Preharvest aflatoxin contamination of groundnuts subjected to terminal drought stress in postrainy season |
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Authors: | V K Mehan N Ramakrishna R C Nageswara Rao D McDonald |
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Institution: | 1. Legumes Program, International Crops Research Institute for the Semi-Arid Tropics, Patancheru PO, AP 502 324, India
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Abstract: | Groundnuts grown in the postrainy season under terminal drought stress imposed by withholding irrigation, or under a water-deficit gradient created by line-source sprinkler irrigation, were examined for preharvest aflatoxin contamination. High levels of aflatoxin B1 were found in damaged seeds in both situations. When grown under continuous drought-stress, toxin levels in damaged seed samples ranged from 1480 to 2467 ?g/kg in the 1990/91, and 1.3 to 2000 ?g/kg in the 1991/92 postrainy seasons. Aflatoxin B1 contamination in all damaged seed samples increased with increasing water deficit; toxin levels ranged from 26 to 850 ?g/kg across the water deficit gradient. Aflatoxin was either absent or almost negligible (1–2 ?g/kg) in apparently undamaged seed samples. Low risk of aflatoxin contamination in apparently undamaged seeds of groundnuts grown in postrainy seasons is indicated, even when there is terminal drought stress. |
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