The levels of aflatoxin B1 in postharvest peanuts were evaluated after inoculation of seeds of four different genotypes : Tatu Vermelho, VRR-245, 2117 e 2155 with Aspergillus flavus IMI 190443. Field trials were conducted in 1995/96 at the Experimenal Center of the Instituto Agronômico de Campinas. The postharvest seeds were used in natura or autoclaved at 121 oC for 20 minutes prior to inoculation with the mold. The aflatoxin B1 was quantified by thin layer chromatography (TLC) using a visual comparation with standards. The levels of aflatoxin B1 in autoclaved and in natura seeds were significantly different (p < 0,05) between the genotypes Tatu Vermelho, VRR-245, 2155 and the 2117. Samples of genotypes 2117, originating from India, presented the lowest levels of aflatoxin B1 irrespective of heating treatment or not, when compared with the others. The results show possibilities of doing explorations about the varietal resistance in the aflatoxin control.
resistance; peanut; aflatoxin B1
