Abstract
The tissue culture process is usually involved in gene transfer and genome editing in plants. Like other species, there is enormous variation among wheat genotypes in tissue culture response. In the rapidly advancing system of CRISPR/Cas9 for genome editing, particle bombardment has received increasing attention as a delivery method for a large amount of nucleic acids and RNA-protein complexes. However, the efficiency of transformation by particle bombardment has been low in wheat, and only a limited number of varieties have been transformed. In this study, replacement of maltose with trehalose as an osmolyte for high osmotic treatment for the protection of tissues from physical impacts improved callus formation in immature wheat embryos and efficiency of transformation and genome editing in varieties that are relatively poor in tissue culture response. The range of varieties amenable to biolistic transformation and genome editing may be expanded by this modification.