Rapid generation of genetic diversity by multiplex CRISPR/Cas9 genome editing in rice

The clustered regularly interspaced short palindromic repeats (CRISPR)-associated endonuclease 9 (CRISPR/Cas9) system has emerged as a promising technology for specific genome editing in many species. Here we constructed one vector targeting eight agronomic genes in rice using the CRISPR/Cas9 multiplex genome editing system. By subsequent genetic transformation and DNA sequencing, we found that the eight target genes have high mutation efficiencies in the T generation. Both heterozygous and homozygous mutations of all editing genes were obtained in T plants. In addition, homozygous sextuple, septuple, and octuple mutants were identified. As the abundant genotypes in T transgenic plants, various phenotypes related to the editing genes were observed. The findings demonstrate the potential of the CRISPR/Cas9 system for rapid introduction of genetic diversity during crop breeding.