4.黄酮合酶i(flavone synthase i,fns i)和黄烷酮-3-羟化酶(flavanone3β-hydroxylase,f3h)都属于2-酮戊二酸/铁(ii)依赖性双加氧酶(2-oxoglutarate/fe(ii)-dependent dioxygenases,2odds),黄酮合酶i参与黄酮c2和c3位之间双键的形成,是植物黄酮合成的关键酶。黄烷酮-3-羟化酶催化(2s)-黄烷酮生成(2r,3r...