ISHS Acta Horticulturae 768: XXVII International Horticultural Congress - IHC2006: International Symposium on The Role of Postharvest Technology in the Globalisation of Horticulture
ETHYLENE BIOSYNTHESIS AND MEMBRANE MICROVISCOSITY CHANGES OF CUT ROSE ROSA HYBRIDA L. 'NOBLESSE' BY CALCIUM CHLORIDE PULSE AND DRY COLD STORAGE |
| Authors: | Ruey-Song Lin, May-Hsiu Kuo |
| Keywords: | cut rose, cold storage, ethylene biosynthesis, membrane microviscosity, calcium chloride |
| Abstract:
Pulsing cut rose Rosa hybrida L. ‘Noblesse’ with 10 mM proline and 10 mM CaCl2 enhanced water uptake capability and promoted flower opening after cold storage. Cut roses in cold storage showed changes in membrane characteristics, increased ethylene production and electrolyte leakage. ACO activity was inhibited in flowers pulsed with CaCl2 at 10 mM and thus ethylene production was reduced, and membrane microviscosity was less than in control flowers during vase life of cut roses. Nevertheless, post cold storage, ACC accumulated in petals and large amounts of ethylene was produced having an earlier peak of ethylene production than controls. At 8°C ethylene production peaked at 1.34 nl/g/h on the third day in the vase. At 8°C cut flowers suffered low temperature stress that affected membrane properties. Once flowers were rewarmed, microviscosity returned to 2.24 poise, similar to controls at the fully open stage. The cortex and the pith cells of pedicel tissue after 8°C storage were deformed as a result of water loss. | |
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