INVESTIGADORES
CHULZE Sofia Noemi
congresos y reuniones científicas
Título:
Aspergillus section Flavi in soils with recent or no history of peanut cultivation
Autor/es:
ORTIZ, M.P; RAMIREZ M.L.; CHULZE , S.N
Lugar:
Villa Carlos Paz
Reunión:
Congreso; VI Congreso Argentino de Microbiologia General; 2009
Institución organizadora:
Sociedad de Microbiologia General (SAMIGE)
Resumen:
The major peanuts-growing region of Argentina is located in the Central-South of Córdoba province. During the last few years the cultivation has been extended to new areas belonging to the Córdoba province and other provinces such as Formosa, and Salta. Many factors, such as phytosanitary problems, climatic conditions and soil degradation have contributed to explain this expansion of peanuts cultivation to new areas. Peanuts is often invaded before harvest by Aspergillus section Flavi, A. flavus and A. parasiticus, these species can produce the carcinogenic aflatoxins. Soil is the main reservoir of the inoculum of both species and peanut pods can be contaminated with the toxigenic species. At the present, there is information about soil population of Aspergillus section Flavi the traditional peanut growing region. The aim of this work was extend the knowledge on these populations from new areas with recent o no history of peanut cultivation. Soil samples were obtained from fields located in the south of Córdoba province and Formosa. The results showed that soil densities of combined Aspergillus species from section Flavi were characterized by large variation among fields, with a lowest frequency on the fields without peanuts history. Aspergillus flavus was the dominant specie in all the fields. Aspergillus parasiticus was found in low frequency, mainly in fields with recent peanuts cultivation history (2-3 years). There were not significant differences in the ratio of toxicogenic and atoxicogenic strains but it was found the lower percentage of toxicogenic strains on the field with no/or recent history of peanuts cultivation. The results are relevant in order to evaluate the risk of peanuts to be contaminated with aflatoxins under conductive conditions.