Abstract
When cabbage plug seedlings were stored under a modified atmosphere packaging (MAP) at 15°C in the dark for 2 weeks, a passive MAP did not create an environment to inhibit stem elongation of seedling in the 0.1mm thick polyethylene (PE) film pouch. An active MAP by adjusting N2 rich air with 2% O2 did not successfully retard elongation either. In the active MAP where the internal atmosphere was replaced with N2 enriched air (2.5% O2) with elevated CO2, the elongation was delayed as CO2 concentration increased. When 16% CO2 was introduced to the 0.08mm thick nylon/PE film pouch, the inhibit of stem elongation was most successful. Analysis of plant weight, total number of leaves, green color intensity, ascorbic acid content in the leaf blade and head weight of harvested cabbage revealed that the elevated CO2 active MAP is a favorable storage condition for cabbage plug seedlings. The elevated CO2 active MAP, however, caused CO2 injury when CO2 concentration exceeded 24%.
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