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利用ＰＡＧＥ凝胶电泳对９个大白菜品种子叶期ＥＳＴ同工酶和ＰＯＤ同工酶进行了品种鉴定分析。结果表明，８０－７、山东４号和山东６号可利用ＥＳＴ同工酶酶谱加以区分，小杂５６、山东６号和山东７号可利用ＰＯＤ同工酶酶谱加以区分。单纯利用ＥＳＴ同工酶或ＰＯＤ同工酶不能将供试的９个品种完全鉴别出来。由于ＥＳＴ和ＰＯＤ２种同工酶酶谱综合多态性要比单一的一种同工酶酶谱丰富，将这２种同工酶结合起来，可将供试的９个大白菜品种完全鉴别出来。
PAGE gel electrophoresis of nine Chinese cabbage cotyledon EST EST isozyme and POD isozyme identification analysis. The results showed that EST isozymes of 80-7, Shandong 4 and Shandong 6 could be differentiated by POD isozyme zymogram of Xiaokan 56, Shandong 6 and Shandong 7. The pure use of EST isozymes or POD isozymes can not be tested for the nine varieties completely identified. Because EST and POD2 isozyme zymogram polymorphism is more abundant than a single isoenzyme zymogram, combining these two isoenzymes, the nine Chinese cabbage varieties tested can be completely identified .