Engineered <i>Bt</i> toxins may counter resistance
An international team of researchers led by Professor Bruce Tabashnik from the US Arizona University (Tucson) has developed modified Bt toxins that are up to 350 times more effective against some target pests than natural toxins. The researchers produced modified forms of the Bt endotoxins, Cry1Ab and Cry1Ac. Cry1Ab is employed in the genetically modified cotton lines, COT67B and T304-40, and the BT11 and MON810 maize events. Cry1Ac is used in the DAS21023, MON531 and MON15985 cotton events, MON88017 maize and MON87701 soybeans.