As an important part of modern biotechnology,genetically modified technology has made great contributions to alleviating resource shortage,increasing food production,protecting ecological environment and expanding agricultural functions.RNA interference(RNAi)is an emerging genetic blocking technology which developed rapidly.In recent years,remarkable achievements have been made in crop pest control and quality improvement,and commercial application has become a reality.Therefore,the research and development status of RNAi-based transgenic crops has attracted more and more attention.In this pap...