2-Hydroxyisoflavanone synthase substantially having the amino acid
sequence represented by SEQ ID NO:2 and a polynucleotide substantially
having the nucleotide sequence of SEQ ID NO:1. Thus,
2-hydroxyisoflavanone synthase can be expressed in a host cell. By
transferring the polynucleotide encoding 2-hydroxyisoflavanone synthase
into a plant cell, a plant having an altered isoflavone productivity can
be obtained.