Incorporation of two or more major genes in a variety for specific resistance to pathogen is known as

The incorporation of two or more major genes in a variety for specific resistance to pathogens is known as Gene pyramiding.
Gene pyramiding refers to the process of stacking multiple genes into a single genotype to combine desirable traits through recombinant DNA technology or conventional breeding. This approach has resulted in the so-called 'second generation' of GE plants.