The effects of the treatment concentration and time of 1-methylcyclopropene (1-MCP) to the postharvest cut Dendrobium 'Sonia' orchid
The plant growth regulator 1-methylcyclopropene (1-MCP) is capable of inhibiting the formation of endogenous ethylene and reducing its effects on cut flowers. This study evaluated 1-MCP concentration range and time treatment on the vase life and postharvest quality of cut Dendrobium Sonia orchid. Cut D. Sonia orchid was treated at 1-MCP concentration of 0.1, 0.2, 0.3 and 0.4 µL L-1 and duration exposure of 0, 2, 4, 6 and 8 h. Cut D. Sonia orchid in treatments was stored at 25°C, RH 80±5%. Cut D. Sonia orchid with no 1-MCP treatment was used as the control. Results indicated that the treatment with 1-MCP (0.2 µL L-1, 6 h) produced the best outcome. The cut D. Sonia orchid in this treatment reached a vase life of 32 days (12 days more than the control), the flowers were fresh, not wilted, and there was no abscission. In contrast, for the control orchid there was over 50% flower abscission, wilted flowers and blackened stubs. The abscission rate for the treated orchid after 30 days storage was about 38% as compared to the control (85%). Ethylene production and respiration rate in this treatment against storage times were reduced as compared to other treatments and the control. The maximum value of ethylene (3.25 nL g-1 h-1) was recorded at the second day of storage; however, for respiration rate, the maximum value (5.20 mg CO2 g-1 h-1) was at the first day of storage. At 30 days of storage, anthocyanin and chlorophyll concentrations in this treatment were reduced 33 and 32% as compared to the control (52 and 42%). The intensity of ethylene production in 1-MCP treatment was 3.25 nL g-1 h-1 and 5.20 mg CO2-1 g-1 h-1 as compared to the control (4.5 nL g-1 h-1 and 7.75 mg CO2-1 g-1 h-1).
Le, Si Ngoc, Nguyen, N.V Phong and Nguyen, Thuy Trang (2018). The effects of the treatment concentration and time of 1-methylcyclopropene (1-MCP) to the postharvest cut Dendrobium 'Sonia' orchid. Acta Hortic. 1213, 587-598
1-MCP, cut Dendrobium 'Sonia' orchid, ethylene, postharvest storage