Dynamics of mycotoxin and Aspergillus flavus levels in aging Bt and non-Bt corn residues under Mississippi no-till conditions

Hamed K. Abbas, Cesare Accinelli, Robert M. Zablotowicz, Craig A. Abel, H. Arnold Bruns, Yanhong Dong, W. Thomas Shier

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

Mycotoxin and Aspergillus flavus levels in soil-surface corn debris left by no-till agriculture methods (stover, cobs, and cobs with grain) were determined during the December-March fallow period for near-isogenic Bt and non-Bt hybrid corn. By December, average mycotoxin levels in non-Bt corn were many times higher in cobs with grain than in grain harvested in September (total aflatoxins, 774 vs 211 ng/g; total fumonisins, 216 vs 3.5 μg/g; cyclopiazonic acid, 4102 vs 72.2 μg/g; zearalenone, 0.2 vs < 0.1 μg/g). No trichothecenes were detected. Levels of mycotoxins and A. flavus propagules were ∼10- to 50-fold lower in cobs without grain and stover, respectively, for all mycotoxins except zearalenone. Mycotoxin levels in corn debris fractions decreased during winter but began to rise in March. Levels of all mycotoxins and A. flavus propagules were lower in harvested grain and debris from Bt than non-Bt corn, but differences were significant (p < 0.05) only for aflatoxins.

Original languageEnglish (US)
Pages (from-to)7578-7585
Number of pages8
JournalJournal of agricultural and food chemistry
Volume56
Issue number16
DOIs
StatePublished - Aug 27 2008

Keywords

  • Aflatoxin
  • Aspergillus flavus
  • Bt-corn
  • Crop residues
  • Cyclopiazonic acid
  • Fumonisin
  • Trichothecenes
  • Zearalenone

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