Rehydrated, mature, undamaged seed of 502 peanut (Arachis hypogaea L.) genotypes were scarified, inoculated with an aflatoxigenic strain of Aspergillus flavus Link, and tested for aflatoxin B1 production after incubation at 25 C for 10 days. All genotypes supported production of aflatoxin B1 but significant genotypic differences in levels of aflatoxin B1 production were found. Genotypes U 4–7–5 and VRR 245 supported the lowest levels of aflatoxin B1 (< 10 μg/g seed), whereas the commonly grown Indian cultivar TMV 2 supported production of aflatoxin B1 at levels of over 150 μg/g seed. Eight genotypes with low, moderate or high capacity to support aflatoxin B1 production were further tested using seed from one rainy season crop, and two irrigated postrainy season crops. Genotypic differences in levels of aflatoxin B1 production were consistent over seasons. Production levels were slightly lower in seed from the rainy season crop than in seed from the two postrainy season crops.
1Submitted as Journal Article No. 548 by the International Crops Research Institute for the Semi-Arid Tropical (ICRISAT).