Common Receptor for <i>Bacillus thuringiensis</i> Toxins Cry1Ac, Cry1Fa, and Cry1Ja in <i>Helicoverpa armigera</i> , <i>Helicoverpa zea</i> , and <i>Spodoptera exigua</i>

Abstract

Binding studies using (125)I-Cry1Ac and biotinylated Cry1Fa toxins indicate the occurrence of a common receptor for Cry1Ac, Cry1Fa, and Cry1Ja in Helicoverpa armigera, Helicoverpa zea, and Spodoptera exigua. Our results, along with previous binding data and the observed cases of cross-resistance, suggest that this pattern seems to be widespread among lepidopteran species.