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Application of a model to assess aflatoxin risk in peanuts

Published online by Cambridge University Press:  02 February 2010

Y. S. CHAUHAN ,
G. C. WRIGHT ,
R. C. N. RACHAPUTI ,
D. HOLZWORTH ,
A. BROOME ,
S. KROSCH  and
M. J. ROBERTSON
Y. S. CHAUHAN*
Affiliation:
Department of Employment, Economic Development and Innovation (DEEDI), P.O. Box 23, Kingaroy, Queensland4610, Australia
G. C. WRIGHT
Affiliation:
Peanut Company of Australia, P.O. Box 26, Kingaroy, Queensland4610, Australia
R. C. N. RACHAPUTI
Affiliation:
Department of Employment, Economic Development and Innovation (DEEDI), P.O. Box 23, Kingaroy, Queensland4610, Australia
D. HOLZWORTH
Affiliation:
CSIRO, P.O. Box 102, Toowoomba, Queensland4350, Australia
A. BROOME
Affiliation:
Department of Employment, Economic Development and Innovation (DEEDI), P.O. Box 23, Kingaroy, Queensland4610, Australia
S. KROSCH
Affiliation:
Department of Employment, Economic Development and Innovation (DEEDI), P.O. Box 23, Kingaroy, Queensland4610, Australia
M. J. ROBERTSON
Affiliation:
CSIRO, Private Bag 5, P.O.Wembley, WA6913, Australia
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

When exposed to hot (22–35°C) and dry climatic conditions in the field during the final 4–6 weeks of pod filling, peanuts (Arachis hypogaea L.) can accumulate highly carcinogenic and immuno-suppressing aflatoxins. Forecasting of the risk posed by these conditions can assist in minimizing pre-harvest contamination. A model was therefore developed as part of the Agricultural Production Systems Simulator (APSIM) peanut module, which calculated an aflatoxin risk index (ARI) using four temperature response functions when fractional available soil water was <0·20 and the crop was in the last 0·40 of the pod-filling phase. ARI explained 0·95 (P⩽0·05) of the variation in aflatoxin contamination, which varied from 0 to c. 800 μg/kg in 17 large-scale sowings in tropical and four sowings in sub-tropical environments carried out in Australia between 13 November and 16 December 2007. ARI also explained 0·96 (P⩽0·01) of the variation in the proportion of aflatoxin-contaminated loads (>15 μg/kg) of peanuts in the Kingaroy region of Australia during the period between the 1998/99 and 2007/08 seasons. Simulation of ARI using historical climatic data from 1890 to 2007 indicated a three-fold increase in its value since 1980 compared to the entire previous period. The increase was associated with increases in ambient temperature and decreases in rainfall. To facilitate routine monitoring of aflatoxin risk by growers in near real time, a web interface of the model was also developed. The ARI predicted using this interface for eight growers correlated significantly with the level of contamination in crops (r=0·95, P⩽0·01). These results suggest that ARI simulated by the model is a reliable indicator of aflatoxin contamination that can be used in aflatoxin research as well as a decision-support tool to monitor pre-harvest aflatoxin risk in peanuts.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 148 , Issue 3 , June 2010 , pp. 341 - 351
Copyright
Copyright © The State of Queensland, Australia 2010

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