Crop improvement is essential to attaining world food security and enhancing nutrition for human beings. Both conventional breeding and modern molecular breeding have contributed to increased crop production and quality. However, the time and resources for breeding practices have been limited. It takes a long time to bring a novel improved crop to the market, and the genetic sources from wild species cannot be always available for crops of our interests. Genome editing technology implemented molecular breeding can overcome those limitations of time and resource by facilitating the specific editing of plant genomes. However, there is a long-lasting argument about the safety of genetically modified organisms (GMOs). In this review, we briefly summarize the principle of genome editing tools, focusing on the CRISPR/Cas9 system and the application of these tools to plants in the service of crop engineering.

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