The subject invention concerns Bacillus thuringiensis modified Cry1Ca insecticidal toxins and the polynucleotide sequences which encode these toxins. Uses in transgenic plants are described as are methods for protecting crops from insect pest damage.本標的發明關注蘇力菌(Bacillus thuringiensis)經改質的Cry1Ca殺蟲性毒素及編碼這些毒素的聚核苷酸序列。在轉基因植物中的用途係描述,因為係為保護作物免受蟲害損壞的方法。