THE VALUE OF IMPREGNATING CUT STEMS WITH HIGH CONCENTRATIONS OF SILVER NITRATE

A.M. Kofranek, J.L. Paul
A major cause of poor keeping quality of many cut flowers is due to the plugging of the vascular tissue by bacteria. Silver in flower preservative solutions has been shown to be effective for extending flower lonevity. Treating cut flower stems by immersion in concentrated silver nitrate solutions has extended the vase life of carnations and chrysanthemums in our studies. Effective impregnation of cut stems is accomplished by immersion for 10 minutes in a 1000 ppm AgNO3 solution. The upward movement of silver in the xylem tissue of chrysanthemum ranged between 4 and 6 mm per hour depending on the stress history of the cut flowers. The effect of pre-treatment on gladiolus stems increases the percentage of florets which open; with gerbera a silver pretreatment was only marginally beneficial.

The effectiveness of the silver impregnation in part depended on the sugar status of the plant. For carnations, introducing sugar into the solution, after stems had been impregnated with silver, just prior to or during the longevity studies enhanced the cut flower life. Tight carnation buds were opened in 10% sucrose after impregnating the stems for 1 hour in a 1000 ppm AgNO3 solution.

Kofranek, A.M. and Paul, J.L. (1975). THE VALUE OF IMPREGNATING CUT STEMS WITH HIGH CONCENTRATIONS OF SILVER NITRATE. Acta Hortic. 41, 199-206
DOI: 10.17660/ActaHortic.1975.41.17
https://doi.org/10.17660/ActaHortic.1975.41.17

Acta Horticulturae