Preharvest seed infection byAspergillus flavus group fungi and subsequent aflatoxin contamination in groundnuts in relation to soil types

Mehan, V K and Mayee, C D and Jayanthi, S and McDonald, D (1991) Preharvest seed infection byAspergillus flavus group fungi and subsequent aflatoxin contamination in groundnuts in relation to soil types. Plant and Soil, 136 (2). pp. 239-248. ISSN 0032-079X

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Abstract

Preharvest seed infection byAspergillus flavus and aflatoxin contamination in selected groundnut genotypes (fourA. flavus-resistant and fourA. flavus-susceptible) were examined in different soil types at several locations in India in 1985–1990. Undamaged mature pods were sampled at harvest and seed examined forA. flavus infection and aflatoxin content in two or more trials at ICRISAT Center on light sandy soils and red sandy loam soils (Alfisols), and on Vertisols, at Anantapur on light sandy soils, and at Dharwad and Parbhani on Vertisols. Rainy season trials (1985–1989) were all rainfed. Post-rainy season trials were irrigated; late-season drought stress (90 days after sowing (DAS) until harvest at 125 DAS) was imposed in the 1987/88 and 1989/90 seasons.A. flavus infection and aflatoxin contamination levels were much lower in seed of all genotypes from Vertisols than in seed from Alfisols across locations and seasons. Vertisols also had significantly lower populations ofA. flavus than Alfisols. There were no marked differences between light sandy soils and red sandy loam soils (Alfisols) in respect of seed infection byA. flavus and aflatoxin contamination. Significant interactions between genotypes and soil types were evident, especially in theA. flavus-susceptible genotypes. Irrespective of soil types,A. flavus-resistant genotypes showed lower levels of seed infection byA. flavus and other fungi than didA. flavus-susceptible genotypes. The significance of the low preharvest aflatoxin risk in groundnuts grown on Vertisols is highlighted

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Arachis hypogaea - Aspergillus flavus - A. parasiticus - seed infection - Vertisols
Subjects:	Mandate crops > Groundnut
Depositing User:	Ms K Syamalamba
Date Deposited:	17 Nov 2011 10:18
Last Modified:	17 Nov 2011 10:18
URI:	http://oar.icrisat.org/id/eprint/4022
Official URL:	http://dx.doi.org/10.1007/BF02150055
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	The authors are grateful to Mr V R Prabhakar, Statistics Unit, ICRISAT, for providing advice and assistance in the statistical analysis
Links:	Author

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