Effects of Micro-environment Modified Atmosphere Package on Postharvest Senescence and Defense Enzymes of Lanzhou Lily

The effects of different packing methods on the postharvest aging process and enzymatic defense system of lily were studied with Lanzhou lily as test material. The air conditioning box without air conditioning element was treated as CK, the vacuum packing treatment and the air conditioning box with air conditioning element was treated as microenvironment modified at moshpere package(mMAP). The sensory quality, physiology, aging and the indexes of many defense enzymes of lily were detected. The results showed that at the early stage of storage, the vacuum-packed lily had higher reducing sugar content and firmness, in contrast to CK, had higher soluble protein content, but with the extension of the storage period, the sensory score decreased rapidly, the ethylene generation rate increased, the membrane oxidation degree intensified, the enzymatic defense ability decreased, and the quality gradually deteriorated. The lily treated with mMAP had the highest sensory score during storage, and soluble protein at a higher level. The reducing sugar was accumulated at the later stage of storage, the respiration intensity and ethylene production rate were lower than that of vacuum packing, which inhibited the increase of MDA (P<0.05) and POD activity, and at the same time improved the activites of SOD, APX and CAT, compared with the vacuum packaging to promote the body defense ability. In conclusion, mMAP has the best sensory performance and physiological quality, which can delay the aging process and improve the enzymec defense system of lily to a certain extent.