Postproduction Performance of Potted Rose under Simulated Transport and Low Irradiance Levels

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  • 1 Environmental Horticulture Department, University of Florida, Gainesville, FL 32611
  • | 2 Proefstation Voor de Bloemisterij, Aalsmeer, The Netherlands

Miniature flowering potted `Orange Rosamini' rose plants (Rosa × hybrida) were placed directly from production into simulated transport (STR) for 3 days at 5C and then into a retail handling treatment for 0, 1, 2, or 4 days. In the retail handling treatment, plants placed at 1 W·m-2 were then moved into a final postproduction irradiance level of 4 W·m-2; plants placed at 4 W·m-2 were then moved into a final postproduction irradiance level of 1 W·m-2. Also, a no-STR control treatment, plants placed directly into final postproduction environment (no transport or retail handling treatment), was included. All plants were placed into a final postproduction irradiance level (1 or 4 W·m-2) for 3 weeks to evaluate the effects of postproduction irradiance. The retail handling and postproduction environments were maintained at 20 ± 1C, 1 or 4 W·m-2 of irradiance (12 hours daily) from cool-white fluorescent lamps, and relative humidity (RR) of 60% ± 5% to simulate retail and/or consumer home conditions. Little difference was observed due to retail handling treatment or postproduction irradiance after 1 week. At weeks 2 and 3 of postproduction, there were 40% to 50% more open flowers on the no-STR plants maintained at 4 W·m-2 than on those maintained at 1 W·m-2 or on STR plants maintained at 1 or 4 W·m-2 postproduction irradiance. At week 3 of postproduction, plants with STR maintained at 1 W·m-2 had no buds showing color, while those maintained at 4 W·m-2 had three to five buds showing color. However, the no-STR control plants had one bud showing color at week 3, regardless of postproduction irradiance level. These results indicate that the detrimental effects of transport, i.e., bud drop, likely can be minimized by high postproduction irradiance levels following transport.

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