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In order to verify the effects of ethionine in preservative solution on the physiological changes of petals during vaselife of cut rose (cv. Red Sandra), the properties of cell sap such as pH, EC, conductivity, and osmolarity in petals in addition to parameters which are related to water status were temporally investigated using cut flowers maintained in the preservative solution such as basal medium (BS, 2% sucrose + 200 ppm 8HQS), SONK1 solution (BS + 0.1 mM ethionine), Chrysal Professional, or in the distilled water only. Vaselife of cut flowers maintained in distilled water, BS, and SONK1 solution were 5.3, 11.6, 15.4 days, respectively. SONK1 solution containing ethionine was found to be very effective on the maintenance of constant fresh weight, solution uptake, water potential, and petal´s color as compared to other treatments. On the other hand, SONK1 and BS showed similar patterns in the temporal changes of pH and EC of cell sap of petals. However, it was found that SONK1 less increased osmolarity with dully slope and more markedly reduced flavonoid content from the 9 and 11 day, respectively, after experiment than BS. Therefore, it was speculated that ethionine influenced indirectly to the physiological changes of petal´s cell and have a synergistic effect with sucrose.
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