Metabolites produced by antagonistic microbes inhibit the principal avocado pathogens in vitro

The demand for Hass avocado in the global market exceeds the supply by over 50%. Colombia has a remarkable advantage as a producer in the region due to its high yields. However, the productivity of this crop can be seriously affected by diseases such as root rot, caused by Phytophthora cinnamomi,  p...

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Autores:
Ramírez R., Sara
Arias M., Julián David
Bedoya, Juan Carlos
Rueda L., Ever Antoni
Sánchez, Claudia Yaneth
Granada G., Sinar David
Tipo de recurso:
Article of journal
Fecha de publicación:
2015
Institución:
Universidad Nacional de Colombia
Repositorio:
Universidad Nacional de Colombia
Idioma:
spa
OAI Identifier:
oai:repositorio.unal.edu.co:unal/58500
Acceso en línea:
https://repositorio.unal.edu.co/handle/unal/58500
http://bdigital.unal.edu.co/55283/
Palabra clave:
57 Ciencias de la vida; Biología / Life sciences; biology
58 Plantas / Plants
Persea americana
postharvest diseases
Phytophthora cinnamomi
secondary metabolites
rhizobacteria
Rights
openAccess
License
Atribución-NoComercial 4.0 Internacional
Description
Summary:The demand for Hass avocado in the global market exceeds the supply by over 50%. Colombia has a remarkable advantage as a producer in the region due to its high yields. However, the productivity of this crop can be seriously affected by diseases such as root rot, caused by Phytophthora cinnamomi,  postharvest body rot and stem end rot, caused by Colletotrichum sp. and Phomopsis sp., respectively. The potential of 76 bacterial isolates obtained from avocado rhizosphere to produce inhibitory metabolites against avocado´s pathogens was evaluated. The antagonistic effect of the rhizobacteria against P. cinnamomi, Colletotrichum sp. and Phomopsis sp. was tested through dual cultures. Thirty-six percent of the tested isolates presented inhibition halos against P. cinnamomi, 36% against Colletotrichum sp. and 67% against Phomopsis sp. Additionally, three isolates were selected for fermentation tests using different broth cultures. The extracts obtained from fermentations in the minimal medium of isolates ARP5.1 and AED06 showed inhibitory activity against the evaluated pathogens, but this effect was not observed with the AED26 extract. The media supplemented with copper chloride did not enhance activity of the extracts. These results suggest that using microbial metabolic extracts is a viable alternative for controlling avocado pathogens in vitro.