Flax fatty acid desaturase gene and its application

The present invention relates to linseed fatty acid capable of expressing in a mammal dehydrogenase gene (FAD3) and its application, comprising the gene of SEQ? ID? NO.1 nucleotide sequence or a nucleotide sequence complementary thereto. Linseed fatty acid dehydrogenase gene sequences of the present invention can promote the intracellular conversion of fatty acids to n-6 fatty acid 3 n-.