Biocontrol activity of three Pseudomonas in a newly assembled collection of Phytophthora infestans isolates
- De Vrieze, Mout Department of Biology, University of Fribourg, Chemin du Musée 10, CH-1700 Fribourg, Switzerland - Research Division Plant Protection, Agroscope, Route de Duillier 60, CH-1260 Nyon, Switzerland
- Gloor, Ramona Research Division Plant Protection, Agroscope, Route de Duillier 60, CH-1260 Nyon, Switzerland - Syngenta Crop Protection AG, Schaffhauserstrasse 101, CH-4332 Stein, Switzerland
- Massana Codina, Josep Research Division Plant Protection, Agroscope, Route de Duillier 60, CH-1260 Nyon, Switzerland
- Torriani, Stefano Syngenta Crop Protection AG, Schaffhauserstrasse 101, CH-4332 Stein, Switzerland
- Gindro, Katia Research Division Plant Protection, Agroscope, Route de Duillier 60, CH-1260 Nyon, Switzerland
- L'Haridon, Floriane Department of Biology, University of Fribourg, Chemin du Musée 10, CH-1700 Fribourg, Switzerland
- Bailly, Aurélien Department of Plant and Microbial Biology, University of Zürich, Zollikerstrasse 107, CH-8008 Zurich, Switzerland
- Weisskopf, Laure Department of Biology, University of Fribourg, Chemin du Musée 10, CH-1700 Fribourg, Switzerland
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01.05.2019
Published in:
- Phytopathology. - 2019, vol. 109, no. 9, p. 1555–1565
English
Late blight caused by the oomycete Phytophthora infestans constitutes the greatest threat to potato production worldwide. Considering the increasing concerns regarding the emergence of novel fungicide-resistant genotypes and the general demand for reducing inputs of synthetic and copper-based fungicides, the need for alternative control methods is acute. Several bacterial antagonists have shown anti-Phytophthora effects during in vitro and greenhouse experiments. We report the effects of three Pseudomonas strains recovered from field-grown potatoes against a collection of P. infestans isolates assembled for this study. The collection comprised 19 P. infestans isolates of mating types A1 and A2 greatly varying in fungicide resistance and virulence profiles as deduced from leaf disc experiments on Black’s differential set. The mycelial growth of all P. infestans isolates was fully inhibited when co-cultivated with the most active Pseudomonas strain (R47). Moreover, the isolates reacted differently to exposure to the less active Pseudomonas strains (S19 and R76). Leaf disc infection experiments with six selected P. infestans isolates showed that four of them, including highly virulent and fungicide-resistant ones, could be efficiently controlled by different potato-associated Pseudomonas strains.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Biologie
- Language
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- English
- Classification
- Biological sciences
- License
- License undefined
- Identifiers
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- RERO DOC 327390
- DOI 10.1094/PHYTO-12-18-0487-R
- Persistent URL
- https://folia.unifr.ch/unifr/documents/308172
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