Patent ID: 8017829

Claim:
A method for producing a compound, said method comprising the steps of producing a fertile transgenic plant by introducing into plant cells a DNA construct comprising a promoter, a blocking sequence, and a coding sequence of a structural gene coding for a compound that is detrimental to the plant and is commercially valuable, said blocking sequence being flanked by a pair of directly repeated site-specific recombination sequences and wherein the coding sequence is operably linked to the promoter only after the removal of said blocking sequence, and culturing the plant cells to produce the fertile transgenic plant; self-pollinating said transgenic plant to produce transgenic plants that are homozygous for the DNA construct; crossing said transgenic plant homozygous for the DNA construct with a plant having a DNA sequence comprising a coding region encoding a site-specific recombinase that recognizes said site-specific recombination sequences to produce an F1 plant or seed; expressing the site-specific recombinase in the F1 plant or seed; expressing the compound; and extracting the compound in economical quantities.