Electrophoretic analysis of esterase isozyme in tobacco seeds from main varieties cultivated in china, such as G-28, NC89, k326, Honghuadajingyan, Anxun 44 etc were made. The results were shown as follows:The band type of esterase isozymogram in tobacco seeds was very genetically stable. Many band zones, generally 7-10 band zone,could be observed among tobacco varieties. There was a common band pattern of esterase isozymogram in tobacco varieties, while a great variation in band types was observed only in f...