Effects of Simulated Shipping Conditions on Physiology and Post-shipping Performance in Phalaenopsis
Date Issued
2008
Date
2008
Author(s)
Hou, Jiuun-Yan
Abstract
In order to realize how long-distance shipping affects physiological status in Phalaenopsis, changes of net CO2 uptake, photosystem II efficiency, and carbohydrates after a long-term simulated dark shipping were determined. Effects of potted and bare-rooted treatment, storage temperature (15, 20, and 25 oC), low-temperature acclimatization (day/night 25/20 oC for 10 days) before simulated dark shipping, and light acclimatization ( 34, 72, 140, 200, and 399 μmol•m-2•s-1 ) after shipping on post-shipping performance with regards to the above photosynthetic parameters were then further investigated. Effect of temperature on 1-methylcyclopropene (1-MCP) residual protection on Phalaenopsis flowers was also studied.et CO2 uptake, malate concentration, titratable acidity concentration in potted Phal. Sogo Yukidian ‘V3’ decreased after a 21-day simulated dark shipping at 20 oC, but recovered gradually with time after shipping. It took three to nine days to recover. Fv/Fm was little affected by shipping. Thereby, net CO2 uptake would be a better indicator for estimating recovery time after shipping. Fresh weight loss, leaf ABA concentration, yellowed leaf number, and CO2 production during daytime of bare-rooted plants were higher than that of potted plants, and increased with increasing shipping duration ( 7, 14, and 21 days). ABA concentration of leaf rose in first 3-day after simulated dark shipping and then decreased within next 3-8 days. Plants shipped at 25 oC resulted in more yellowed leaves, and lower Fv/Fm. Low-temperature acclimatization reduced chilling injury in Phal. after shipping at 15 ℃. Light intensity at 399 μmol•m-2•s-1 after shipping resulted in lower PS II efficiency and net CO2 uptake rate. It was recommended to have a gradient light increase ( 34 - 72 - 140 - 200 μmol•m-2•s-1 ) or maintain a 140 μmol•m-2•s-1 light level after shipping for Phalaenopsis to achieve a better photosynthetic rate.tarch was higher in shoot than that in roots before simulated dark shipping, and higher total soluble sugar was found in roots than that in shoot. Soluble sugars in both shoot and roots decreased with increasing duration of simulated dark shipping (0, 10, 20, 30, and 40 days), and decreased more significantly in roots than that in shoot. Starch decreased significantly in both shoot and roots 10 days after shipping and maintained steady from 10 to 40 days after shipping. After simulated dark shipping at 15 oC, the sucrose concentration in shoot, glucose, fructose and total soluble sugar concentrations in roots were higher comparing with other shipping temperature treatments. Better plant performance after shipping was obtained with shipping temperature at 20 oC, regardless of low-temperature acclimatization.-Methylcyclopropene was able to protect flowers of Phal. amabilis against ethylene injury, but the residual effect depended on post-treatment temperature. The duration of 1-MCP residual protection on flowers at day/night temperature of 25/20 oC, 20/15 oC, and 15/13 oC was 4-8, 10-13, and 13-17 days, respectively. Higher temperature after 1-MCP application resulted in a reduced residual protection in Phalaenopsis.
Subjects
Dark
Carbohydrate
Light intesnsity
Temperature
Acclimatization
Type
thesis
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