Submitted to: International Crop Science Congress Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 3/15/2004
Publication Date: 11/15/2004
Citation: Holbrook, C.C., Guo, B., Wilson, D.M., and Kvien, C.K. 2004. Effect of drought tolerance on preharvest aflatoxin contamination in peanut. Proceedings of 4th International Crop Science Congress, Sept. 26-Oct. 1, 2004, Queensland, Australia. Interpretive Summary: not required
Technical Abstract: Peanuts become contaminated with aflatoxins when subjected to prolonged periods of heat and drought stress. The objective of this research was to evaluate the effect of drought tolerance on preharvest aflatoxin contamination (PAC). Two drought-tolerant genotypes (PI 145681 and Tifton 8) and an intolerant genotype (PI 196754) were evaluated in two studies using rain-protected shelters in Tifton, Georgia, USA. Drought and heat stress conditions were imposed for the 40 d preceding harvest. The drought-intolerant genotype had greater preharvest aflatoxin contamination than Florunner, the check cultivar. Both drought-tolerant genotypes had less preharvest aflatoxin contamination than Florunner in these tests. We are using drought-tolerance as an indirect selection technique to develop peanut cultivars that are less susceptible to preharvest aflatoxin contamination This has resulted in late generation breeding lines that have high relative yield and low relative aflatoxin contamination when subjected to late season heat and drought stress.