Studies On The Postharvest Physiology Of Cut Lily Flowers

Changes of some physiological indexes including PME, PG, pectin, sugar and protective enzymes (superoxide dismutase and peroxidase) during cut lily flowers postharvest senescence under various treatments(STS, ethylene) were preliminarily studied.The relations between the physiological indexes and flowers senescence were discussed. The results were as follow:1 .The moisture contents in top and mid-petal (L. ×L.formolongi Hort.) rose first and then decreased, but the latter decreased more slowly; and its contents in leaf rose at 2th day, then decreased rapidly; its contents in petal was not distinctly effected by STS, but the moisture contents of leaf decreased soon with the treatment of STS; however, the treatment of ethylene led to the decrease of moisture contents in petal. The moisture contents in petal and leaf of Siberia all decreased and its changes in leaf was evident. Water loss was the main reason of cut flower senescence.2. The cells in abscission zone arranged in the form of rectangle and were smaller than the rest of others.3. Eth accelerated the senescence of cut flowers. The soluble protein contents in petal treated with Eth decreased fast, this led to the rapid decrease of soluble sugar ,and the swift increase of water-soluble pectin .protopectin and total pectin, the activities of PME in basal petal rose as well.4. With delay of vase holding, the activities of POD in top and mid-petal(L. ×L.formolongi Hort) rose, but the top part rose more...