Abstract—Phaleonopsis cut orchids were pretreated for 6 hours at 25 °C with or without 1-MCP. Treated cut orchids were exposed to 800 ppm of 1- methylcyclopropane (1-MCP). Then, all cut flowers were treated with ethylene for 15 hours and after that were held in flask containing flower food individually at 25 °C to follow abscission. It was observed that, 20–30% of the floral buds and flowers abscised within 4 days in untreated sample. However, in treated sample, the 1-MCP pretreatment reduced the bud and petal abscission and the cut orchids were still maintained acceptable until day 7 before starting to abscise between 10-14 days of storage period. Result also showed that the ethylene production was inhibited and ACC oxidase activity was decreased in samples treated with 1-MCP. Thus, 1-MCP pretreatments prolong the shelf life of cut orchids from 4 days in control up to 10 days in treated samples, both displayed in 25 °C.
Keywords—ornamental, ACC oxidase activity, ethylene production, quality, shelf life.
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