The Effect of Inorganic Salts on the Senescence of Dianthus caryophyllus Flowers

Certain inorganic salts like KNO 3 , KCl, K 2 SO 4 , Ca(NO 3 ) 2 and NH 4 NO 3 extend longevity of cut carnation flowers. The effect of KNO 3 was studied in some detail. There is an osmotic adjustment in response to KNO 3 treatment. The osmotic concentration change occurred in the external as well as in the internal compartments. The osmotic concentration change in the external compartment is well correlated with extension of longevity. The effect of KNO 3 on the sensitivity to ethylene, and its significance in delaying senescence is discussed.