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Summary  Recent developments of tools for targeted genome modification have led to new concepts in how multiple traits can be combined. Targeted genome modification is based on the use of nucleases with tailor‐made specificities to introduce a  DNA  double‐strand break ( DSB ) at specific target loci. A re‐engineered meganuclease was designed for specific cleavage of an endogenous target sequence adjacent to a transgenic insect control locus in cotton. The combination of targeted  DNA  cleavage and homologous recombination–mediated repair made precise targeted insertion of additional trait genes ( hppd ,  epsps ) feasible in cotton. Targeted insertion events were recovered at a frequency of about 2% of the independently transformed embryogenic callus lines. We further demonstrated that all trait genes were inherited as a single genetic unit, which will simplify future multiple‐trait introgression.

Targeted molecular trait stacking in cotton through targeted double‐strand break induction