Effects of soil moisture and temperature on preharvest invasion of peanuts by the Aspergillus flavus group and subsequent aflatoxin development

Hill, R.A and Blankenship, P.D. and Cole, R.J. and Sanders, T.H. (1983) Effects of soil moisture and temperature on preharvest invasion of peanuts by the Aspergillus flavus group and subsequent aflatoxin development. Applied and Environmental Microbiology, 45 (2). pp. 628-633.

[img] PDF - Published Version
Restricted to ICRISAT researchers only

Abstract

Four soil temp. and moisture treatment regimens were imposed on Florunner groundnuts 94 days after planting in test plots in 1980. At harvest (145 days after planting) incidence of A. flavus group and aflatoxin conc. were greatest in damaged kernels. Extensive colonization of sound mature kernels (SMK) by the group occurred in the drought plot (56% kernels colonized), followed by the irrigated plot with heated soil (26%), the drought stress plot with cooled soil (11%) and the irrigated plot (7%). Aflatoxin was almost absent from SMK with the last 3 treatments, but was at an av. conc. of 244 p.p.b. (ng/g) in drought-stressed SMK. Colonization of SMK by A. flavus and aflatoxin production were greater under hot dry conditions. Neither elevated temp. alone nor drought stress alone caused aflatoxin contamination in SMK. When the ratio of SMK colonized by A. flavus compared with A. niger was > 19:1, there was aflatoxin contamination but there was none if the ratio was < 9:1. Irrigation caused a higher incidence of A. niger than did drought, which may have prevented the aflatoxin contamination of undamaged groundnuts.

Item Type: Article
Additional Information: SNNigam Collection
Uncontrolled Keywords: Peanut, Aspergillus flavus, Aflatoxin, Harvesting, Shelling.
Author Affiliation: Dep. Plant Path., Univ. Georgia, Georgia Coastal Plain Exp. Sta., Tifton, Ga. 31793, USA.
Subjects: Plant Protection
Crop Improvement
Divisions: Groundnut
Depositing User: Mr Balakrishna Garadasu
Date Deposited: 02 Apr 2013 04:45
Last Modified: 02 Apr 2013 04:45
URI: http://eprints.icrisat.ac.in/id/eprint/9955

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.