Affiliation:
1. Department of Entomology, University of Wisconsin–Madison, Madison, WI 53706 USA.
Abstract
Transgenic plants expressing
Bacillus thuringiensis
(Bt) toxins are currently being deployed for insect control. In response to concerns about Bt resistance, we investigated a toxin secreted by a different bacterium
Photorhabdus luminescens,
which lives in the gut of entomophagous nematodes. In insects infected by the nematode, the bacteria are released into the insect hemocoel; the insect dies and the nematodes and bacteria replicate in the cadaver. The toxin consists of a series of four native complexes encoded by toxin complex loci
tca, tcb, tcc,
and
tcd
. Both
tca
and
tcd
encode complexes with high oral toxicity to
Manduca sexta
and therefore they represent potential alternatives to Bt for transgenic deployment.
Publisher
American Association for the Advancement of Science (AAAS)
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