The toxin gene in different strains of B. thuringiensis can affect different mixes of insects, so seed makers can select the version that seems best suited to a particular crop.

• 例如说，“环保科学家协会”的梅隆指出，耐盐稻米一旦落到湿地上，可能会像野草般蔓延，破坏脆弱的湿地生态系。