Combining genetic engineering and traditional breeding to provide elevated resistance in potatoes to Colorado potato beetle

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Abstract
The sustainable deployment of resistant crop varieties is a critical issue for the implementation of biotechnology in crop pest management. Feeding, biomass accumulation, and mortality were evaluated for susceptible, insecticide‐resistant, andBacillus thuringiensis(Bt) Cry 3A‐selected Colorado potato beetle (Leptinotarsa decemlineataSay) (Coleoptera, Chrysomelidae) larvae fed on: cultivated potato, aSolanum chacoenseline expressing leptine glycoalkaloids, a transformed line expressing Bt toxin, or the leptine line transformed to express Bt toxin. Larvae selected for resistance to Bt‐Cry3A performed better on Bt foliage, but not as well on the leptine foliage, compared to susceptible or insecticide‐resistant larvae. Neither leptine nor Bt toxin completely inhibited the feeding and growth of 3rd and 4th instars of all three strains of Colorado potato beetle. However, for all three strains of Colorado potato beetle on leptine + Bt foliage, feeding was almost zero, growth was zero or negative, and mortality was near 100%.

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