参照在拟南芥4-二氢黄酮还原酶基因序列，设计基因专一引物，靶向扩增克隆目的基因片段。

• Using the primer designed from the gene of dihydroflavonol 4-reductase (DFR) in Arabidopsis thaliana, using the genomic DNA of Sichuan yellow Ziyejie as template, we obtained the DFR gene fragment.