INTEGRATED CONTROL OF PENICILLIUM DIGITATUM BY THE PREDACIOUS YEAST SACCHAROMYCOPSIS CRATAEGENSIS AND SODIUM BICARBONATE ON ORANGES
Brazilian Journal Of Microbiology
INTEGRATED CONTROL OF PENICILLIUM DIGITATUM BY THE PREDACIOUS YEAST SACCHAROMYCOPSIS CRATAEGENSIS AND SODIUM BICARBONATE ON ORANGES
Autor Correspondente: R. S. Pimenta | [email protected]
Palavras-chave: biological control, Saccharomycopsis, Penicillium, postharvest disease, orange
Resumos Cadastrados
Resumo Inglês:
Our investigation of integrated biological control (IBC) started with an assay testing activity of the
predacious yeast Saccharomycopsis crataegensis UFMG-DC19.2 against Penicillium digitatum LCP 4354,
a very aggressive fungus that causes postharvest decay in oranges. Under unfavourable environmental
conditions, the yeast showed a high potential for control (39.9% disease severity reduction) of this fungus.
This result was decisive for the next step, in which S. crataegensis was tested in association with sodium
bicarbonate salt, a generally regarded as safe (GRAS) substance. The yeast was able to survive at different
concentrations of the salt (1%, 2% and 5%), and continued to grow for a week at the wound site, remaining
viable at high population for 14 days on the fruit surface. The yeast alone reduced the severity of decay by
41.7% and sodium bicarbonate alone reduced severity of decay by 19.8%, whereas the application of both
led to a delay in the development of symptoms from 2 to 10 days. Ingredients of the formulations were not
aggressive to fruits since no lesions were produced in control experiments.