Promising directions for research

For potato, the next step is to enhance the durability of genetic resistance to the potato tuber moth by engineering a second Bt gene for insertion into the existing transgenic Bt varieties. This work follows on known biotechnological methods and proven success.

In addition, work needs to be done to develop insect resistance management strategies suitable for resource-poor farmers in developing countries. At the same time, there is a need to study the ecological impact of potato tuber moth resistant potatoes on naturally occurring insects in specific environments. As new transgenic Bt varieties are developed, they must be introduced in target regions following appropriate biosafety regulations and protocols.

Following the success of Bt genes used for potato, it should be possible to introduce the appropriate Bt gene to transform the most accepted sweetpotato varieties in Sub-Saharan Africa. Still, the Bt genes suitable for sweetpotato weevil need to be discovered. CIP scientists believe that such genes exist in nature and that the technology used for potato could be applied to sweetpotato. Future research can be directed to identify, isolate, and modify genes, and to introduce those that are effective against sweetpotato weevils into farmers’ preferred varieties. Success in this area would not only represent a breakthrough for science, but would provide a tangible and productive resource for farmers.

Research on transgenic Bt varieties has good potential to improve both potato and sweetpotato production in developing countries. For resource-poor farmers with little access to pesticides, their crop production would be more secure than ever before. In addition, through less use of insecticides, farmers will confront less risk to their health, as well as avoiding damage to the environment.

A CIP scientist checks fingerprinting of potato DNA on a computer monitor. The face screen protects scientists from ultraviolet light used to illuminate DNA gels.