对6种不同种类榛树叶中过氧化物酶（POD）同工酶测定比较的结果显示：平榛、毛榛及杂交榛共有酶带B4，该酶带可能是榛属的特征性酶带；
To peroxides isozyme analysis in leaves of 6 species hazelnut trees , the results show that existing enzyme belt B 4 in Corylus heterophylla , C. mandshurica and cross hazelnut ( Corylus heterophylla ♀× C.avellana ♂) .
毛榛