The ability to genetically modify a crop. Generally (though not always) you need a tissue culture protocol to regenerate whatever you've transformed into a pla

The ability to genetically modify a crop. Generally (though not always) you need a tissue culture protocol to regenerate whatever you've transformed into a plant (so shoots, roots etc.). Plenty of species are recalcitrant to the transformation itself when using things like agrobacterium or projectile bombardment, or recalcitrant to tissue culturing.