| 'Royalty' roses were grown in a greenhouse under different high intensity supplementary irradiation (HISI) regimes. The leaf water potential (Y;Pn increased linearly with E and g;A lower light compensation point of 18 ;Increases in Pn resulted in increased leaf total soluble carbohydrates (TSC) which was correlated highly with Q. The longer the photoperiod, the higher the TSC. Sucrose and sorbitol were most abundant and comprised 22-43% or 31-32% respectively of TSC depending on time of day, year and light regime.;Cut roses placed in full (FSF) or half (HSF) recommended strength Floralife solution showed leaf brittleness with negative Pn and unpleasant odor, but limited "bent neck" stems. While no brittle leaves or unpleasant odor occurred on roses placed in DW, several "bent neck" stems and higher Pn were observed on roses placed in DW. |
