Jona Mata - massive amounts of insecticide that have been...

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Jona Mata AP Bio 3 rd October 19, 2010 ABSTRACT Rooting Out Rootworm Resistance Alfredo Flores and Jan Suszkiw Entomologists Bruce Hibbard, of the Plant Genetics Research Unit or the PGRU in Columbia, Missouri, and Tom Sappington, of the Corn Insects and Crop Genetics Research Unit of Nebraska-Lincoln, and Aaron Gassmann, of Iowa State University, are analyzing the evolution of Bt resistance in WCR to help safeguard this technology for the future. WCR is the western corn rootworm, a highly destructive pest which called for the most amount of insecticide than any other plant pest since its invasion of the 1960’s. WCR is also the most prevalent pest of corn production because of its development of a resistance to the previously successful management tactic of crop rotation. With this predicament, genetically engineered corn, named Bt corn, which produces a toxin protein from Bacillus thurigiensis that acts as insecticide from WCR. These have replaced the
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Unformatted text preview: massive amounts of insecticide that have been used to protect corn from WCR, yet the latter is predicted to acquire resistance to Bt over time, according to lab tests. Also, the WCR, resistant to the protein toxin released by Bt named Cry3Bb1, will be used for the identification of genetic markers with the resistance. To control the evolution, the entomologists used non-Bt plants as refuges which maintain Bt susceptibility in the WCR population. In absence of a refuge, WCR populations developed Bt resistance quickly. The entomologists are also using DNA markers to locate the gene responsible for rotation resistance--egg-laying behavior that enables some rootworm populations to survive rotations of corn with soybean, examining genetic variation and examining gene flow within and between WCR populations....
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