Patent ID: 7560622

Claim:
A method of creating a transgenic maize plant capable of producing a non-transgenic agricultural product, the method comprising, introducing into a maize plant a polynucleotide excision construct flanked by a first pair of recognition sequences, the construct comprising, a first expression cassette comprising a first excision promoter operably linked to a polynucleotide encoding a first sequence-specific DNA cleaving enzyme, wherein the first excision promoter is not constitutive; and a second expression cassette comprising a promoter operably linked to a payload polynucleotide conferring an agronomically important trait on the maize plant; wherein expression of said payload polynucleotide produces a phenotype in said maize plant that is useful or advantageous for food production or food products, and said agronomically important trait is not a hormone biosynthesis gene leading to the production of a plant hormone; and expressing the first sequence-specific DNA cleaving enzyme, thereby cleaving the recognition sequences and excising the excision construct from at least part of the transgenic maize plant and thereby producing a non-transgenic agricultural product in the part of the maize plant wherein said excision occurs.