In this study, BA dip treatmentextended vase life of dahlia florets held in CEPA solution (Table 5).This suggests that BA reduces the sensitivity to ethylene in dahliaflorets. Thus, suppression of ethylene response is probably one ofthe factors delaying petal senescence. Moreover, a BA dip treat-ment was more effective in delaying petal senescence than 1-MCP,with or without CEPA (Table 5). Therefore, BA may be effectivein suppressing some factors other than ethylene involved petalsenescence.