The influence of sucrose ethanol and calcium nitrate on the freezing point and long term low temperature storage of carnation dianthus caryophyllus flowers

Heins, R.D.; Howell, G.S.; Wilkins, H.R.

Scientia Horticulturae 14(3): 269-276

1981


ISSN/ISBN: 0304-4238
Accession: 006700840

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Abstract
Both tight bud and open carnation (D. caryophyllus L.) flowers survived -4.degree. C for 5 days without injury if flowers were pulsed with 20% sucrose at 25.degree. C for 24 h prior to storage. Between the 8th and 10th day of storage, both stem and floral tissue froze. Flowers pulsed with 10 or 20% ethanol for 24 h at 25.degree. C survived -2.degree. C for 5 days, while those pulsed in water failed to open normally or were frozen when stored at 0.degree. C for 5 days. Flowers stressed (wilted) for 24 h at 25.degree. C survived for only 5 days at -4.degree. C. After pulsing, tight buds were more resistant to freezing than open flowers and stem tissue was more resistant than petal tissues. During storage stem tissue froze before petal tissue. Using exotherm analysis, petal tissue froze at -2.3 or -4.7.degree. C when first pulsed with water or sucrose and at -3.0 and -3.8.degree. C after 7 days.