Abstract
Abstract Vase-life of roses (Rosa hybrida L. cv. Forever Yours) placed in the modified Cornell Solution (2% sucrose + 200 mg 8-hydroxyquinoline sulfate/liter) was increased over distilled water by nearly a week. Petal sugars decreased only slightly in roses maintained in distilled water but a rapid decline of respiratory control (RC) of mitochondria occurred after 3 days and was finally lost as vase-life ended. However, petal sugars nearly doubled in flowers in the preservative and the decline in RC of mitochondria occurred at a gradual rate and was never lost. The data indicate that the end of vase-life and the decline in respiration during rose flower senescence is not due to substrate limitations, but to the inability of the mitochondria to utilize the substrate. Exogenous sugars seem to be maintaining mitochondrial structure and function rather than providing substrates.
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