Physiological and biochemical bases of flower opening and senescence in Rosa hybrida cv. Mercedes
1994
Brena, S.R.
Experiments were conducted to assess the effect of various duration of water stress and STS [silver thiosulfate]-pulsing after water stress on the physical, biochemical, and physiological changes in Rosa hybrida cv. 'Mercedes'. Regardless of the water stress duration, flowers held in 8-HQC [Hydroxyquinoline citrate] lasted twice as long as those held in distilled water only. After 10 days at 20 deg C, flowers soaked indistilled water after 12 hrs of water stress had the lowest quality rating which also failed to open completely. STS-pulsed flowers held in 8-HQC opened completely and had longer vase life over those STS-pulsed but held in distilled water. Flower opening in STS-pulsed roses held in 8-HQC was almost complete after 6 days at 20 deg C. It took 4 more days before STS-pulsed flowers soaked in distilled water immediately after harvest and those water stressed for 4 hours to attain flower opening similar to those subjected to the same treatments but subsequently held in 8-HQC. Carbohydrate and protein levels remained significantly higher in flowers held in 8-HQC or without STS-pulsing than flowers held in distilled water. Ion leakage remained relatively higher in flowers water-stressed for 12 hours than those soaked in distilled water. Respiration rate of flowers with or without STS-pulsing was higher in soaked in 8-HQC than in distilled water
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