|Title||Over de houdbaarheid van snijbloemen|
|Source||University. Promotor(en): S.J. Wellensiek. - Wageningen : Veenman - 62|
|Publication type||Dissertation, internally prepared|
|Keyword(s)||snijbloemen - houdbaarheid (kwaliteit) - cut flowers - keeping quality|
|Abstract||Having established that cut flowers last longer by adding such solutions as sugars, bactericides or acids to the vase water, their mechanism of action was investigated.
Bacteria and fungi had a direct plugging effect, but also acted indirectly on the water conduction of the flower stalk by secreting toxins. A third kind of plugging occurred independent of micro-organisms as a reaction to wounding and intrusion of air. This plugging could be limited by reducing 02 concentration, lowering the pH and by adding Ca(N0 3 ) 2 .
The addition of sugar prevented disintegration of cells through lack of respiratory substrate. In times of higher respiratory activity of the flower parts, the optimum sugar concentration needed in the water increased.
Attempts to decrease respiratory activity of the flower by adding respiratory inhibitors failed. Only in Matthiola could the respiratory activity be decreased by gibberellic acid; at the same time the flowers lasted longer.
Boron had a favourable effect in Convallaria, Dianthus, Lathyrus and Syringa. Its addition decreased the optimum sugar concentration. In Dianthus it acted on the distribution of dry matter within the flower during development.
The possibilities were discussed of practical application of chemicals to make cut flowers last longer.