Effects of preservative solutions on physiological senescence responses of cut rose according to cultivars

摘要

Effects of preservative solutions on the patterns of physiological senescence and ethylene evolution in rose cultivars (Rosa hybrida 'Red Sandra' and 'Rote Rose') were investigated by using DW (distilled water), BS (2 percent sucrose + 200 ppm 8-hydroxyquinoline sulfate), or SONK1 (BS + 0.1 mM ethionine) solution as a preservative solution. Water balance of 'Red Sandra' showed the first minus value at 3 days in DW treatment, and 5.5 and 6.8 days in BS and SONK1 solution, respectively. In 'Rote Rose', fresh weight decreased after 3 days in all treatments, especially showing dramatic decrease in BS and SONK1 treatments. Also, water balance of BS treatment showed the first minus value at 2 days, and 2.3 and 2.5 days in SONK1 and DW treatment, respectively. In ethylene production of cut rose, 'Red Sandra' in DW treatment did not show any peak or dramatic rise through the whole vase life, whereas those under BS or SONK1 solution showed a peak with about 3 nL centre dot g~(-1) centre dot h~(-1) duringdays from 7 to 9. Although all treatments of 'Rote Rose' showed ethylene peak, the levels of ethylene evolution were about half of those of 'Red Sandra' maintained in BS or SONK1 solution. It was also found in 'Rote Rose' that the time of ethylene peak occurred after the full opening of rose flower and the flower opening was continuously maintained even after the decrease of ethylene evolution. According to the Hgnin distribution of neck-part of stem, the wide stained area as pink color in the stem of 'Red Sandra' treated with SONK1 solution was observed under a light microscopy. In 'Rote Rose', however, no stained area was found in any treatment.