Preharvest Aflatoxin Contamination in Drought-Tolerant and Drought-Intolerant Peanut Genotypes

Holbrook, C.C. and Kvien, C.K. and Rucker, K.S. (2000) Preharvest Aflatoxin Contamination in Drought-Tolerant and Drought-Intolerant Peanut Genotypes. Peanut Science, 27 (2). pp. 45-48.

[img] PDF
Restricted to ICRISAT researchers only

Abstract

Peanuts become contaminated with aflatoxins when subjected to prolonged periods of heat and drought stress. The effect of drought tolerance on aflatoxin contamination is not known. The objectives of this research were to evaluate preharvest aflatoxin contamination in peanut genotypes known to have drought tolerance and to determine the correlation of drought tolerance characteristics with aflatoxin contamination. Twenty genotypes with different levels of drought tolerance were grown in Yuma, AZ (a desert environment) and under rain-protected shelters in Tifton, GA. Two drought-tolerant genotypes (PI 145681 and Tifton 8) and an intolerant genotype (PI 196754) were selected for further examination in a second experiment with two planting dates in 1997 at Tifton. 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) in the tests conducted in 1997. Both drought-tolerant genotypes had less preharvest aflatoxin contamination than Florunner in these tests. Significant positive correlations were observed between aflatoxin contamination and leaf temperature and between aflatoxin contamination and visual stress ratings. Leaf temperature and visual stress ratings are less variable and less expensive to measure than aflatoxin contamination. Leaf temperature and visual stress ratings maybe useful in indirectly selecting for reduced aflatoxin contamination in breeding populations

Item Type: Article
Uncontrolled Keywords: Arachis hypogaea, Aspergillus flavus, Aspergillus parasiticus, plant stress
Author Affiliation: Res. Geneticist, USDA-ARS, Coastal Plain Exp. Sta., Tifton, GA31793
Subjects: Plant Protection
Divisions: Groundnut
Depositing User: Ms K Syamalamba
Date Deposited: 16 Nov 2011 09:00
Last Modified: 16 Nov 2011 09:00
Official URL: http://dx.doi.org/10.3146/i0095-3679-27-2-1
URI: http://eprints.icrisat.ac.in/id/eprint/2779

Actions (login required)

View Item View Item
EPrints Logo
eprints is powered by EPrints 3 which is developed by the School of Electronics and Computer Science at the University of Southampton. More information and software credits.