An old British movie 'No Blade of Grass' was about seeds that would render similar species via pollen forever sterile thus making extinct barley, rye, wheat or any other grass and grain.

30 years later Monsanto Inc. found a way to make such seeds a reality so that farmers would have to buy Monsanto seeds every year.
It caused normal crops to make sterile seed. Frankenseeds caused terrible trouble in the US along with farm loss. In India these seeds contributed to many farmer suicides.