Not all ethylene-sensitive flowers are climacteric and produce elevated levels of ethylene during senescence. For example, the daffodil flower is ethylene-sensitive, non-climacteric, and produces only minimal amounts of ethylene throughout its maturation and senescence. Furthermore, repeated treatments of the flower with 1-MCP result in only a very modest increase in longevity which suggests that ethylene is not the primary regulator of its senescence. It appears therefore, that the absence of climacteric ethylene production or respiration is no signature for ethylene insensitivity or vice versa. It seems likely that the relationships among flower senescence, respiration, ethylene production and ethylene sensitivity need to be defined for each new species studied.
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