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Plant and Cell Physiology, 1985, Vol. 26, No. 5 829-837
© 1985

Article

Mitochondrial Changes in Harvested Carnation Flowers (Dianthus caryophyllus L.) during Senescence

Barry A. Eisenberg1 and George L. Staby2

1 Department of Horticulture, University of Illinois 1107 West Dorner Dr., Urbana, IL, U.S.A. 618014778
2 Perishables Research Organization P.O. Box 2227, Novato, CA, U.S.A. 94947

Harvested carnation (Dianthus caryophyllus L.) flowers were placed in either a preservative solution or deionized water and monitored through senescence during which time flower fresh weight was measured as well as production of ethylene and CO2. Flower fresh weight, ethylene, and CO2 levels increased as the flowers aged, but fresh weight and CO2 levels fell once flowers began to senesce regardless of holding solution. Preservative-treated flowers senesced at a slower rate than deionized water-treated flowers. The amount of ADP phosphorylated to ATP per oxygen atom consumed, using mitochondria isolated from petal tissue provided with either succinate or malate as substrates, was found to increase as flowers senesced and then to decrease in the later stages of senescence. Respiratory control ratios with succinate as the substrate did not change appreciably until the final stages of senescence white respiratory control values using malate showed greater variation but no consistent pattern relative to the progress of senescence. Cyanide-resistant respiration was noted with isolated mitochondria oxidizing either substrate, but no correlation between cyanide-resistant respiration and senescence could be found.

(Received July 10, 1984; Accepted April 16, 1985)
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