ability for host range expansion in powdery mildews. They also open interesting prospects to the elucidation of molecular mechanisms underlying the ability to infect single versus multiple and unrelated host plants since these two closely related powdery mildew species belong to a small clade with both generalist and specialist powdery mildews.< Réduire

Mots clés

mangue

erysiphe

oïdium

espagne

séquençage de gènes

Mots clés en anglais

mangoes

powdery mildew

DOI

http://dx.doi.org/10.1094/PDIS-01-17-0116-RE

Project ANR

Expression du génome chloroplastique: protéines OPR et complexes ribonucléoprotéiques. - ANR-13-BSV7-0001

Origine

Importé de hal

Unités de recherche

BioGeCo (Biodiversité Gènes & Communautés) - UMR 1202