Effect of temperature, carbon dioxide and ethylene on quality of Dendrobium spp. cut flowers
1989
Jongwattana Pumhirun
Pompadour was stored well for 7 days at 10 and 13 deg C and had a vase-life of 4-5 days while Walter Oumae was stored at 10 deg C for 7 days and had 2 days vase-life. Chilling injury symptom appeared in flowers which were stored at lower temperature. Under 10 and 20 % CO2 concentration for 4 days at 25 deg C florets of tight buds and full bloom of Pompadour and Walter Oumae had better condition than the control but there was tendency to decrease bud opening. Higher CO2 concentrations were toxic to floral tissue. Pompadour became of blue or dark color, then brown and faded while Walter Oumae turned to brown and dark color. Pompadour flowers were exposed to 2.5 ppm C2H4 for 36 hours, they exhibited sleepiness symptom. Younger florets were more susceptible than older ones. If C2H4 concentration was increased to 32 ppm, flowers dropped and dropped. After pulsing cut orchids and stored for 7 days in water or holding solutions at 10 deg C, all treatments were not better than control. However Pompadour and Walter Oumae stored only in water and enclosed with ethylene absorbent (EA) had 2-2.6 and 1.0 day longer vase-life than the control. C2H4 concentration of Pompadour and Walter Oumae with EA was 0.005-0.025 and 0.005-0.010 ppm while that of controls was about 3.6-7.0 and 14-15 times higher respectively.
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