Abstract: Pedicels of Lycopersicon esculentum Mill ‘liaoyuanduoli’were harvested at three developmental stages , namely at the anthesis , bud stage and on the tenth day after flower. The abscission sensitivity of pedicels explants induced by ethylene was investigated. The results were showed as following : Anthesis was the stage most liable to shell of pedicels explants induced by ethylene and the optimum concentrate was 20μL·L^-1 . There was a significant increasement in the activity of POD and CMC-Na enzyme in abscission zone , distal side and proximal side of pedicels explants at the end of ethylene treatment in optimum concentrate. However , no clear relationship between the activity of these enzymes and the soluble protein content was observed.

Key words: Tomato, Pedicel, Ethylene, Abscission