Bt toxin is released in root exudates from 12 transgenic corn hybrids representing three transformation events

D. Saxena, S. Flores, G. Stotzky

Research output: Contribution to journalArticlepeer-review

Abstract

The anti-lepidopteran toxin (Cry1Ab protein) encoded by truncated genes from Bacillus thuringiensis was released in the root exudates from all hybrids of Bt corn studied and which represented three transformation events (Bt11, MON810, and 176). In vitro and in situ studies indicated that the toxin released in root exudates accumulates in soil, as it adsorbs and binds rapidly on surface-active particles (e.g. clays and humic substances), and retains insecticidal activity for at least 180 d, the longest time studied. The results indicated that the release of the Cry1Ab protein by roots is a common phenomenon with transgenic Bt corn and is not restricted to only the one Bt corn hybrid (NK4640Bt) and tranformation event (Bt11) studied initially.

Original languageEnglish (US)
Pages (from-to)133-137
Number of pages5
JournalSoil Biology and Biochemistry
Volume34
Issue number1
DOIs
StatePublished - 2002

Keywords

  • Bacillus thuringiensis
  • Bt corn
  • Clay
  • Cry1Ab toxin
  • European corn borer
  • Humic acids
  • Root exudates

ASJC Scopus subject areas

  • Microbiology
  • Soil Science

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