Effect of 1-MCP on the post-harvest performance of unrooted poinsettia cuttings.
Faust J.E., Lewis K.P.
5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004
2004
บทคัดย่อ
Effect of 1-MCP on the post-harvest performance of unrooted poinsettia cuttings.
Unrooted poinsettia (Euphorbia pulcherima ‘Eckespoint Freedom’) cuttings were placed into plastic bags at 10, 18, and 26 °C for 72 h.1-MCP was placed into one half of the bags at each temperature, while the other half served as a control.Ethylene concentrations inside the bag were measured at 0, 12, 24, 48, and 72 h.The cuttings were placed on a propagation bench following 72 h of storage and leaf senescence was recorded over the following week.In the control packages (without 1-MCP), the ethylene concentration measured at 48 h increased from 0 to 0.3 ppm as the temperature increased from 10 to 26 °C.In the packages containing 1-MCP, the ethylene concentration measured at 48 h increased from 0 to 1.8 ppm at the temperature increased from 10 to 26 °C.Therefore, no ethylene was produced by the cuttings at 10 °C, and 1-MCP resulted in higher ethylene concentrations in the packages as temperature increased from 10 to 26 °C, while 1-MCP treated cuttings had 0.3 abscised leaves per cutting.A follow-up experiment was conducted in which ten poinsettia cultivars were placed in commercial packages with and without 1-MCP and shipped via standard methods and environmental conditions.1-MCP significantly reduced leaf senescence in propagation following shipping on all cultivars that were susceptible to leaf senescence.Resistant cultivars displayed little leaf senescence despite being exposed to similar ethylene concentrations as the susceptible cultivars.Therefore, 1-MCP provides a viable means of reducing leaf senescence of unrooted poinsettia cuttings following shipping at non-optimal temperatures.