The longevity in 0.4 ~1.1~’ ethylene of cut carnations
pre-treated with 1 -MCP increased with increasing pretreatment
concentration (Fig. 1). Calculation of the
asymptote of the curve indicated that 90% of possible
longevity would be achieved with a pre-treatment of
10-20 nl.l-t. Pre-treatment of snapdragon and penstemon
flowers with 1 -MCP up to 20 nl.l- ’ confirmed
this hypothesis (Fig. 2). The inhibitory effect of l-MCP
appeared to plateau at a pre-treatment concentration of
20 nl.l-‘.