In vitro assessment of the effect of mefenoxam-acquired resistance on sporulation in isolates of phytophthora infestans

Phytophthora infestans is an oomycete pathogen that causes potato and tomato late blight disease, a worldwide concern for farmers given its explosive epidemic potential. In order to control the disease, an integral management approach, which includes the use of fungicides, has been implemented. Unfo...

Full description

Autores:
Regnier Casasfranco, Melissa
Tipo de recurso:
Trabajo de grado de pregrado
Fecha de publicación:
2017
Institución:
Universidad de los Andes
Repositorio:
Séneca: repositorio Uniandes
Idioma:
eng
OAI Identifier:
oai:repositorio.uniandes.edu.co:1992/39852
Acceso en línea:
http://hdl.handle.net/1992/39852
Palabra clave:
Phytophthora infestans
Fungicidas sistémicos
Papas (Tubérculos)
Tomates
Plantas
Microbiología
Rights
openAccess
License
http://creativecommons.org/licenses/by-nc-sa/4.0/
Description
Summary:Phytophthora infestans is an oomycete pathogen that causes potato and tomato late blight disease, a worldwide concern for farmers given its explosive epidemic potential. In order to control the disease, an integral management approach, which includes the use of fungicides, has been implemented. Unfortunately, populations of P. infestans resistant to fungicides have been documented. Furthermore, studies have shown that isolates of P. infestans are able to acquire resistance to mefenoxam in vitro, after a single exposure through sub-lethal concentrations of this widely used fungicide. The aim of this study was to evaluate if there is an effect on sporangial production in isolates of P. infestans that acquire resistance to mefenoxam in vitro. An originally susceptible isolate of P. infestans was exposed to different concentrations of mefenoxam-amended media and compared to a resistant control. Sporangia production was significantly diminished in isolates that acquired resistance. Interestingly, naturally resistant isolates sporulated significantly more in the presence of mefenoxam. Possible implications of the acquisition of resistance on sporangia production are discussed. These results provide further insights into the phenomenon of mefenoxam-acquired resistance